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Jetty example source code file (RequestDispatcher.java)

This example Jetty source code file (RequestDispatcher.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

io, ioexception, ioexception, requestdispatcher, requestdispatcher, servletexception, servletexception, servletresponse, servletresponse

The Jetty RequestDispatcher.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.IOException;


/**
 * Defines an object that receives requests from the client
 * and sends them to any resource (such as a servlet, 
 * HTML file, or JSP file) on the server. The servlet
 * container creates the <code>RequestDispatcher object,
 * which is used as a wrapper around a server resource located
 * at a particular path or given by a particular name.
 *
 * <p>This interface is intended to wrap servlets,
 * but a servlet container can create <code>RequestDispatcher
 * objects to wrap any type of resource.
 *
 * @author 	Various
 *
 * @see 	ServletContext#getRequestDispatcher(java.lang.String)
 * @see 	ServletContext#getNamedDispatcher(java.lang.String)
 * @see 	ServletRequest#getRequestDispatcher(java.lang.String)
 *
 */
 
public interface RequestDispatcher {





/**
 * Forwards a request from
 * a servlet to another resource (servlet, JSP file, or
 * HTML file) on the server. This method allows
 * one servlet to do preliminary processing of
 * a request and another resource to generate
 * the response.
 *
 * <p>For a RequestDispatcher obtained via 
 * <code>getRequestDispatcher(), the ServletRequest 
 * object has its path elements and parameters adjusted to match
 * the path of the target resource.
 *
 * <p>forward should be called before the response has been 
 * committed to the client (before response body output has been flushed).  
 * If the response already has been committed, this method throws
 * an <code>IllegalStateException.
 * Uncommitted output in the response buffer is automatically cleared 
 * before the forward.
 *
 * <p>The request and response parameters must be either the same
 * objects as were passed to the calling servlet's service method or be
 * subclasses of the {@link ServletRequestWrapper} or {@link ServletResponseWrapper} classes
 * that wrap them.
 *
 *
 * @param request		a {@link ServletRequest} object
 *				that represents the request the client
 * 				makes of the servlet
 *
 * @param response		a {@link ServletResponse} object
 *				that represents the response the servlet
 *				returns to the client
 *
 * @exception ServletException	if the target resource throws this exception
 *
 * @exception IOException	if the target resource throws this exception
 *
 * @exception IllegalStateException	if the response was already committed
 *
 */

    public void forward(ServletRequest request, ServletResponse response)
	throws ServletException, IOException;




    /**
     *
     * Includes the content of a resource (servlet, JSP page,
     * HTML file) in the response. In essence, this method enables 
     * programmatic server-side includes.
     *
     * <p>The {@link ServletResponse} object has its path elements
     * and parameters remain unchanged from the caller's. The included
     * servlet cannot change the response status code or set headers;
     * any attempt to make a change is ignored.
     *
     * <p>The request and response parameters must be either the same
     * objects as were passed to the calling servlet's service method or be
     * subclasses of the {@link ServletRequestWrapper} or {@link ServletResponseWrapper} classes
     * that wrap them.
     * 
     *
     *
     * @param request 			a {@link ServletRequest} object 
     *					that contains the client's request
     *
     * @param response 			a {@link ServletResponse} object 
     * 					that contains the servlet's response
     *
     * @exception ServletException 	if the included resource throws this exception
     *
     * @exception IOException 		if the included resource throws this exception
     *
     *
     */
     
    public void include(ServletRequest request, ServletResponse response)
	throws ServletException, IOException;
}








Other Jetty examples (source code examples)

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