IOUtils (CommonsIO API)

java.lang.Object
- org.apache.commons.io.IOUtils

```
public class IOUtils
extends Object
```
General IO stream manipulation utilities.
This class provides static utility methods for input/output operations.
- closeQuietly - these methods close a stream ignoring nulls and exceptions
- toXxx/read - these methods read data from a stream
- write - these methods write data to a stream
- copy - these methods copy all the data from one stream to another
- contentEquals - these methods compare the content of two streams
The byte-to-char methods and char-to-byte methods involve a conversion step. Two methods are provided in each case, one that uses the platform default encoding and the other which allows you to specify an encoding. You are encouraged to always specify an encoding because relying on the platform default can lead to unexpected results, for example when moving from development to production.
All the methods in this class that read a stream are buffered internally. This means that there is no cause to use a BufferedInputStream or BufferedReader. The default buffer size of 4K has been shown to be efficient in tests.
The various copy methods all delegate the actual copying to one of the following methods:
For example, copy(InputStream, OutputStream) calls copyLarge(InputStream, OutputStream) which calls copy(InputStream, OutputStream, int) which creates the buffer and calls copyLarge(InputStream, OutputStream, byte[]).
Applications can re-use buffers by using the underlying methods directly. This may improve performance for applications that need to do a lot of copying.
Wherever possible, the methods in this class do not flush or close the stream. This is to avoid making non-portable assumptions about the streams' origin and further use. Thus the caller is still responsible for closing streams after use.
Origin of code: Excalibur.

字段概要

字段
限定符和类型	字段和说明
`static char`	`DIR_SEPARATOR` The system directory separator character.
`static char`	`DIR_SEPARATOR_UNIX` The Unix directory separator character.
`static char`	`DIR_SEPARATOR_WINDOWS` The Windows directory separator character.
`static int`	`EOF` Represents the end-of-file (or stream).
`static String`	`LINE_SEPARATOR` The system line separator string.
`static String`	`LINE_SEPARATOR_UNIX` The Unix line separator string.
`static String`	`LINE_SEPARATOR_WINDOWS` The Windows line separator string.

构造器概要

构造器
构造器和说明

IOUtils()
Instances should NOT be constructed in standard programming.

构造器
构造器和说明
`IOUtils()` Instances should NOT be constructed in standard programming.

方法概要

所有方法静态方法具体方法已过时的方法
限定符和类型	方法和说明
`static BufferedInputStream`	`buffer(InputStream inputStream)` Returns the given InputStream if it is already a `BufferedInputStream`, otherwise creates a BufferedInputStream from the given InputStream.
`static BufferedInputStream`	`buffer(InputStream inputStream, int size)` Returns the given InputStream if it is already a `BufferedInputStream`, otherwise creates a BufferedInputStream from the given InputStream.
`static BufferedOutputStream`	`buffer(OutputStream outputStream)` Returns the given OutputStream if it is already a `BufferedOutputStream`, otherwise creates a BufferedOutputStream from the given OutputStream.
`static BufferedOutputStream`	`buffer(OutputStream outputStream, int size)` Returns the given OutputStream if it is already a `BufferedOutputStream`, otherwise creates a BufferedOutputStream from the given OutputStream.
`static BufferedReader`	`buffer(Reader reader)` Returns the given reader if it is already a `BufferedReader`, otherwise creates a BufferedReader from the given reader.
`static BufferedReader`	`buffer(Reader reader, int size)` Returns the given reader if it is already a `BufferedReader`, otherwise creates a BufferedReader from the given reader.
`static BufferedWriter`	`buffer(Writer writer)` Returns the given Writer if it is already a `BufferedWriter`, otherwise creates a BufferedWriter from the given Writer.
`static BufferedWriter`	`buffer(Writer writer, int size)` Returns the given Writer if it is already a `BufferedWriter`, otherwise creates a BufferedWriter from the given Writer.
`static void`	`close(URLConnection conn)` Closes a URLConnection.
`static void`	`closeQuietly(Closeable... closeables)` Closes a `Closeable` unconditionally.
`static void`	`closeQuietly(Closeable closeable)` Closes a `Closeable` unconditionally.
`static void`	`closeQuietly(InputStream input)` Closes an `InputStream` unconditionally.
`static void`	`closeQuietly(OutputStream output)` Closes an `OutputStream` unconditionally.
`static void`	`closeQuietly(Reader input)` Closes an `Reader` unconditionally.
`static void`	`closeQuietly(Selector selector)` Closes a `Selector` unconditionally.
`static void`	`closeQuietly(ServerSocket sock)` Closes a `ServerSocket` unconditionally.
`static void`	`closeQuietly(Socket sock)` Closes a `Socket` unconditionally.
`static void`	`closeQuietly(Writer output)` Closes an `Writer` unconditionally.
`static boolean`	`contentEquals(InputStream input1, InputStream input2)` Compares the contents of two Streams to determine if they are equal or not.
`static boolean`	`contentEquals(Reader input1, Reader input2)` Compares the contents of two Readers to determine if they are equal or not.
`static boolean`	`contentEqualsIgnoreEOL(Reader input1, Reader input2)` Compares the contents of two Readers to determine if they are equal or not, ignoring EOL characters.
`static int`	`copy(InputStream input, OutputStream output)` Copies bytes from an `InputStream` to an `OutputStream`.
`static long`	`copy(InputStream input, OutputStream output, int bufferSize)` Copies bytes from an `InputStream` to an `OutputStream` using an internal buffer of the given size.
`static void`	`copy(InputStream input, Writer output)` 已过时。 2.5 use `copy(InputStream, Writer, Charset)` instead
`static void`	`copy(InputStream input, Writer output, Charset inputEncoding)` Copies bytes from an `InputStream` to chars on a `Writer` using the specified character encoding.
`static void`	`copy(InputStream input, Writer output, String inputEncoding)` Copies bytes from an `InputStream` to chars on a `Writer` using the specified character encoding.
`static void`	`copy(Reader input, OutputStream output)` 已过时。 2.5 use `copy(Reader, OutputStream, Charset)` instead
`static void`	`copy(Reader input, OutputStream output, Charset outputEncoding)` Copies chars from a `Reader` to bytes on an `OutputStream` using the specified character encoding, and calling flush.
`static void`	`copy(Reader input, OutputStream output, String outputEncoding)` Copies chars from a `Reader` to bytes on an `OutputStream` using the specified character encoding, and calling flush.
`static int`	`copy(Reader input, Writer output)` Copies chars from a `Reader` to a `Writer`.
`static long`	`copyLarge(InputStream input, OutputStream output)` Copies bytes from a large (over 2GB) `InputStream` to an `OutputStream`.
`static long`	`copyLarge(InputStream input, OutputStream output, byte[] buffer)` Copies bytes from a large (over 2GB) `InputStream` to an `OutputStream`.
`static long`	`copyLarge(InputStream input, OutputStream output, long inputOffset, long length)` Copies some or all bytes from a large (over 2GB) `InputStream` to an `OutputStream`, optionally skipping input bytes.
`static long`	`copyLarge(InputStream input, OutputStream output, long inputOffset, long length, byte[] buffer)` Copies some or all bytes from a large (over 2GB) `InputStream` to an `OutputStream`, optionally skipping input bytes.
`static long`	`copyLarge(Reader input, Writer output)` Copies chars from a large (over 2GB) `Reader` to a `Writer`.
`static long`	`copyLarge(Reader input, Writer output, char[] buffer)` Copies chars from a large (over 2GB) `Reader` to a `Writer`.
`static long`	`copyLarge(Reader input, Writer output, long inputOffset, long length)` Copies some or all chars from a large (over 2GB) `InputStream` to an `OutputStream`, optionally skipping input chars.
`static long`	`copyLarge(Reader input, Writer output, long inputOffset, long length, char[] buffer)` Copies some or all chars from a large (over 2GB) `InputStream` to an `OutputStream`, optionally skipping input chars.
`static LineIterator`	`lineIterator(InputStream input, Charset encoding)` Returns an Iterator for the lines in an `InputStream`, using the character encoding specified (or default encoding if null).
`static LineIterator`	`lineIterator(InputStream input, String encoding)` Returns an Iterator for the lines in an `InputStream`, using the character encoding specified (or default encoding if null).
`static LineIterator`	`lineIterator(Reader reader)` Returns an Iterator for the lines in a `Reader`.
`static int`	`read(InputStream input, byte[] buffer)` Reads bytes from an input stream.
`static int`	`read(InputStream input, byte[] buffer, int offset, int length)` Reads bytes from an input stream.
`static int`	`read(ReadableByteChannel input, ByteBuffer buffer)` Reads bytes from a ReadableByteChannel.
`static int`	`read(Reader input, char[] buffer)` Reads characters from an input character stream.
`static int`	`read(Reader input, char[] buffer, int offset, int length)` Reads characters from an input character stream.
`static void`	`readFully(InputStream input, byte[] buffer)` Reads the requested number of bytes or fail if there are not enough left.
`static void`	`readFully(InputStream input, byte[] buffer, int offset, int length)` Reads the requested number of bytes or fail if there are not enough left.
`static byte[]`	`readFully(InputStream input, int length)` Reads the requested number of bytes or fail if there are not enough left.
`static void`	`readFully(ReadableByteChannel input, ByteBuffer buffer)` Reads the requested number of bytes or fail if there are not enough left.
`static void`	`readFully(Reader input, char[] buffer)` Reads the requested number of characters or fail if there are not enough left.
`static void`	`readFully(Reader input, char[] buffer, int offset, int length)` Reads the requested number of characters or fail if there are not enough left.
`static List<String>`	`readLines(InputStream input)` 已过时。 2.5 use `readLines(InputStream, Charset)` instead
`static List<String>`	`readLines(InputStream input, Charset encoding)` Gets the contents of an `InputStream` as a list of Strings, one entry per line, using the specified character encoding.
`static List<String>`	`readLines(InputStream input, String encoding)` Gets the contents of an `InputStream` as a list of Strings, one entry per line, using the specified character encoding.
`static List<String>`	`readLines(Reader input)` Gets the contents of a `Reader` as a list of Strings, one entry per line.
`static long`	`skip(InputStream input, long toSkip)` Skips bytes from an input byte stream.
`static long`	`skip(ReadableByteChannel input, long toSkip)` Skips bytes from a ReadableByteChannel.
`static long`	`skip(Reader input, long toSkip)` Skips characters from an input character stream.
`static void`	`skipFully(InputStream input, long toSkip)` Skips the requested number of bytes or fail if there are not enough left.
`static void`	`skipFully(ReadableByteChannel input, long toSkip)` Skips the requested number of bytes or fail if there are not enough left.
`static void`	`skipFully(Reader input, long toSkip)` Skips the requested number of characters or fail if there are not enough left.
`static InputStream`	`toBufferedInputStream(InputStream input)` Fetches entire contents of an `InputStream` and represent same data as result InputStream.
`static InputStream`	`toBufferedInputStream(InputStream input, int size)` Fetches entire contents of an `InputStream` and represent same data as result InputStream.
`static BufferedReader`	`toBufferedReader(Reader reader)` Returns the given reader if it is a `BufferedReader`, otherwise creates a BufferedReader from the given reader.
`static BufferedReader`	`toBufferedReader(Reader reader, int size)` Returns the given reader if it is a `BufferedReader`, otherwise creates a BufferedReader from the given reader.
`static byte[]`	`toByteArray(InputStream input)` Gets the contents of an `InputStream` as a `byte[]`.
`static byte[]`	`toByteArray(InputStream input, int size)` Gets the contents of an `InputStream` as a `byte[]`.
`static byte[]`	`toByteArray(InputStream input, long size)` Gets contents of an `InputStream` as a `byte[]`.
`static byte[]`	`toByteArray(Reader input)` 已过时。 2.5 use `toByteArray(Reader, Charset)` instead
`static byte[]`	`toByteArray(Reader input, Charset encoding)` Gets the contents of a `Reader` as a `byte[]` using the specified character encoding.
`static byte[]`	`toByteArray(Reader input, String encoding)` Gets the contents of a `Reader` as a `byte[]` using the specified character encoding.
`static byte[]`	`toByteArray(String input)` 已过时。 2.5 Use `String.getBytes()` instead
`static byte[]`	`toByteArray(URI uri)` Gets the contents of a `URI` as a `byte[]`.
`static byte[]`	`toByteArray(URL url)` Gets the contents of a `URL` as a `byte[]`.
`static byte[]`	`toByteArray(URLConnection urlConn)` Gets the contents of a `URLConnection` as a `byte[]`.
`static char[]`	`toCharArray(InputStream is)` 已过时。 2.5 use `toCharArray(InputStream, Charset)` instead
`static char[]`	`toCharArray(InputStream is, Charset encoding)` Gets the contents of an `InputStream` as a character array using the specified character encoding.
`static char[]`	`toCharArray(InputStream is, String encoding)` Gets the contents of an `InputStream` as a character array using the specified character encoding.
`static char[]`	`toCharArray(Reader input)` Gets the contents of a `Reader` as a character array.
`static InputStream`	`toInputStream(CharSequence input)` 已过时。 2.5 use `toInputStream(CharSequence, Charset)` instead
`static InputStream`	`toInputStream(CharSequence input, Charset encoding)` Converts the specified CharSequence to an input stream, encoded as bytes using the specified character encoding.
`static InputStream`	`toInputStream(CharSequence input, String encoding)` Converts the specified CharSequence to an input stream, encoded as bytes using the specified character encoding.
`static InputStream`	`toInputStream(String input)` 已过时。 2.5 use `toInputStream(String, Charset)` instead
`static InputStream`	`toInputStream(String input, Charset encoding)` Converts the specified string to an input stream, encoded as bytes using the specified character encoding.
`static InputStream`	`toInputStream(String input, String encoding)` Converts the specified string to an input stream, encoded as bytes using the specified character encoding.
`static String`	`toString(byte[] input)` 已过时。 2.5 Use `String.String(byte[])` instead
`static String`	`toString(byte[] input, String encoding)` Gets the contents of a `byte[]` as a String using the specified character encoding.
`static String`	`toString(InputStream input)` 已过时。 2.5 use `toString(InputStream, Charset)` instead
`static String`	`toString(InputStream input, Charset encoding)` Gets the contents of an `InputStream` as a String using the specified character encoding.
`static String`	`toString(InputStream input, String encoding)` Gets the contents of an `InputStream` as a String using the specified character encoding.
`static String`	`toString(Reader input)` Gets the contents of a `Reader` as a String.
`static String`	`toString(URI uri)` 已过时。 2.5 use `toString(URI, Charset)` instead
`static String`	`toString(URI uri, Charset encoding)` Gets the contents at the given URI.
`static String`	`toString(URI uri, String encoding)` Gets the contents at the given URI.
`static String`	`toString(URL url)` 已过时。 2.5 use `toString(URL, Charset)` instead
`static String`	`toString(URL url, Charset encoding)` Gets the contents at the given URL.
`static String`	`toString(URL url, String encoding)` Gets the contents at the given URL.
`static void`	`write(byte[] data, OutputStream output)` Writes bytes from a `byte[]` to an `OutputStream`.
`static void`	`write(byte[] data, Writer output)` 已过时。 2.5 use `write(byte[], Writer, Charset)` instead
`static void`	`write(byte[] data, Writer output, Charset encoding)` Writes bytes from a `byte[]` to chars on a `Writer` using the specified character encoding.
`static void`	`write(byte[] data, Writer output, String encoding)` Writes bytes from a `byte[]` to chars on a `Writer` using the specified character encoding.
`static void`	`write(char[] data, OutputStream output)` 已过时。 2.5 use `write(char[], OutputStream, Charset)` instead
`static void`	`write(char[] data, OutputStream output, Charset encoding)` Writes chars from a `char[]` to bytes on an `OutputStream` using the specified character encoding.
`static void`	`write(char[] data, OutputStream output, String encoding)` Writes chars from a `char[]` to bytes on an `OutputStream` using the specified character encoding.
`static void`	`write(char[] data, Writer output)` Writes chars from a `char[]` to a `Writer`
`static void`	`write(CharSequence data, OutputStream output)` 已过时。 2.5 use `write(CharSequence, OutputStream, Charset)` instead
`static void`	`write(CharSequence data, OutputStream output, Charset encoding)` Writes chars from a `CharSequence` to bytes on an `OutputStream` using the specified character encoding.
`static void`	`write(CharSequence data, OutputStream output, String encoding)` Writes chars from a `CharSequence` to bytes on an `OutputStream` using the specified character encoding.
`static void`	`write(CharSequence data, Writer output)` Writes chars from a `CharSequence` to a `Writer`.
`static void`	`write(StringBuffer data, OutputStream output)` 已过时。 replaced by write(CharSequence, OutputStream)
`static void`	`write(StringBuffer data, OutputStream output, String encoding)` 已过时。 replaced by write(CharSequence, OutputStream, String)
`static void`	`write(StringBuffer data, Writer output)` 已过时。 replaced by write(CharSequence, Writer)
`static void`	`write(String data, OutputStream output)` 已过时。 2.5 use `write(String, OutputStream, Charset)` instead
`static void`	`write(String data, OutputStream output, Charset encoding)` Writes chars from a `String` to bytes on an `OutputStream` using the specified character encoding.
`static void`	`write(String data, OutputStream output, String encoding)` Writes chars from a `String` to bytes on an `OutputStream` using the specified character encoding.
`static void`	`write(String data, Writer output)` Writes chars from a `String` to a `Writer`.
`static void`	`writeChunked(byte[] data, OutputStream output)` Writes bytes from a `byte[]` to an `OutputStream` using chunked writes.
`static void`	`writeChunked(char[] data, Writer output)` Writes chars from a `char[]` to a `Writer` using chunked writes.
`static void`	`writeLines(Collection<?> lines, String lineEnding, OutputStream output)` 已过时。 2.5 use `writeLines(Collection, String, OutputStream, Charset)` instead
`static void`	`writeLines(Collection<?> lines, String lineEnding, OutputStream output, Charset encoding)` Writes the `toString()` value of each item in a collection to an `OutputStream` line by line, using the specified character encoding and the specified line ending.
`static void`	`writeLines(Collection<?> lines, String lineEnding, OutputStream output, String encoding)` Writes the `toString()` value of each item in a collection to an `OutputStream` line by line, using the specified character encoding and the specified line ending.
`static void`	`writeLines(Collection<?> lines, String lineEnding, Writer writer)` Writes the `toString()` value of each item in a collection to a `Writer` line by line, using the specified line ending.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 字段详细资料
  - EOF
```
public static final int EOF
```
    Represents the end-of-file (or stream).
    
