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Class ServletInputStream

java.lang.Object  |  +--java.io.InputStream        |        +--javax.servlet.ServletInputStream

public abstract classServletInputStream

extends java.io.InputStream

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

AServletInputStream object is normally retrieved via theServletRequest.getInputStream() method.

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

See Also:

ServletRequest

ServletInputStream

protectedServletInputStream()

Does nothing, because this is an abstract class.

readLine

public intreadLine(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 whichthis 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