com.oreilly.servlet.multipart
类 PartInputStream

java.lang.Object
  java.io.InputStream
      java.io.FilterInputStream
          com.oreilly.servlet.multipart.PartInputStream

所有已实现的接口：

Closeable

public class PartInputStream
extends FilterInputStream

A PartInputStream filters a ServletInputStream, providing access to a single MIME part contained with in which ends with the boundary specified. It uses buffering to provide maximum performance.

Note the readLine method of ServletInputStream has the annoying habit of adding a \r\n to the end of the last line. Since we want a byte-for-byte transfer, we have to cut those chars. This means that we must always maintain at least 2 characters in our buffer to allow us to trim when necessary.

版本：

1.4, 2002/11/01, fix for "unexpected end of part" caused by boundary newlines split across buffers, 1.3, 2001/05/21, fix to handle boundaries crossing 64K mark, 1.2, 2001/02/07, added read(byte[]) implementation for safety, 1.1, 2000/11/26, fixed available() to never return negative, 1.0, 2000/10/27, initial revision

作者：

Geoff Soutter, Jason Hunter

字段摘要

从类 java.io.FilterInputStream 继承的字段

in

方法摘要

int	available() Returns the number of bytes that can be read from this input stream without blocking.
void	close() Closes this input stream and releases any system resources associated with the stream.
int	read() See the general contract of the read method of InputStream.
int	read(byte[] b) See the general contract of the read method of InputStream.
int	read(byte[] b, int off, int len) See the general contract of the read method of InputStream.

从类 java.io.FilterInputStream 继承的方法

mark, markSupported, reset, skip

从类 java.lang.Object 继承的方法

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

方法详细信息

read

public int read()
         throws IOException

See the general contract of the read method of InputStream.

Returns -1 (end of file) when the MIME boundary of this part is encountered.

覆盖：

类 FilterInputStream 中的 read

返回：

the next byte of data, or -1 if the end of the stream is reached.

抛出：

IOException - if an I/O error occurs.

read

public int read(byte[] b)
         throws IOException

See the general contract of the read method of InputStream.

Returns -1 (end of file) when the MIME boundary of this part is encountered.

覆盖：

类 FilterInputStream 中的 read

参数：

b - the buffer into which the data is read.

返回：

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

抛出：

IOException - if an I/O error occurs.

read

public int read(byte[] b,
                int off,
                int len)
         throws IOException

See the general contract of the read method of InputStream.

Returns -1 (end of file) when the MIME boundary of this part is encountered.

覆盖：

类 FilterInputStream 中的 read

参数：

b - the buffer into which the data is read.

off - the start offset of the data.

len - the maximum number of bytes read.

返回：

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

抛出：

IOException - if an I/O error occurs.

available

public int available()
              throws IOException

Returns the number of bytes that can be read from this input stream without blocking. This is a standard InputStream idiom to deal with buffering gracefully, and is not same as the length of the part arriving in this stream.

覆盖：

类 FilterInputStream 中的 available

返回：

the number of bytes that can be read from the input stream without blocking.

抛出：

IOException - if an I/O error occurs.

close

public void close()
           throws IOException

Closes this input stream and releases any system resources associated with the stream.

This method will read any unread data in the MIME part so that the next part starts an an expected place in the parent InputStream. Note that if the client code forgets to call this method on error, MultipartParser will call it automatically if you call readNextPart().

指定者：

接口 Closeable 中的 close

覆盖：

类 FilterInputStream 中的 close

抛出：

IOException - if an I/O error occurs.