    从以下版本开始:
    
    2.5 (made public)
    
    另请参阅:
    
    常量字段值
  - DIR_SEPARATOR_UNIX
```
public static final char DIR_SEPARATOR_UNIX
```
    The Unix directory separator character.
    
    另请参阅:
    
    常量字段值
  - DIR_SEPARATOR_WINDOWS
```
public static final char DIR_SEPARATOR_WINDOWS
```
    The Windows directory separator character.
    
    另请参阅:
    
    常量字段值
  - DIR_SEPARATOR
```
public static final char DIR_SEPARATOR
```
    The system directory separator character.
  - LINE_SEPARATOR_UNIX
```
public static final String LINE_SEPARATOR_UNIX
```
    The Unix line separator string.
    
    另请参阅:
    
    常量字段值
  - LINE_SEPARATOR_WINDOWS
```
public static final String LINE_SEPARATOR_WINDOWS
```
    The Windows line separator string.
    
    另请参阅:
    
    常量字段值
  - LINE_SEPARATOR
```
public static final String LINE_SEPARATOR
```
    The system line separator string.
- 构造器详细资料
  - IOUtils
```
public IOUtils()
```
    Instances should NOT be constructed in standard programming.
- 方法详细资料
  - close
```
public static void close(URLConnection conn)
```
    Closes a URLConnection.
    
    参数:
    
    conn - the connection to close.
    
