javax.servlet
Class ServletInputStream

java.lang.Object
  java.io.InputStream
      javax.servlet.ServletInputStream

public abstract class ServletInputStream

extends java.io.InputStream

Provides an input stream for reading binary data from a client request, including an efficient readLine method for reading data one line at a time. With some protocols, such as HTTP POST and PUT, a ServletInputStream object can be used to read data sent from the client.

A ServletInputStream object is normally retrieved via the ServletRequest.getInputStream() method.

This is an abstract class that a servlet container implements. Subclasses of this class must implement the java.io.InputStream.read() method.

Version:

$Version$

Author:

Various

See Also:

ServletRequest

Constructor Summary

protected

ServletInputStream() Does nothing, because this is an abstract class.

Method Summary

int	readLine(byte[] b, int off, int len) Reads the input stream, one line at a time.

Methods inherited from class java.io.InputStream

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

Methods inherited from class java.lang.Object

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

Constructor Detail

ServletInputStream

protected ServletInputStream()

Does nothing, because this is an abstract class.

Method Detail

readLine

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

Reads the input stream, one line at a time. Starting at an offset, reads bytes into an array, until it reads a certain number of bytes or reaches a newline character, which it reads into the array as well.

This method returns -1 if it reaches the end of the input stream before reading the maximum number of bytes.

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 input or output exception has occurred