javax.servlet Class ServletInputStream


public abstract class ServletInputStream

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 method.

See Also:

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
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


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


public int readLine(byte[] b,
                    int off,
                    int len)
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.

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
an integer specifying the actual number of bytes read, or -1 if the end of the stream is reached
Throws: - if an input or output exception has occurred