    从以下版本开始:
    
    2.4
  - closeQuietly
```
public static void closeQuietly(Reader input)
```
    Closes an Reader unconditionally.
    Equivalent to Reader.close(), except any exceptions will be ignored. This is typically used in finally blocks.
    Example code:
```
   char[] data = new char[1024];
   Reader in = null;
   try {
       in = new FileReader("foo.txt");
       in.read(data);
       in.close(); //close errors are handled
   } catch (Exception e) {
       // error handling
   } finally {
       IOUtils.closeQuietly(in);
   }
 
```
    参数:
    
    input - the Reader to close, may be null or already closed
  - closeQuietly
```
public static void closeQuietly(Writer output)
```
    Closes an Writer unconditionally.
    Equivalent to Writer.close(), except any exceptions will be ignored. This is typically used in finally blocks.
    Example code:
```
   Writer out = null;
   try {
       out = new StringWriter();
       out.write("Hello World");
       out.close(); //close errors are handled
   } catch (Exception e) {
       // error handling
   } finally {
       IOUtils.closeQuietly(out);
   }
 
```
    参数:
    
    output - the Writer to close, may be null or already closed
  - closeQuietly
```
public static void closeQuietly(InputStream input)
```
    Closes an InputStream unconditionally.
    Equivalent to InputStream.close(), except any exceptions will be ignored. This is typically used in finally blocks.
    Example code:
```
   byte[] data = new byte[1024];
   InputStream in = null;
   try {
       in = new FileInputStream("foo.txt");
       in.read(data);
       in.close(); //close errors are handled
   } catch (Exception e) {
       // error handling
   } finally {
       IOUtils.closeQuietly(in);
   }
 
```
    参数:
    
    input - the InputStream to close, may be null or already closed
  - closeQuietly
```
public static void closeQuietly(OutputStream output)
```
    Closes an OutputStream unconditionally.
    Equivalent to OutputStream.close(), except any exceptions will be ignored. This is typically used in finally blocks.
    Example code:
```
 byte[] data = "Hello, World".getBytes();

 OutputStream out = null;
 try {
     out = new FileOutputStream("foo.txt");
     out.write(data);
     out.close(); //close errors are handled
 } catch (IOException e) {
     // error handling
 } finally {
     IOUtils.closeQuietly(out);
 }
 
```
    参数:
    
    output - the OutputStream to close, may be null or already closed
  - closeQuietly
```
public static void closeQuietly(Closeable closeable)
```
    Closes a Closeable unconditionally.
    Equivalent to Closeable.close(), except any exceptions will be ignored. This is typically used in finally blocks.
    Example code:
```
 Closeable closeable = null;
 try {
     closeable = new FileReader("foo.txt");
     // process closeable
     closeable.close();
 } catch (Exception e) {
     // error handling
 } finally {
     IOUtils.closeQuietly(closeable);
 }
 
```
    Closing all streams:
```
 try {
     return IOUtils.copy(inputStream, outputStream);
 } finally {
     IOUtils.closeQuietly(inputStream);
     IOUtils.closeQuietly(outputStream);
 }
 
```
    参数:
    
    closeable - the objects to close, may be null or already closed
    
    从以下版本开始:
    
    2.0
  - closeQuietly
```
public static void closeQuietly(Closeable... closeables)
```
    Closes a Closeable unconditionally.
    Equivalent to Closeable.close(), except any exceptions will be ignored.
    This is typically used in finally blocks to ensure that the closeable is closed even if an Exception was thrown before the normal close statement was reached.
    It should not be used to replace the close statement(s) which should be present for the non-exceptional case.
    It is only intended to simplify tidying up where normal processing has already failed and reporting close failure as well is not necessary or useful.
    Example code:
```
 Closeable closeable = null;
 try {
     closeable = new FileReader("foo.txt");
     // processing using the closeable; may throw an Exception
     closeable.close(); // Normal close - exceptions not ignored
 } catch (Exception e) {
     // error handling
 } finally {
     IOUtils.closeQuietly(closeable); // In case normal close was skipped due to Exception
 }
 
```
    Closing all streams:
```
 try {
     return IOUtils.copy(inputStream, outputStream);
 } finally {
     IOUtils.closeQuietly(inputStream, outputStream);
 }
 
```
    参数:
    
    closeables - the objects to close, may be null or already closed
    
    从以下版本开始:
    
    2.5
    
    另请参阅:
    
    closeQuietly(Closeable)
  - closeQuietly
```
public static void closeQuietly(Socket sock)
```
    Closes a Socket unconditionally.
    Equivalent to Socket.close(), except any exceptions will be ignored. This is typically used in finally blocks.
    Example code:
```
   Socket socket = null;
   try {
       socket = new Socket("http://www.foo.com/", 80);
       // process socket
       socket.close();
   } catch (Exception e) {
       // error handling
   } finally {
       IOUtils.closeQuietly(socket);
   }
 
```
    参数:
    
    sock - the Socket to close, may be null or already closed
    
    从以下版本开始:
    
    2.0
  - closeQuietly
```
public static void closeQuietly(Selector selector)
```
    Closes a Selector unconditionally.
    Equivalent to Selector.close(), except any exceptions will be ignored. This is typically used in finally blocks.
    Example code:
```
   Selector selector = null;
   try {
       selector = Selector.open();
       // process socket

   } catch (Exception e) {
       // error handling
   } finally {
       IOUtils.closeQuietly(selector);
   }
 
```
    参数:
    
    selector - the Selector to close, may be null or already closed
    
    从以下版本开始:
    
    2.2
  - closeQuietly
```
public static void closeQuietly(ServerSocket sock)
```
    Closes a ServerSocket unconditionally.
    Equivalent to ServerSocket.close(), except any exceptions will be ignored. This is typically used in finally blocks.
    Example code:
```
   ServerSocket socket = null;
   try {
       socket = new ServerSocket();
       // process socket
       socket.close();
   } catch (Exception e) {
       // error handling
   } finally {
       IOUtils.closeQuietly(socket);
   }
 
```
    参数:
    
    sock - the ServerSocket to close, may be null or already closed
    
    从以下版本开始:
    
    2.2
  - toBufferedInputStream
```
public static InputStream toBufferedInputStream(InputStream input)
                                         throws IOException
```
    Fetches entire contents of an InputStream and represent same data as result InputStream.
    This method is useful where,
    - Source InputStream is slow.
    - It has network resources associated, so we cannot keep it open for long time.
    - It has network timeout associated.
    It can be used in favor of toByteArray(InputStream), since it avoids unnecessary allocation and copy of byte[].
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    参数:
    
    input - Stream to be fully buffered.
    
    返回:
    
    A fully buffered stream.
    
    抛出:
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.0
  - toBufferedInputStream
```
public static InputStream toBufferedInputStream(InputStream input,
                                                int size)
                                         throws IOException
```
    Fetches entire contents of an InputStream and represent same data as result InputStream.
    This method is useful where,
    - Source InputStream is slow.
    - It has network resources associated, so we cannot keep it open for long time.
    - It has network timeout associated.
    It can be used in favor of toByteArray(InputStream), since it avoids unnecessary allocation and copy of byte[].
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    参数:
    
    input - Stream to be fully buffered.
    
    size - the initial buffer size
    
    返回:
    
    A fully buffered stream.
    
    抛出:
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.5
  - toBufferedReader
```
public static BufferedReader toBufferedReader(Reader reader)
```
    Returns the given reader if it is a BufferedReader, otherwise creates a BufferedReader from the given reader.
    
    参数:
    
    reader - the reader to wrap or return (not null)
    
    返回:
    
    the given reader or a new BufferedReader for the given reader
    
    抛出:
    
    NullPointerException - if the input parameter is null
    
    从以下版本开始:
    
    2.2
    
    另请参阅:
    
    buffer(Reader)
  - toBufferedReader
```
public static BufferedReader toBufferedReader(Reader reader,
                                              int size)
```
    Returns the given reader if it is a BufferedReader, otherwise creates a BufferedReader from the given reader.
    
    参数:
    
    reader - the reader to wrap or return (not null)
    
    size - the buffer size, if a new BufferedReader is created.
    
    返回:
    
    the given reader or a new BufferedReader for the given reader
    
    抛出:
    
    NullPointerException - if the input parameter is null
    
    从以下版本开始:
    
    2.5
    
    另请参阅:
    
    buffer(Reader)
  - buffer
```
public static BufferedReader buffer(Reader reader)
```
    Returns the given reader if it is already a BufferedReader, otherwise creates a BufferedReader from the given reader.
    
    参数:
    
    reader - the reader to wrap or return (not null)
    
    返回:
    
    the given reader or a new BufferedReader for the given reader
    
    抛出:
    
    NullPointerException - if the input parameter is null
    
    从以下版本开始:
    
    2.5
  - buffer
```
public static BufferedReader buffer(Reader reader,
                                    int size)
```
    Returns the given reader if it is already a BufferedReader, otherwise creates a BufferedReader from the given reader.
    
    参数:
    
    reader - the reader to wrap or return (not null)
    
    size - the buffer size, if a new BufferedReader is created.
    
    返回:
    
    the given reader or a new BufferedReader for the given reader
    
    抛出:
    
    NullPointerException - if the input parameter is null
    
    从以下版本开始:
    
    2.5
  - buffer
```
public static BufferedWriter buffer(Writer writer)
```
    Returns the given Writer if it is already a BufferedWriter, otherwise creates a BufferedWriter from the given Writer.
    
    参数:
    
    writer - the Writer to wrap or return (not null)
    
    返回:
    
    the given Writer or a new BufferedWriter for the given Writer
    
    抛出:
    
    NullPointerException - if the input parameter is null
    
    从以下版本开始:
    
    2.5
  - buffer
```
public static BufferedWriter buffer(Writer writer,
                                    int size)
```
    Returns the given Writer if it is already a BufferedWriter, otherwise creates a BufferedWriter from the given Writer.
    
    参数:
    
    writer - the Writer to wrap or return (not null)
    
    size - the buffer size, if a new BufferedWriter is created.
    
    返回:
    
    the given Writer or a new BufferedWriter for the given Writer
    
    抛出:
    
    NullPointerException - if the input parameter is null
    
    从以下版本开始:
    
    2.5
  - buffer
```
public static BufferedOutputStream buffer(OutputStream outputStream)
```
    Returns the given OutputStream if it is already a BufferedOutputStream, otherwise creates a BufferedOutputStream from the given OutputStream.
    
    参数:
    
    outputStream - the OutputStream to wrap or return (not null)
    
    返回:
    
    the given OutputStream or a new BufferedOutputStream for the given OutputStream
    
    抛出:
    
    NullPointerException - if the input parameter is null
    
    从以下版本开始:
    
    2.5
  - buffer
```
public static BufferedOutputStream buffer(OutputStream outputStream,
                                          int size)
```
    Returns the given OutputStream if it is already a BufferedOutputStream, otherwise creates a BufferedOutputStream from the given OutputStream.
    
    参数:
    
    outputStream - the OutputStream to wrap or return (not null)
    
    size - the buffer size, if a new BufferedOutputStream is created.
    
    返回:
    
    the given OutputStream or a new BufferedOutputStream for the given OutputStream
    
    抛出:
    
    NullPointerException - if the input parameter is null
    
    从以下版本开始:
    
    2.5
  - buffer
```
public static BufferedInputStream buffer(InputStream inputStream)
```
    Returns the given InputStream if it is already a BufferedInputStream, otherwise creates a BufferedInputStream from the given InputStream.
    
    参数:
    
    inputStream - the InputStream to wrap or return (not null)
    
    返回:
    
    the given InputStream or a new BufferedInputStream for the given InputStream
    
    抛出:
    
    NullPointerException - if the input parameter is null
    
    从以下版本开始:
    
    2.5
  - buffer
```
public static BufferedInputStream buffer(InputStream inputStream,
                                         int size)
```
    Returns the given InputStream if it is already a BufferedInputStream, otherwise creates a BufferedInputStream from the given InputStream.
    
    参数:
    
    inputStream - the InputStream to wrap or return (not null)
    
    size - the buffer size, if a new BufferedInputStream is created.
    
