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  /*
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
   *
   * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
   *
   * The contents of this file are subject to the terms of either the GNU
   * General Public License Version 2 only ("GPL") or the Common Development
   * and Distribution License("CDDL") (collectively, the "License").  You
   * may not use this file except in compliance with the License.  You can
  * obtain a copy of the License at
  * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
  * or packager/legal/LICENSE.txt.  See the License for the specific
  * language governing permissions and limitations under the License.
  *
  * When distributing the software, include this License Header Notice in each
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  *
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  * exception as provided by Oracle in the GPL Version 2 section of the License
  * file that accompanied this code.
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  *
  * Contributor(s):
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  * its licensees as provided above.  However, if you add GPL Version 2 code
  * and therefore, elected the GPL Version 2 license, then the option applies
  * only if the new code is made subject to such option by the copyright
  * holder.
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  *
  * This file incorporates work covered by the following copyright and
  * permission notice:
  *
  * Copyright 2004 The Apache Software Foundation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
 package javax.servlet;
 
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 RequestDispatcher object, which is used as a wrapper around a server resource located at a particular path or given by a particular name.

This interface is intended to wrap servlets, but a servlet container can create RequestDispatcher objects to wrap any type of resource.

 
  
 public interface RequestDispatcher {

    
The name of the request attribute under which the original request URI is made available to the target of a forward
 
     static final String FORWARD_REQUEST_URI = "javax.servlet.forward.request_uri";

    
The name of the request attribute under which the original context path is made available to the target of a forward
 
     static final String FORWARD_CONTEXT_PATH = "javax.servlet.forward.context_path";

    
The name of the request attribute under which the original path info is made available to the target of a forward
    static final String FORWARD_PATH_INFO = "javax.servlet.forward.path_info";

    
The name of the request attribute under which the original servlet path is made available to the target of a forward
    static final String FORWARD_SERVLET_PATH = "javax.servlet.forward.servlet_path";

    
The name of the request attribute under which the original query string is made available to the target of a forward
    static final String FORWARD_QUERY_STRING = "javax.servlet.forward.query_string";

    
The name of the request attribute under which the request URI of the target of an include is stored
    static final String INCLUDE_REQUEST_URI = "javax.servlet.include.request_uri";

    
The name of the request attribute under which the context path of the target of an include is stored
    static final String INCLUDE_CONTEXT_PATH = "javax.servlet.include.context_path";

    
The name of the request attribute under which the path info of the target of an include is stored
    static final String INCLUDE_PATH_INFO = "javax.servlet.include.path_info";

    
The name of the request attribute under which the servlet path of the target of an include is stored
    static final String INCLUDE_SERVLET_PATH = "javax.servlet.include.servlet_path";

    
The name of the request attribute under which the query string of the target of an include is stored
    static final String INCLUDE_QUERY_STRING = "javax.servlet.include.query_string";

    
The name of the request attribute under which the exception object is propagated during an error dispatch
    public static final String ERROR_EXCEPTION = "javax.servlet.error.exception";

    
The name of the request attribute under which the type of the exception object is propagated during an error dispatch
    public static final String ERROR_EXCEPTION_TYPE = "javax.servlet.error.exception_type";

    
The name of the request attribute under which the exception message is propagated during an error dispatch
    public static final String ERROR_MESSAGE = "javax.servlet.error.message";

    
The name of the request attribute under which the request URI whose processing caused the error is propagated during an error dispatch
    public static final String ERROR_REQUEST_URI = "javax.servlet.error.request_uri";

    
The name of the request attribute under which the name of the servlet in which the error occurred is propagated during an error dispatch
    public static final String ERROR_SERVLET_NAME = "javax.servlet.error.servlet_name";

    
The name of the request attribute under which the response status is propagated during an error dispatch
    public static final String ERROR_STATUS_CODE = "javax.servlet.error.status_code";


    
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.

For a RequestDispatcher obtained via getRequestDispatcher(), the ServletRequest object has its path elements and parameters adjusted to match the path of the target resource.

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 IllegalStateException. Uncommitted output in the response buffer is automatically cleared before the forward.

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 ServletRequestWrapper or ServletResponseWrapper classes that wrap them.

This method sets the dispatcher type of the given request to DispatcherType.FORWARD.

Parameters:
request a ServletRequest object that represents the request the client makes of the servlet
response a ServletResponse object that represents the response the servlet returns to the client
Throws:
ServletException if the target resource throws this exception
java.io.IOException if the target resource throws this exception
java.lang.IllegalStateException if the response was already committed
See also:
ServletRequest.getDispatcherType()
    public void forward(ServletRequest requestServletResponse response)
        throws ServletExceptionIOException;

    
Includes the content of a resource (servlet, JSP page, HTML file) in the response. In essence, this method enables programmatic server-side includes.

The 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.

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 ServletRequestWrapper or ServletResponseWrapper classes that wrap them.

This method sets the dispatcher type of the given request to DispatcherType.INCLUDE.

Parameters:
request a ServletRequest object that contains the client's request
response a ServletResponse object that contains the servlet's response
Throws:
ServletException if the included resource throws this exception
java.io.IOException if the included resource throws this exception
See also:
ServletRequest.getDispatcherType()
    public void include(ServletRequest requestServletResponse response)
        throws ServletExceptionIOException;
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