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.
public int readLine(byte b,
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
java.io.IOException - if an input or output exception has occurred