    返回:
    
    the given InputStream or a new BufferedInputStream for the given InputStream
    
    抛出:
    
    NullPointerException - if the input parameter is null
    
    从以下版本开始:
    
    2.5
  - toByteArray
```
public static byte[] toByteArray(InputStream input)
                          throws IOException
```
    Gets the contents of an InputStream as a byte[].
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    
    参数:
    
    input - the InputStream to read from
    
    返回:
    
    the requested byte array
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs
  - toByteArray
```
public static byte[] toByteArray(InputStream input,
                                 long size)
                          throws IOException
```
    Gets contents of an InputStream as a byte[]. Use this method instead of toByteArray(InputStream) when InputStream size is known. NOTE: the method checks that the length can safely be cast to an int without truncation before using toByteArray(InputStream, int) to read into the byte array. (Arrays can have no more than Integer.MAX_VALUE entries anyway)
    
    参数:
    
    input - the InputStream to read from
    
    size - the size of InputStream
    
    返回:
    
    the requested byte array
    
    抛出:
    
    IOException - if an I/O error occurs or InputStream size differ from parameter size
    
    IllegalArgumentException - if size is less than zero or size is greater than Integer.MAX_VALUE
    
    从以下版本开始:
    
    2.1
    
    另请参阅:
    
    toByteArray(InputStream, int)
  - toByteArray
```
public static byte[] toByteArray(InputStream input,
                                 int size)
                          throws IOException
```
    Gets the contents of an InputStream as a byte[]. Use this method instead of toByteArray(InputStream) when InputStream size is known
    
    参数:
    
    input - the InputStream to read from
    
    size - the size of InputStream
    
    返回:
    
    the requested byte array
    
    抛出:
    
    IOException - if an I/O error occurs or InputStream size differ from parameter size
    
    IllegalArgumentException - if size is less than zero
    
    从以下版本开始:
    
    2.1
  - toByteArray
```
@Deprecated
public static byte[] toByteArray(Reader input)
                                       throws IOException
```
    已过时。 2.5 use toByteArray(Reader, Charset) instead
    
    Gets the contents of a Reader as a byte[] using the default character encoding of the platform.
    This method buffers the input internally, so there is no need to use a BufferedReader.
    
    参数:
    
    input - the Reader to read from
    
    返回:
    
    the requested byte array
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs
  - toByteArray
```
public static byte[] toByteArray(Reader input,
                                 Charset encoding)
                          throws IOException
```
    Gets the contents of a Reader as a byte[] using the specified character encoding.
    This method buffers the input internally, so there is no need to use a BufferedReader.
    
    参数:
    
    input - the Reader to read from
    
    encoding - the encoding to use, null means platform default
    
    返回:
    
    the requested byte array
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.3
  - toByteArray
```
public static byte[] toByteArray(Reader input,
                                 String encoding)
                          throws IOException
```
    Gets the contents of a Reader as a byte[] using the specified character encoding.
    Character encoding names can be found at IANA.
    This method buffers the input internally, so there is no need to use a BufferedReader.
    
    参数:
    
    input - the Reader to read from
    
    encoding - the encoding to use, null means platform default
    
    返回:
    
    the requested byte array
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs
    
    UnsupportedCharsetException - thrown instead of .UnsupportedEncodingException in version 2.2 if the encoding is not supported.
    
    从以下版本开始:
    
    1.1
  - toByteArray
```
@Deprecated
public static byte[] toByteArray(String input)
                                       throws IOException
```
    已过时。 2.5 Use String.getBytes() instead
    
    Gets the contents of a String as a byte[] using the default character encoding of the platform.
    This is the same as String.getBytes().
    
    参数:
    
    input - the String to convert
    
    返回:
    
    the requested byte array
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs (never occurs)
  - toByteArray
```
public static byte[] toByteArray(URI uri)
                          throws IOException
```
    Gets the contents of a URI as a byte[].
    
    参数:
    
    uri - the URI to read
    
    返回:
    
    the requested byte array
    
    抛出:
    
    NullPointerException - if the uri is null
    
    IOException - if an I/O exception occurs
    
    从以下版本开始:
    
    2.4
  - toByteArray
```
public static byte[] toByteArray(URL url)
                          throws IOException
```
    Gets the contents of a URL as a byte[].
    
    参数:
    
    url - the URL to read
    
    返回:
    
    the requested byte array
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O exception occurs
    
    从以下版本开始:
    
    2.4
  - toByteArray
```
public static byte[] toByteArray(URLConnection urlConn)
                          throws IOException
```
    Gets the contents of a URLConnection as a byte[].
    
    参数:
    
    urlConn - the URLConnection to read
    
    返回:
    
    the requested byte array
    
    抛出:
    
    NullPointerException - if the urlConn is null
    
    IOException - if an I/O exception occurs
    
    从以下版本开始:
    
    2.4
  - toCharArray
```
@Deprecated
public static char[] toCharArray(InputStream is)
                                       throws IOException
```
    已过时。 2.5 use toCharArray(InputStream, Charset) instead
    
    Gets the contents of an InputStream as a character array using the default character encoding of the platform.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    
    参数:
    
    is - the InputStream to read from
    
    返回:
    
    the requested character array
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - toCharArray
```
public static char[] toCharArray(InputStream is,
                                 Charset encoding)
                          throws IOException
```
    Gets the contents of an InputStream as a character array using the specified character encoding.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    
    参数:
    
    is - the InputStream to read from
    
    encoding - the encoding to use, null means platform default
    
    返回:
    
    the requested character array
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.3
  - toCharArray
```
public static char[] toCharArray(InputStream is,
                                 String encoding)
                          throws IOException
```
    Gets the contents of an InputStream as a character array using the specified character encoding.
    Character encoding names can be found at IANA.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    
    参数:
    
    is - the InputStream to read from
    
    encoding - the encoding to use, null means platform default
    
    返回:
    
    the requested character array
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs
    
    UnsupportedCharsetException - thrown instead of .UnsupportedEncodingException in version 2.2 if the encoding is not supported.
    
    从以下版本开始:
    
    1.1
  - toCharArray
```
public static char[] toCharArray(Reader input)
                          throws IOException
```
    Gets the contents of a Reader as a character array.
    This method buffers the input internally, so there is no need to use a BufferedReader.
    
    参数:
    
    input - the Reader to read from
    
    返回:
    
    the requested character array
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - toString
```
@Deprecated
public static String toString(InputStream input)
                                    throws IOException
```
    已过时。 2.5 use toString(InputStream, Charset) instead
    
    Gets the contents of an InputStream as a String using the default character encoding of the platform.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    
    参数:
    
    input - the InputStream to read from
    
    返回:
    
    the requested String
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs
  - toString
```
public static String toString(InputStream input,
                              Charset encoding)
                       throws IOException
```
    Gets the contents of an InputStream as a String using the specified character encoding.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    
    参数:
    
    input - the InputStream to read from
    
    encoding - the encoding to use, null means platform default
    
    返回:
    
    the requested String
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.3
  - toString
```
public static String toString(InputStream input,
                              String encoding)
                       throws IOException
```
    Gets the contents of an InputStream as a String using the specified character encoding.
    Character encoding names can be found at IANA.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    
    参数:
    
    input - the InputStream to read from
    
    encoding - the encoding to use, null means platform default
    
    返回:
    
    the requested String
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs
    
    UnsupportedCharsetException - thrown instead of .UnsupportedEncodingException in version 2.2 if the encoding is not supported.
  - toString
```
public static String toString(Reader input)
                       throws IOException
```
    Gets the contents of a Reader as a String.
    This method buffers the input internally, so there is no need to use a BufferedReader.
    
    参数:
    
    input - the Reader to read from
    
    返回:
    
    the requested String
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs
  - toString
```
@Deprecated
public static String toString(URI uri)
                                    throws IOException
```
    已过时。 2.5 use toString(URI, Charset) instead
    
    Gets the contents at the given URI.
    
    参数:
    
    uri - The URI source.
    
    返回:
    
    The contents of the URL as a String.
    
    抛出:
    
    IOException - if an I/O exception occurs.
    
    从以下版本开始:
    
    2.1
  - toString
```
public static String toString(URI uri,
                              Charset encoding)
                       throws IOException
```
    Gets the contents at the given URI.
    
    参数:
    
    uri - The URI source.
    
    encoding - The encoding name for the URL contents.
    
    返回:
    
    The contents of the URL as a String.
    
    抛出:
    
    IOException - if an I/O exception occurs.
    
    从以下版本开始:
    
    2.3.
  - toString
```
public static String toString(URI uri,
                              String encoding)
                       throws IOException
```
    Gets the contents at the given URI.
    
    参数:
    
    uri - The URI source.
    
    encoding - The encoding name for the URL contents.
    
    返回:
    
    The contents of the URL as a String.
    
    抛出:
    
    IOException - if an I/O exception occurs.
    
    UnsupportedCharsetException - thrown instead of .UnsupportedEncodingException in version 2.2 if the encoding is not supported.
    
    从以下版本开始:
    
    2.1
  - toString
```
@Deprecated
public static String toString(URL url)
                                    throws IOException
```
    已过时。 2.5 use toString(URL, Charset) instead
    
    Gets the contents at the given URL.
    
    参数:
    
    url - The URL source.
    
    返回:
    
    The contents of the URL as a String.
    
    抛出:
    
    IOException - if an I/O exception occurs.
    
    从以下版本开始:
    
    2.1
  - toString
```
public static String toString(URL url,
                              Charset encoding)
                       throws IOException
```
    Gets the contents at the given URL.
    
    参数:
    
    url - The URL source.
    
    encoding - The encoding name for the URL contents.
    
    返回:
    
    The contents of the URL as a String.
    
    抛出:
    
    IOException - if an I/O exception occurs.
    
    从以下版本开始:
    
    2.3
  - toString
```
public static String toString(URL url,
                              String encoding)
                       throws IOException
```
    Gets the contents at the given URL.
    
    参数:
    
    url - The URL source.
    
    encoding - The encoding name for the URL contents.
    
    返回:
    
    The contents of the URL as a String.
    
    抛出:
    
    IOException - if an I/O exception occurs.
    
    UnsupportedCharsetException - thrown instead of .UnsupportedEncodingException in version 2.2 if the encoding is not supported.
    
    从以下版本开始:
    
    2.1
  - toString
```
@Deprecated
public static String toString(byte[] input)
                                    throws IOException
```
    已过时。 2.5 Use String.String(byte[]) instead
    
    Gets the contents of a byte[] as a String using the default character encoding of the platform.
    
    参数:
    
    input - the byte array to read from
    
    返回:
    
    the requested String
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs (never occurs)
  - toString
```
public static String toString(byte[] input,
                              String encoding)
                       throws IOException
```
    Gets the contents of a byte[] as a String using the specified character encoding.
    Character encoding names can be found at IANA.
    
