com.alibaba.cloud.commons.io

Class FileUtils

java.lang.Object

com.alibaba.cloud.commons.io.FileUtils

public final class FileUtils
extends Object

FileUtils. copy from apache commons-io.

Author:

theonefx

Method Summary

Modifier and Type	Method and Description
static FileInputStream	openInputStream(File file) Opens a FileInputStream for the specified file, providing better error messages than simply calling new FileInputStream(file).
static String	readFileToString(File file) Deprecated. 2.5 use readFileToString(File, String) instead (and specify the appropriate encoding)
static String	readFileToString(File file, Charset encoding) Reads the contents of a file into a String.
static String	readFileToString(File file, String encoding) Reads the contents of a file into a String.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

openInputStream

public static FileInputStream openInputStream(File file)
                                       throws IOException

Opens a FileInputStream for the specified file, providing better error messages than simply calling new FileInputStream(file).

At the end of the method either the stream will be successfully opened, or an exception will have been thrown.

An exception is thrown if the file does not exist. An exception is thrown if the file object exists but is a directory. An exception is thrown if the file exists but cannot be read.

Parameters:

file - the file to open for input, must not be null

Returns:

a new FileInputStream for the specified file

Throws:

FileNotFoundException - if the file does not exist

IOException - if the file object is a directory

IOException - if the file cannot be read

Since:

1.3

readFileToString

public static String readFileToString(File file,
                                      Charset encoding)
                               throws IOException

Reads the contents of a file into a String. The file is always closed.

Parameters:

file - the file to read, must not be null

encoding - the encoding to use, null means platform default

Returns:

the file contents, never null

Throws:

IOException - in case of an I/O error

readFileToString

public static String readFileToString(File file,
                                      String encoding)
                               throws IOException

Reads the contents of a file into a String. The file is always closed.

Parameters:

file - the file to read, must not be null

encoding - the encoding to use, null means platform default

Returns:

the file contents, never null

Throws:

IOException - in case of an I/O error

UnsupportedCharsetException - thrown instead of .UnsupportedEncodingException in version 2.2 if the encoding is not supported.

readFileToString

@Deprecated
public static String readFileToString(File file)
                                           throws IOException

Deprecated. 2.5 use readFileToString(File, String) instead (and specify the appropriate encoding)

Reads the contents of a file into a String using the default encoding for the VM. The file is always closed.

Parameters:

file - the file to read, must not be null

Returns:

the file contents, never null

Throws:

IOException - in case of an I/O error