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Jetty example source code file (ServletInputStream.java)

This example Jetty source code file (ServletInputStream.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Jetty tags/keywords

inputstream, inputstream, io, ioexception, ioexception, servletinputstream, servletinputstream

The Jetty ServletInputStream.java source code



/*
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the "License").  You may not use this file except
 * in compliance with the License.
 *
 * You can obtain a copy of the license at
 * glassfish/bootstrap/legal/CDDLv1.0.txt or
 * https://glassfish.dev.java.net/public/CDDLv1.0.html.
 * See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL
 * HEADER in each file and include the License file at
 * glassfish/bootstrap/legal/CDDLv1.0.txt.  If applicable,
 * add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your
 * own identifying information: Portions Copyright [yyyy]
 * [name of copyright owner]
 *
 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
 *
 * Portions Copyright Apache Software Foundation.
 */ 

package javax.servlet;

import java.io.InputStream;
import java.io.IOException;

/**
 * 
 * Provides an input stream for reading binary data from a client
 * request, including an efficient <code>readLine method
 * for reading data one line at a time. With some protocols, such
 * as HTTP POST and PUT, a <code>ServletInputStream
 * object can be used to read data sent from the client.
 *
 * <p>A ServletInputStream object is normally retrieved via
 * the {@link ServletRequest#getInputStream} method.
 *
 *
 * <p>This is an abstract class that a servlet container implements.
 * Subclasses of this class
 * must implement the <code>java.io.InputStream.read() method.
 *
 *
 * @author 	Various
 *
 * @see		ServletRequest 
 *
 */

public abstract class ServletInputStream extends InputStream {



    /**
     * Does nothing, because this is an abstract class.
     *
     */

    protected ServletInputStream() { }

  
  
    
    /**
     *
     * 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.
     *
     * <p>This method returns -1 if it reaches the end of the input
     * stream before reading the maximum number of bytes.
     *
     *
     *
     * @param b 		an array of bytes into which data is read
     *
     * @param off 		an integer specifying the character at which
     *				this method begins reading
     *
     * @param len		an integer specifying the maximum number of 
     *				bytes to read
     *
     * @return			an integer specifying the actual number of bytes 
     *				read, or -1 if the end of the stream is reached
     *
     * @exception IOException	if an input or output exception has occurred
     *
     */
     
    public int readLine(byte[] b, int off, int len) throws IOException {

	if (len <= 0) {
	    return 0;
	}
	int count = 0, c;

	while ((c = read()) != -1) {
	    b[off++] = (byte)c;
	    count++;
	    if (c == '\n' || count == len) {
		break;
	    }
	}
	return count > 0 ? count : -1;
    }
}



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