    参数:
    
    input - the byte array to read from
    
    encoding - the encoding to use, null means platform default
    
    返回:
    
    the requested String
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs (never occurs)
  - readLines
```
@Deprecated
public static List<String> readLines(InputStream input)
                                           throws IOException
```
    已过时。 2.5 use readLines(InputStream, Charset) instead
    
    Gets the contents of an InputStream as a list of Strings, one entry per line, using the default character encoding of the platform.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    
    参数:
    
    input - the InputStream to read from, not null
    
    返回:
    
    the list of Strings, never null
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - readLines
```
public static List<String> readLines(InputStream input,
                                     Charset encoding)
                              throws IOException
```
    Gets the contents of an InputStream as a list of Strings, one entry per line, using the specified character encoding.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    
    参数:
    
    input - the InputStream to read from, not null
    
    encoding - the encoding to use, null means platform default
    
    返回:
    
    the list of Strings, never null
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.3
  - readLines
```
public static List<String> readLines(InputStream input,
                                     String encoding)
                              throws IOException
```
    Gets the contents of an InputStream as a list of Strings, one entry per line, using the specified character encoding.
    Character encoding names can be found at IANA.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    
    参数:
    
    input - the InputStream to read from, not null
    
    encoding - the encoding to use, null means platform default
    
    返回:
    
    the list of Strings, never null
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs
    
    UnsupportedCharsetException - thrown instead of .UnsupportedEncodingException in version 2.2 if the encoding is not supported.
    
    从以下版本开始:
    
    1.1
  - readLines
```
public static List<String> readLines(Reader input)
                              throws IOException
```
    Gets the contents of a Reader as a list of Strings, one entry per line.
    This method buffers the input internally, so there is no need to use a BufferedReader.
    
    参数:
    
    input - the Reader to read from, not null
    
    返回:
    
    the list of Strings, never null
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - lineIterator
```
public static LineIterator lineIterator(Reader reader)
```
    Returns an Iterator for the lines in a Reader.
    LineIterator holds a reference to the open Reader specified here. When you have finished with the iterator you should close the reader to free internal resources. This can be done by closing the reader directly, or by calling LineIterator.close() or LineIterator.closeQuietly(LineIterator).
    The recommended usage pattern is:
```
 try {
   LineIterator it = IOUtils.lineIterator(reader);
   while (it.hasNext()) {
     String line = it.nextLine();
     /// do something with line
   }
 } finally {
   IOUtils.closeQuietly(reader);
 }
 
```
    参数:
    
    reader - the Reader to read from, not null
    
    返回:
    
    an Iterator of the lines in the reader, never null
    
    抛出:
    
    IllegalArgumentException - if the reader is null
    
    从以下版本开始:
    
    1.2
  - lineIterator
```
public static LineIterator lineIterator(InputStream input,
                                        Charset encoding)
                                 throws IOException
```
    Returns an Iterator for the lines in an InputStream, using the character encoding specified (or default encoding if null).
    LineIterator holds a reference to the open InputStream specified here. When you have finished with the iterator you should close the stream to free internal resources. This can be done by closing the stream directly, or by calling LineIterator.close() or LineIterator.closeQuietly(LineIterator).
    The recommended usage pattern is:
```
 try {
   LineIterator it = IOUtils.lineIterator(stream, charset);
   while (it.hasNext()) {
     String line = it.nextLine();
     /// do something with line
   }
 } finally {
   IOUtils.closeQuietly(stream);
 }
 
```
    参数:
    
    input - the InputStream to read from, not null
    
    encoding - the encoding to use, null means platform default
    
    返回:
    
    an Iterator of the lines in the reader, never null
    
    抛出:
    
    IllegalArgumentException - if the input is null
    
    IOException - if an I/O error occurs, such as if the encoding is invalid
    
    从以下版本开始:
    
    2.3
  - lineIterator
```
public static LineIterator lineIterator(InputStream input,
                                        String encoding)
                                 throws IOException
```
    Returns an Iterator for the lines in an InputStream, using the character encoding specified (or default encoding if null).
    LineIterator holds a reference to the open InputStream specified here. When you have finished with the iterator you should close the stream to free internal resources. This can be done by closing the stream directly, or by calling LineIterator.close() or LineIterator.closeQuietly(LineIterator).
    The recommended usage pattern is:
```
 try {
   LineIterator it = IOUtils.lineIterator(stream, "UTF-8");
   while (it.hasNext()) {
     String line = it.nextLine();
     /// do something with line
   }
 } finally {
   IOUtils.closeQuietly(stream);
 }
 
```
    参数:
    
    input - the InputStream to read from, not null
    
    encoding - the encoding to use, null means platform default
    
    返回:
    
    an Iterator of the lines in the reader, never null
    
    抛出:
    
    IllegalArgumentException - if the input is null
    
    IOException - if an I/O error occurs, such as if the encoding is invalid
    
    UnsupportedCharsetException - thrown instead of .UnsupportedEncodingException in version 2.2 if the encoding is not supported.
    
    从以下版本开始:
    
    1.2
  - toInputStream
```
@Deprecated
public static InputStream toInputStream(CharSequence input)
```
    已过时。 2.5 use toInputStream(CharSequence, Charset) instead
    
    Converts the specified CharSequence to an input stream, encoded as bytes using the default character encoding of the platform.
    
    参数:
    
    input - the CharSequence to convert
    
    返回:
    
    an input stream
    
    从以下版本开始:
    
    2.0
  - toInputStream
```
public static InputStream toInputStream(CharSequence input,
                                        Charset encoding)
```
    Converts the specified CharSequence to an input stream, encoded as bytes using the specified character encoding.
    
    参数:
    
    input - the CharSequence to convert
    
    encoding - the encoding to use, null means platform default
    
    返回:
    
    an input stream
    
    从以下版本开始:
    
    2.3
  - toInputStream
```
public static InputStream toInputStream(CharSequence input,
                                        String encoding)
                                 throws IOException
```
    Converts the specified CharSequence to an input stream, encoded as bytes using the specified character encoding.
    Character encoding names can be found at IANA.
    
    参数:
    
    input - the CharSequence to convert
    
    encoding - the encoding to use, null means platform default
    
    返回:
    
    an input stream
    
    抛出:
    
    IOException - if the encoding is invalid
    
    UnsupportedCharsetException - thrown instead of .UnsupportedEncodingException in version 2.2 if the encoding is not supported.
    
    从以下版本开始:
    
    2.0
  - toInputStream
```
@Deprecated
public static InputStream toInputStream(String input)
```
    已过时。 2.5 use toInputStream(String, Charset) instead
    
    Converts the specified string to an input stream, encoded as bytes using the default character encoding of the platform.
    
    参数:
    
    input - the string to convert
    
    返回:
    
    an input stream
    
    从以下版本开始:
    
    1.1
  - toInputStream
```
public static InputStream toInputStream(String input,
                                        Charset encoding)
```
    Converts the specified string to an input stream, encoded as bytes using the specified character encoding.
    
    参数:
    
    input - the string to convert
    
    encoding - the encoding to use, null means platform default
    
    返回:
    
    an input stream
    
    从以下版本开始:
    
    2.3
  - toInputStream
```
public static InputStream toInputStream(String input,
                                        String encoding)
                                 throws IOException
```
    Converts the specified string to an input stream, encoded as bytes using the specified character encoding.
    Character encoding names can be found at IANA.
    
    参数:
    
    input - the string to convert
    
    encoding - the encoding to use, null means platform default
    
    返回:
    
    an input stream
    
    抛出:
    
    IOException - if the encoding is invalid
    
    UnsupportedCharsetException - thrown instead of .UnsupportedEncodingException in version 2.2 if the encoding is not supported.
    
    从以下版本开始:
    
    1.1
  - write
```
public static void write(byte[] data,
                         OutputStream output)
                  throws IOException
```
    Writes bytes from a byte[] to an OutputStream.
    
    参数:
    
    data - the byte array to write, do not modify during output, null ignored
    
    output - the OutputStream to write to
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - writeChunked
```
public static void writeChunked(byte[] data,
                                OutputStream output)
                         throws IOException
```
    Writes bytes from a byte[] to an OutputStream using chunked writes. This is intended for writing very large byte arrays which might otherwise cause excessive memory usage if the native code has to allocate a copy.
    
    参数:
    
    data - the byte array to write, do not modify during output, null ignored
    
    output - the OutputStream to write to
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.5
  - write
```
@Deprecated
public static void write(byte[] data,
                                      Writer output)
                               throws IOException
```
    已过时。 2.5 use write(byte[], Writer, Charset) instead
    
    Writes bytes from a byte[] to chars on a Writer using the default character encoding of the platform.
    This method uses String.String(byte[]).
    
    参数:
    
    data - the byte array to write, do not modify during output, null ignored
    
    output - the Writer to write to
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - write
```
public static void write(byte[] data,
                         Writer output,
                         Charset encoding)
                  throws IOException
```
    Writes bytes from a byte[] to chars on a Writer using the specified character encoding.
    This method uses String.String(byte[], String).
    
    参数:
    
    data - the byte array to write, do not modify during output, null ignored
    
    output - the Writer to write to
    
    encoding - the encoding to use, null means platform default
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.3
  - write
```
public static void write(byte[] data,
                         Writer output,
                         String encoding)
                  throws IOException
```
    Writes bytes from a byte[] to chars on a Writer using the specified character encoding.
    Character encoding names can be found at IANA.
    This method uses String.String(byte[], String).
    
    参数:
    
    data - the byte array to write, do not modify during output, null ignored
    
    output - the Writer to write to
    
    encoding - the encoding to use, null means platform default
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    UnsupportedCharsetException - thrown instead of .UnsupportedEncodingException in version 2.2 if the encoding is not supported.
    
    从以下版本开始:
    
    1.1
  - write
```
public static void write(char[] data,
                         Writer output)
                  throws IOException
```
    Writes chars from a char[] to a Writer
    
    参数:
    
    data - the char array to write, do not modify during output, null ignored
    
    output - the Writer to write to
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - writeChunked
```
public static void writeChunked(char[] data,
                                Writer output)
                         throws IOException
```
    Writes chars from a char[] to a Writer using chunked writes. This is intended for writing very large byte arrays which might otherwise cause excessive memory usage if the native code has to allocate a copy.
    
    参数:
    
    data - the char array to write, do not modify during output, null ignored
    
    output - the Writer to write to
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.5
  - write
```
@Deprecated
public static void write(char[] data,
                                      OutputStream output)
                               throws IOException
```
    已过时。 2.5 use write(char[], OutputStream, Charset) instead
    
    Writes chars from a char[] to bytes on an OutputStream.
    This method uses String.String(char[]) and String.getBytes().
    
