com.oreilly.servlet.multipart
Class LimitedServletInputStream

java.lang.Object
  java.io.InputStream
      javax.servlet.ServletInputStream
          com.oreilly.servlet.multipart.LimitedServletInputStream

All Implemented Interfaces:

java.io.Closeable

public class LimitedServletInputStream
extends javax.servlet.ServletInputStream

A LimitedServletInputStream wraps another ServletInputStream in order to keep track of how many bytes have been read and detect when the Content-Length limit has been reached. This is necessary since some servlet containers are slow to notice the end of stream and cause the client code to hang if it tries to read past it.

Version:

1.0, 2000/10/27, initial revision

Author:

Jason Hunter, Geoff Soutter

Constructor Summary

LimitedServletInputStream(javax.servlet.ServletInputStream in, int totalExpected)
Creates a LimitedServletInputStream with the specified length limit that wraps the provided ServletInputStream.

Method Summary

int	read() Implement length limitation on top of the read method of the wrapped ServletInputStream.
int	read(byte[] b, int off, int len) Implement length limitation on top of the read method of the wrapped ServletInputStream.
int	readLine(byte[] b, int off, int len) Implement length limitation on top of the readLine method of the wrapped ServletInputStream.

Methods inherited from class java.io.InputStream

available, close, mark, markSupported, read, reset, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

LimitedServletInputStream

public LimitedServletInputStream(javax.servlet.ServletInputStream in,
                                 int totalExpected)

Creates a LimitedServletInputStream with the specified length limit that wraps the provided ServletInputStream.

Method Detail

readLine

public int readLine(byte[] b,
                    int off,
                    int len)
             throws java.io.IOException

Implement length limitation on top of the readLine method of the wrapped ServletInputStream.

Overrides:

readLine in class javax.servlet.ServletInputStream

Parameters:

b - an array of bytes into which data is read.

off - an integer specifying the character at which this method begins reading.

len - an integer specifying the maximum number of bytes to read.

Returns:

an integer specifying the actual number of bytes read, or -1 if the end of the stream is reached.

Throws:

java.io.IOException - if an I/O error occurs.

read

public int read()
         throws java.io.IOException

Implement length limitation on top of the read method of the wrapped ServletInputStream.

Specified by:

read in class java.io.InputStream

Returns:

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

Throws:

java.io.IOException - if an I/O error occurs.

read

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

Implement length limitation on top of the read method of the wrapped ServletInputStream.

Overrides:

read in class java.io.InputStream

Parameters:

b - destination buffer.

off - offset at which to start storing bytes.

len - maximum number of bytes to read.

Returns:

the number of bytes read, or -1 if the end of the stream has been reached.

Throws:

java.io.IOException - if an I/O error occurs.