    参数:
    
    data - the char array to write, do not modify during output, null ignored
    
    output - the OutputStream to write to
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - write
```
public static void write(char[] data,
                         OutputStream output,
                         Charset encoding)
                  throws IOException
```
    Writes chars from a char[] to bytes on an OutputStream using the specified character encoding.
    This method uses String.String(char[]) and String.getBytes(String).
    
    参数:
    
    data - the char array to write, do not modify during output, null ignored
    
    output - the OutputStream to write to
    
    encoding - the encoding to use, null means platform default
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.3
  - write
```
public static void write(char[] data,
                         OutputStream output,
                         String encoding)
                  throws IOException
```
    Writes chars from a char[] to bytes on an OutputStream using the specified character encoding.
    Character encoding names can be found at IANA.
    This method uses String.String(char[]) and String.getBytes(String).
    
    参数:
    
    data - the char array to write, do not modify during output, null ignored
    
    output - the OutputStream to write to
    
    encoding - the encoding to use, null means platform default
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    UnsupportedCharsetException - thrown instead of .UnsupportedEncodingException in version 2.2 if the encoding is not supported.
    
    从以下版本开始:
    
    1.1
  - write
```
public static void write(CharSequence data,
                         Writer output)
                  throws IOException
```
    Writes chars from a CharSequence to a Writer.
    
    参数:
    
    data - the CharSequence to write, null ignored
    
    output - the Writer to write to
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.0
  - write
```
@Deprecated
public static void write(CharSequence data,
                                      OutputStream output)
                               throws IOException
```
    已过时。 2.5 use write(CharSequence, OutputStream, Charset) instead
    
    Writes chars from a CharSequence to bytes on an OutputStream using the default character encoding of the platform.
    This method uses String.getBytes().
    
    参数:
    
    data - the CharSequence to write, null ignored
    
    output - the OutputStream to write to
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.0
  - write
```
public static void write(CharSequence data,
                         OutputStream output,
                         Charset encoding)
                  throws IOException
```
    Writes chars from a CharSequence to bytes on an OutputStream using the specified character encoding.
    This method uses String.getBytes(String).
    
    参数:
    
    data - the CharSequence to write, null ignored
    
    output - the OutputStream to write to
    
    encoding - the encoding to use, null means platform default
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.3
  - write
```
public static void write(CharSequence data,
                         OutputStream output,
                         String encoding)
                  throws IOException
```
    Writes chars from a CharSequence to bytes on an OutputStream using the specified character encoding.
    Character encoding names can be found at IANA.
    This method uses String.getBytes(String).
    
    参数:
    
    data - the CharSequence to write, null ignored
    
    output - the OutputStream to write to
    
    encoding - the encoding to use, null means platform default
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    UnsupportedCharsetException - thrown instead of .UnsupportedEncodingException in version 2.2 if the encoding is not supported.
    
    从以下版本开始:
    
    2.0
  - write
```
public static void write(String data,
                         Writer output)
                  throws IOException
```
    Writes chars from a String to a Writer.
    
    参数:
    
    data - the String to write, null ignored
    
    output - the Writer to write to
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - write
```
@Deprecated
public static void write(String data,
                                      OutputStream output)
                               throws IOException
```
    已过时。 2.5 use write(String, OutputStream, Charset) instead
    
    Writes chars from a String to bytes on an OutputStream using the default character encoding of the platform.
    This method uses String.getBytes().
    
    参数:
    
    data - the String to write, null ignored
    
    output - the OutputStream to write to
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - write
```
public static void write(String data,
                         OutputStream output,
                         Charset encoding)
                  throws IOException
```
    Writes chars from a String to bytes on an OutputStream using the specified character encoding.
    This method uses String.getBytes(String).
    
    参数:
    
    data - the String to write, null ignored
    
    output - the OutputStream to write to
    
    encoding - the encoding to use, null means platform default
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.3
  - write
```
public static void write(String data,
                         OutputStream output,
                         String encoding)
                  throws IOException
```
    Writes chars from a String to bytes on an OutputStream using the specified character encoding.
    Character encoding names can be found at IANA.
    This method uses String.getBytes(String).
    
    参数:
    
    data - the String to write, null ignored
    
    output - the OutputStream to write to
    
    encoding - the encoding to use, null means platform default
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    UnsupportedCharsetException - thrown instead of .UnsupportedEncodingException in version 2.2 if the encoding is not supported.
    
    从以下版本开始:
    
    1.1
  - write
```
@Deprecated
public static void write(StringBuffer data,
                                      Writer output)
                               throws IOException
```
    已过时。 replaced by write(CharSequence, Writer)
    
    Writes chars from a StringBuffer to a Writer.
    
    参数:
    
    data - the StringBuffer to write, null ignored
    
    output - the Writer to write to
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - write
```
@Deprecated
public static void write(StringBuffer data,
                                      OutputStream output)
                               throws IOException
```
    已过时。 replaced by write(CharSequence, OutputStream)
    
    Writes chars from a StringBuffer to bytes on an OutputStream using the default character encoding of the platform.
    This method uses String.getBytes().
    
    参数:
    
    data - the StringBuffer to write, null ignored
    
    output - the OutputStream to write to
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - write
```
@Deprecated
public static void write(StringBuffer data,
                                      OutputStream output,
                                      String encoding)
                               throws IOException
```
    已过时。 replaced by write(CharSequence, OutputStream, String)
    
    Writes chars from a StringBuffer to bytes on an OutputStream using the specified character encoding.
    Character encoding names can be found at IANA.
    This method uses String.getBytes(String).
    
    参数:
    
    data - the StringBuffer to write, null ignored
    
    output - the OutputStream to write to
    
    encoding - the encoding to use, null means platform default
    
    抛出:
    
    NullPointerException - if output is null
    
    IOException - if an I/O error occurs
    
    UnsupportedCharsetException - thrown instead of .UnsupportedEncodingException in version 2.2 if the encoding is not supported.
    
    从以下版本开始:
    
    1.1
  - writeLines
```
@Deprecated
public static void writeLines(Collection<?> lines,
                                           String lineEnding,
                                           OutputStream output)
                                    throws IOException
```
    已过时。 2.5 use writeLines(Collection, String, OutputStream, Charset) instead
    
    Writes the toString() value of each item in a collection to an OutputStream line by line, using the default character encoding of the platform and the specified line ending.
    
    参数:
    
    lines - the lines to write, null entries produce blank lines
    
    lineEnding - the line separator to use, null is system default
    
    output - the OutputStream to write to, not null, not closed
    
    抛出:
    
    NullPointerException - if the output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - writeLines
```
public static void writeLines(Collection<?> lines,
                              String lineEnding,
                              OutputStream output,
                              Charset encoding)
                       throws IOException
```
    Writes the toString() value of each item in a collection to an OutputStream line by line, using the specified character encoding and the specified line ending.
    
    参数:
    
    lines - the lines to write, null entries produce blank lines
    
    lineEnding - the line separator to use, null is system default
    
    output - the OutputStream to write to, not null, not closed
    
    encoding - the encoding to use, null means platform default
    
    抛出:
    
    NullPointerException - if the output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.3
  - writeLines
```
public static void writeLines(Collection<?> lines,
                              String lineEnding,
                              OutputStream output,
                              String encoding)
                       throws IOException
```
    Writes the toString() value of each item in a collection to an OutputStream line by line, using the specified character encoding and the specified line ending.
    Character encoding names can be found at IANA.
    
    参数:
    
    lines - the lines to write, null entries produce blank lines
    
    lineEnding - the line separator to use, null is system default
    
    output - the OutputStream to write to, not null, not closed
    
    encoding - the encoding to use, null means platform default
    
    抛出:
    
    NullPointerException - if the output is null
    
    IOException - if an I/O error occurs
    
    UnsupportedCharsetException - thrown instead of .UnsupportedEncodingException in version 2.2 if the encoding is not supported.
    
    从以下版本开始:
    
    1.1
  - writeLines
```
public static void writeLines(Collection<?> lines,
                              String lineEnding,
                              Writer writer)
                       throws IOException
```
    Writes the toString() value of each item in a collection to a Writer line by line, using the specified line ending.
    
    参数:
    
    lines - the lines to write, null entries produce blank lines
    
    lineEnding - the line separator to use, null is system default
    
    writer - the Writer to write to, not null, not closed
    
    抛出:
    
    NullPointerException - if the input is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - copy
```
public static int copy(InputStream input,
                       OutputStream output)
                throws IOException
```
    Copies bytes from an InputStream to an OutputStream.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    Large streams (over 2GB) will return a bytes copied value of -1 after the copy has completed since the correct number of bytes cannot be returned as an int. For large streams use the copyLarge(InputStream, OutputStream) method.
    
    参数:
    
    input - the InputStream to read from
    
    output - the OutputStream to write to
    
    返回:
    
    the number of bytes copied, or -1 if > Integer.MAX_VALUE
    
    抛出:
    
    NullPointerException - if the input or output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - copy
```
public static long copy(InputStream input,
                        OutputStream output,
                        int bufferSize)
                 throws IOException
```
    Copies bytes from an InputStream to an OutputStream using an internal buffer of the given size.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    
    参数:
    
    input - the InputStream to read from
    
    output - the OutputStream to write to
    
    bufferSize - the bufferSize used to copy from the input to the output
    
    返回:
    
    the number of bytes copied
    
    抛出:
    
    NullPointerException - if the input or output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.5
  - copyLarge
```
public static long copyLarge(InputStream input,
                             OutputStream output)
                      throws IOException
```
    Copies bytes from a large (over 2GB) InputStream to an OutputStream.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    The buffer size is given by DEFAULT_BUFFER_SIZE.
    
    参数:
    
    input - the InputStream to read from
    
    output - the OutputStream to write to
    
    返回:
    
    the number of bytes copied
    
    抛出:
    
    NullPointerException - if the input or output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.3
  - copyLarge
```
public static long copyLarge(InputStream input,
                             OutputStream output,
                             byte[] buffer)
                      throws IOException
```
    Copies bytes from a large (over 2GB) InputStream to an OutputStream.
    This method uses the provided buffer, so there is no need to use a BufferedInputStream.
    
    参数:
    
    input - the InputStream to read from
    
    output - the OutputStream to write to
    
    buffer - the buffer to use for the copy
    
    返回:
    
    the number of bytes copied
    
    抛出:
    
    NullPointerException - if the input or output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.2
  - copyLarge
```
public static long copyLarge(InputStream input,
                             OutputStream output,
                             long inputOffset,
                             long length)
                      throws IOException
```
    Copies some or all bytes from a large (over 2GB) InputStream to an OutputStream, optionally skipping input bytes.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    
    Note that the implementation uses skip(InputStream, long). This means that the method may be considerably less efficient than using the actual skip implementation, this is done to guarantee that the correct number of characters are skipped.
    The buffer size is given by DEFAULT_BUFFER_SIZE.
    
    参数:
    
    input - the InputStream to read from
    
    output - the OutputStream to write to
    
    inputOffset - : number of bytes to skip from input before copying -ve values are ignored
    
    length - : number of bytes to copy. -ve means all
    
    返回:
    
    the number of bytes copied
    
    抛出:
    
    NullPointerException - if the input or output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.2
  - copyLarge
```
public static long copyLarge(InputStream input,
                             OutputStream output,
                             long inputOffset,
                             long length,
                             byte[] buffer)
                      throws IOException
```
    Copies some or all bytes from a large (over 2GB) InputStream to an OutputStream, optionally skipping input bytes.
    This method uses the provided buffer, so there is no need to use a BufferedInputStream.
    
    Note that the implementation uses skip(InputStream, long). This means that the method may be considerably less efficient than using the actual skip implementation, this is done to guarantee that the correct number of characters are skipped.
    
    参数:
    
    input - the InputStream to read from
    
    output - the OutputStream to write to
    
    inputOffset - : number of bytes to skip from input before copying -ve values are ignored
    
    length - : number of bytes to copy. -ve means all
    
    buffer - the buffer to use for the copy
    
    返回:
    
    the number of bytes copied
    
    抛出:
    
    NullPointerException - if the input or output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.2
  - copy
```
@Deprecated
public static void copy(InputStream input,
                                     Writer output)
                              throws IOException
```
    已过时。 2.5 use copy(InputStream, Writer, Charset) instead
    
    Copies bytes from an InputStream to chars on a Writer using the default character encoding of the platform.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    This method uses InputStreamReader.
    
    参数:
    
    input - the InputStream to read from
    
    output - the Writer to write to
    
    抛出:
    
    NullPointerException - if the input or output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - copy
```
public static void copy(InputStream input,
                        Writer output,
                        Charset inputEncoding)
                 throws IOException
```
    Copies bytes from an InputStream to chars on a Writer using the specified character encoding.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    This method uses InputStreamReader.
    
    参数:
    
    input - the InputStream to read from
    
    output - the Writer to write to
    
    inputEncoding - the encoding to use for the input stream, null means platform default
    
    抛出:
    
    NullPointerException - if the input or output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.3
  - copy
```
public static void copy(InputStream input,
                        Writer output,
                        String inputEncoding)
                 throws IOException
```
    Copies bytes from an InputStream to chars on a Writer using the specified character encoding.
    This method buffers the input internally, so there is no need to use a BufferedInputStream.
    Character encoding names can be found at IANA.
    This method uses InputStreamReader.
    
    参数:
    
    input - the InputStream to read from
    
    output - the Writer to write to
    
    inputEncoding - the encoding to use for the InputStream, null means platform default
    
    抛出:
    
    NullPointerException - if the input or output is null
    
    IOException - if an I/O error occurs
    
    UnsupportedCharsetException - thrown instead of .UnsupportedEncodingException in version 2.2 if the encoding is not supported.
    
    从以下版本开始:
    
    1.1
  - copy
```
public static int copy(Reader input,
                       Writer output)
                throws IOException
```
    Copies chars from a Reader to a Writer.
    This method buffers the input internally, so there is no need to use a BufferedReader.
    Large streams (over 2GB) will return a chars copied value of -1 after the copy has completed since the correct number of chars cannot be returned as an int. For large streams use the copyLarge(Reader, Writer) method.
    
    参数:
    
    input - the Reader to read from
    
    output - the Writer to write to
    
    返回:
    
    the number of characters copied, or -1 if > Integer.MAX_VALUE
    
    抛出:
    
    NullPointerException - if the input or output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - copyLarge
```
public static long copyLarge(Reader input,
                             Writer output)
                      throws IOException
```
    Copies chars from a large (over 2GB) Reader to a Writer.
    This method buffers the input internally, so there is no need to use a BufferedReader.
    The buffer size is given by DEFAULT_BUFFER_SIZE.
    
    参数:
    
    input - the Reader to read from
    
    output - the Writer to write to
    
    返回:
    
    the number of characters copied
    
    抛出:
    
    NullPointerException - if the input or output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.3
  - copyLarge
```
public static long copyLarge(Reader input,
                             Writer output,
                             char[] buffer)
                      throws IOException
```
    Copies chars from a large (over 2GB) Reader to a Writer.
    This method uses the provided buffer, so there is no need to use a BufferedReader.
    
    参数:
    
    input - the Reader to read from
    
    output - the Writer to write to
    
    buffer - the buffer to be used for the copy
    
    返回:
    
    the number of characters copied
    
    抛出:
    
    NullPointerException - if the input or output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.2
  - copyLarge
```
public static long copyLarge(Reader input,
                             Writer output,
                             long inputOffset,
                             long length)
                      throws IOException
```
    Copies some or all chars from a large (over 2GB) InputStream to an OutputStream, optionally skipping input chars.
    This method buffers the input internally, so there is no need to use a BufferedReader.
    The buffer size is given by DEFAULT_BUFFER_SIZE.
    
    参数:
    
    input - the Reader to read from
    
    output - the Writer to write to
    
    inputOffset - : number of chars to skip from input before copying -ve values are ignored
    
    length - : number of chars to copy. -ve means all
    
    返回:
    
    the number of chars copied
    
    抛出:
    
    NullPointerException - if the input or output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.2
  - copyLarge
```
public static long copyLarge(Reader input,
                             Writer output,
                             long inputOffset,
                             long length,
                             char[] buffer)
                      throws IOException
```
    Copies some or all chars from a large (over 2GB) InputStream to an OutputStream, optionally skipping input chars.
    This method uses the provided buffer, so there is no need to use a BufferedReader.
    
    参数:
    
    input - the Reader to read from
    
    output - the Writer to write to
    
    inputOffset - : number of chars to skip from input before copying -ve values are ignored
    
    length - : number of chars to copy. -ve means all
    
    buffer - the buffer to be used for the copy
    
    返回:
    
    the number of chars copied
    
    抛出:
    
    NullPointerException - if the input or output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.2
  - copy
```
@Deprecated
public static void copy(Reader input,
                                     OutputStream output)
                              throws IOException
```
    已过时。 2.5 use copy(Reader, OutputStream, Charset) instead
    
    Copies chars from a Reader to bytes on an OutputStream using the default character encoding of the platform, and calling flush.
    This method buffers the input internally, so there is no need to use a BufferedReader.
    Due to the implementation of OutputStreamWriter, this method performs a flush.
    This method uses OutputStreamWriter.
    
    参数:
    
    input - the Reader to read from
    
    output - the OutputStream to write to
    
    抛出:
    
    NullPointerException - if the input or output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - copy
```
public static void copy(Reader input,
                        OutputStream output,
                        Charset outputEncoding)
                 throws IOException
```
    Copies chars from a Reader to bytes on an OutputStream using the specified character encoding, and calling flush.
    This method buffers the input internally, so there is no need to use a BufferedReader.
    
    Due to the implementation of OutputStreamWriter, this method performs a flush.
    
    This method uses OutputStreamWriter.
    
    参数:
    
    input - the Reader to read from
    
    output - the OutputStream to write to
    
    outputEncoding - the encoding to use for the OutputStream, null means platform default
    
    抛出:
    
    NullPointerException - if the input or output is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.3
  - copy
```
public static void copy(Reader input,
                        OutputStream output,
                        String outputEncoding)
                 throws IOException
```
    Copies chars from a Reader to bytes on an OutputStream using the specified character encoding, and calling flush.
    This method buffers the input internally, so there is no need to use a BufferedReader.
    Character encoding names can be found at IANA.
    Due to the implementation of OutputStreamWriter, this method performs a flush.
    This method uses OutputStreamWriter.
    
    参数:
    
    input - the Reader to read from
    
    output - the OutputStream to write to
    
    outputEncoding - the encoding to use for the OutputStream, null means platform default
    
    抛出:
    
    NullPointerException - if the input or output is null
    
    IOException - if an I/O error occurs
    
    UnsupportedCharsetException - thrown instead of .UnsupportedEncodingException in version 2.2 if the encoding is not supported.
    
    从以下版本开始:
    
    1.1
  - contentEquals
```
public static boolean contentEquals(InputStream input1,
                                    InputStream input2)
                             throws IOException
```
    Compares the contents of two Streams to determine if they are equal or not.
    This method buffers the input internally using BufferedInputStream if they are not already buffered.
    
    参数:
    
    input1 - the first stream
    
    input2 - the second stream
    
    返回:
    
    true if the content of the streams are equal or they both don't exist, false otherwise
    
    抛出:
    
    NullPointerException - if either input is null
    
    IOException - if an I/O error occurs
  - contentEquals
```
public static boolean contentEquals(Reader input1,
                                    Reader input2)
                             throws IOException
```
    Compares the contents of two Readers to determine if they are equal or not.
    This method buffers the input internally using BufferedReader if they are not already buffered.
    
    参数:
    
    input1 - the first reader
    
    input2 - the second reader
    
    返回:
    
    true if the content of the readers are equal or they both don't exist, false otherwise
    
    抛出:
    
    NullPointerException - if either input is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    1.1
  - contentEqualsIgnoreEOL
```
public static boolean contentEqualsIgnoreEOL(Reader input1,
                                             Reader input2)
                                      throws IOException
```
    Compares the contents of two Readers to determine if they are equal or not, ignoring EOL characters.
    This method buffers the input internally using BufferedReader if they are not already buffered.
    
    参数:
    
    input1 - the first reader
    
    input2 - the second reader
    
    返回:
    
    true if the content of the readers are equal (ignoring EOL differences), false otherwise
    
    抛出:
    
    NullPointerException - if either input is null
    
    IOException - if an I/O error occurs
    
    从以下版本开始:
    
    2.2
  - skip
```
public static long skip(InputStream input,
                        long toSkip)
                 throws IOException
```
    Skips bytes from an input byte stream. This implementation guarantees that it will read as many bytes as possible before giving up; this may not always be the case for skip() implementations in subclasses of InputStream.
    Note that the implementation uses InputStream.read(byte[], int, int) rather than delegating to InputStream.skip(long). This means that the method may be considerably less efficient than using the actual skip implementation, this is done to guarantee that the correct number of bytes are skipped.
    
    参数:
    
    input - byte stream to skip
    
    toSkip - number of bytes to skip.
    
    返回:
    
    number of bytes actually skipped.
    
    抛出:
    
    IOException - if there is a problem reading the file
    
    IllegalArgumentException - if toSkip is negative
    
    从以下版本开始:
    
    2.0
    
    另请参阅:
    
    InputStream.skip(long), IO-203 - Add skipFully() method for InputStreams
  - skip
```
public static long skip(ReadableByteChannel input,
                        long toSkip)
                 throws IOException
```
    Skips bytes from a ReadableByteChannel. This implementation guarantees that it will read as many bytes as possible before giving up.
    
    参数:
    
    input - ReadableByteChannel to skip
    
    toSkip - number of bytes to skip.
    
    返回:
    
    number of bytes actually skipped.
    
    抛出:
    
    IOException - if there is a problem reading the ReadableByteChannel
    
    IllegalArgumentException - if toSkip is negative
    
    从以下版本开始:
    
    2.5
  - skip
```
public static long skip(Reader input,
                        long toSkip)
                 throws IOException
```
    Skips characters from an input character stream. This implementation guarantees that it will read as many characters as possible before giving up; this may not always be the case for skip() implementations in subclasses of Reader.
    Note that the implementation uses Reader.read(char[], int, int) rather than delegating to Reader.skip(long). This means that the method may be considerably less efficient than using the actual skip implementation, this is done to guarantee that the correct number of characters are skipped.
    
    参数:
    
    input - character stream to skip
    
    toSkip - number of characters to skip.
    
    返回:
    
    number of characters actually skipped.
    
    抛出:
    
    IOException - if there is a problem reading the file
    
    IllegalArgumentException - if toSkip is negative
    
    从以下版本开始:
    
    2.0
    
    另请参阅:
    
    Reader.skip(long), IO-203 - Add skipFully() method for InputStreams
  - skipFully
```
public static void skipFully(InputStream input,
                             long toSkip)
                      throws IOException
```
    Skips the requested number of bytes or fail if there are not enough left.
    This allows for the possibility that InputStream.skip(long) may not skip as many bytes as requested (most likely because of reaching EOF).
    Note that the implementation uses skip(InputStream, long). This means that the method may be considerably less efficient than using the actual skip implementation, this is done to guarantee that the correct number of characters are skipped.
    
    参数:
    
    input - stream to skip
    
    toSkip - the number of bytes to skip
    
    抛出:
    
    IOException - if there is a problem reading the file
    
    IllegalArgumentException - if toSkip is negative
    
    EOFException - if the number of bytes skipped was incorrect
    
    从以下版本开始:
    
    2.0
    
    另请参阅:
    
    InputStream.skip(long)
  - skipFully
```
public static void skipFully(ReadableByteChannel input,
                             long toSkip)
                      throws IOException
```
    Skips the requested number of bytes or fail if there are not enough left.
    
    参数:
    
    input - ReadableByteChannel to skip
    
    toSkip - the number of bytes to skip
    
    抛出:
    
    IOException - if there is a problem reading the ReadableByteChannel
    
    IllegalArgumentException - if toSkip is negative
    
    EOFException - if the number of bytes skipped was incorrect
    
    从以下版本开始:
    
    2.5
  - skipFully
```
public static void skipFully(Reader input,
                             long toSkip)
                      throws IOException
```
    Skips the requested number of characters or fail if there are not enough left.
    This allows for the possibility that Reader.skip(long) may not skip as many characters as requested (most likely because of reaching EOF).
    Note that the implementation uses skip(Reader, long). This means that the method may be considerably less efficient than using the actual skip implementation, this is done to guarantee that the correct number of characters are skipped.
    
    参数:
    
    input - stream to skip
    
    toSkip - the number of characters to skip
    
    抛出:
    
    IOException - if there is a problem reading the file
    
    IllegalArgumentException - if toSkip is negative
    
    EOFException - if the number of characters skipped was incorrect
    
    从以下版本开始:
    
    2.0
    
    另请参阅:
    
    Reader.skip(long)
  - read
```
public static int read(Reader input,
                       char[] buffer,
                       int offset,
                       int length)
                throws IOException
```
    Reads characters from an input character stream. This implementation guarantees that it will read as many characters as possible before giving up; this may not always be the case for subclasses of Reader.
    
    参数:
    
    input - where to read input from
    
    buffer - destination
    
    offset - initial offset into buffer
    
    length - length to read, must be >= 0
    
    返回:
    
    actual length read; may be less than requested if EOF was reached
    
    抛出:
    
    IOException - if a read error occurs
    
    从以下版本开始:
    
    2.2
  - read
```
public static int read(Reader input,
                       char[] buffer)
                throws IOException
```
    Reads characters from an input character stream. This implementation guarantees that it will read as many characters as possible before giving up; this may not always be the case for subclasses of Reader.
    
    参数:
    
    input - where to read input from
    
    buffer - destination
    
    返回:
    
    actual length read; may be less than requested if EOF was reached
    
    抛出:
    
    IOException - if a read error occurs
    
    从以下版本开始:
    
    2.2
  - read
```
public static int read(InputStream input,
                       byte[] buffer,
                       int offset,
                       int length)
                throws IOException
```
    Reads bytes from an input stream. This implementation guarantees that it will read as many bytes as possible before giving up; this may not always be the case for subclasses of InputStream.
    
    参数:
    
    input - where to read input from
    
    buffer - destination
    
    offset - initial offset into buffer
    
    length - length to read, must be >= 0
    
    返回:
    
    actual length read; may be less than requested if EOF was reached
    
    抛出:
    
    IOException - if a read error occurs
    
    从以下版本开始:
    
    2.2
  - read
```
public static int read(InputStream input,
                       byte[] buffer)
                throws IOException
```
    Reads bytes from an input stream. This implementation guarantees that it will read as many bytes as possible before giving up; this may not always be the case for subclasses of InputStream.
    
    参数:
    
    input - where to read input from
    
    buffer - destination
    
    返回:
    
    actual length read; may be less than requested if EOF was reached
    
    抛出:
    
    IOException - if a read error occurs
    
    从以下版本开始:
    
    2.2
  - read
```
public static int read(ReadableByteChannel input,
                       ByteBuffer buffer)
                throws IOException
```
    Reads bytes from a ReadableByteChannel.
    This implementation guarantees that it will read as many bytes as possible before giving up; this may not always be the case for subclasses of ReadableByteChannel.
    
    参数:
    
    input - the byte channel to read
    
    buffer - byte buffer destination
    
    返回:
    
    the actual length read; may be less than requested if EOF was reached
    
    抛出:
    
    IOException - if a read error occurs
    
    从以下版本开始:
    
    2.5
  - readFully
```
public static void readFully(Reader input,
                             char[] buffer,
                             int offset,
                             int length)
                      throws IOException
```
    Reads the requested number of characters or fail if there are not enough left.
    This allows for the possibility that Reader.read(char[], int, int) may not read as many characters as requested (most likely because of reaching EOF).
    
    参数:
    
    input - where to read input from
    
    buffer - destination
    
    offset - initial offset into buffer
    
    length - length to read, must be >= 0
    
    抛出:
    
    IOException - if there is a problem reading the file
    
    IllegalArgumentException - if length is negative
    
    EOFException - if the number of characters read was incorrect
    
    从以下版本开始:
    
    2.2
  - readFully
```
public static void readFully(Reader input,
                             char[] buffer)
                      throws IOException
```
    Reads the requested number of characters or fail if there are not enough left.
    This allows for the possibility that Reader.read(char[], int, int) may not read as many characters as requested (most likely because of reaching EOF).
    
    参数:
    
    input - where to read input from
    
    buffer - destination
    
    抛出:
    
    IOException - if there is a problem reading the file
    
    IllegalArgumentException - if length is negative
    
    EOFException - if the number of characters read was incorrect
    
    从以下版本开始:
    
    2.2
  - readFully
```
public static void readFully(InputStream input,
                             byte[] buffer,
                             int offset,
                             int length)
                      throws IOException
```
    Reads the requested number of bytes or fail if there are not enough left.
    This allows for the possibility that InputStream.read(byte[], int, int) may not read as many bytes as requested (most likely because of reaching EOF).
    
    参数:
    
    input - where to read input from
    
    buffer - destination
    
    offset - initial offset into buffer
    
    length - length to read, must be >= 0
    
    抛出:
    
    IOException - if there is a problem reading the file
    
    IllegalArgumentException - if length is negative
    
    EOFException - if the number of bytes read was incorrect
    
    从以下版本开始:
    
    2.2
  - readFully
```
public static void readFully(InputStream input,
                             byte[] buffer)
                      throws IOException
```
    Reads the requested number of bytes or fail if there are not enough left.
    This allows for the possibility that InputStream.read(byte[], int, int) may not read as many bytes as requested (most likely because of reaching EOF).
    
    参数:
    
    input - where to read input from
    
    buffer - destination
    
    抛出:
    
    IOException - if there is a problem reading the file
    
    IllegalArgumentException - if length is negative
    
    EOFException - if the number of bytes read was incorrect
    
    从以下版本开始:
    
    2.2
  - readFully
```
public static byte[] readFully(InputStream input,
                               int length)
                        throws IOException
```
    Reads the requested number of bytes or fail if there are not enough left.
    This allows for the possibility that InputStream.read(byte[], int, int) may not read as many bytes as requested (most likely because of reaching EOF).
    
    参数:
    
    input - where to read input from
    
    length - length to read, must be >= 0
    
    返回:
    
    the bytes read from input
    
    抛出:
    
    IOException - if there is a problem reading the file
    
    IllegalArgumentException - if length is negative
    
    EOFException - if the number of bytes read was incorrect
    
    从以下版本开始:
    
    2.5
  - readFully
```
public static void readFully(ReadableByteChannel input,
                             ByteBuffer buffer)
                      throws IOException
```
    Reads the requested number of bytes or fail if there are not enough left.
    This allows for the possibility that ReadableByteChannel.read(ByteBuffer) may not read as many bytes as requested (most likely because of reaching EOF).
    
    参数:
    
    input - the byte channel to read
    
    buffer - byte buffer destination
    
    抛出:
    
    IOException - if there is a problem reading the file
    
    EOFException - if the number of bytes read was incorrect
    
    从以下版本开始:
    
    2.5

类 IOUtils

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

EOF

DIR_SEPARATOR_UNIX

DIR_SEPARATOR_WINDOWS

DIR_SEPARATOR

LINE_SEPARATOR_UNIX

LINE_SEPARATOR_WINDOWS

LINE_SEPARATOR

构造器详细资料

IOUtils

方法详细资料

close

closeQuietly

closeQuietly

closeQuietly

closeQuietly

closeQuietly

closeQuietly

closeQuietly

closeQuietly

closeQuietly

toBufferedInputStream

toBufferedInputStream

toBufferedReader

toBufferedReader

buffer

buffer

buffer

buffer

buffer

buffer

buffer

buffer

toByteArray

toByteArray

toByteArray

toByteArray

toByteArray

toByteArray

toByteArray

toByteArray

toByteArray

toByteArray

toCharArray

toCharArray

toCharArray

toCharArray

toString

toString

toString

toString

toString

toString

toString

toString

toString

toString

toString

toString

readLines

readLines

readLines

readLines

lineIterator

lineIterator

lineIterator

toInputStream

toInputStream

toInputStream

toInputStream

toInputStream

toInputStream

write

writeChunked

write