Quelle RequestDispatcher.java Sprache: JAVA

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 jakarta.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</code> 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 <code>RequestDispatcher</code>
* objects to wrap any type of resource.
*
* @see ServletContext#getRequestDispatcher(String)
* @see ServletContext#getNamedDispatcher(String)
* @see ServletRequest#getRequestDispatcher(String)
*/
public interface RequestDispatcher {

 /**
 * The name of the request attribute that should be set by the container when the
 * {@link #forward(ServletRequest, ServletResponse)} method is called. It provides the original value of a
 * path-related property of the request. See the chapter "Forwarded Request Parameters" in the Servlet Specification
 * for details.
 *
 * @since Servlet 3.0
 */
 String FORWARD_REQUEST_URI = "jakarta.servlet.forward.request_uri";

 /**
 * The name of the request attribute that should be set by the container when the
 * {@link #forward(ServletRequest, ServletResponse)} method is called. It provides the original value of a
 * path-related property of the request. See the chapter "Forwarded Request Parameters" in the Servlet Specification
 * for details.
 *
 * @since Servlet 3.0
 */
 String FORWARD_CONTEXT_PATH = "jakarta.servlet.forward.context_path";

 /**
 * The name of the request attribute that should be set by the container when the
 * {@link #forward(ServletRequest, ServletResponse)} method is called. It provides the original value of a
 * path-related property of the request. See the chapter "Forwarded Request Parameters" in the Servlet Specification
 * for details.
 *
 * @since Servlet 4.0
 */
 String FORWARD_MAPPING = "jakarta.servlet.forward.mapping";

 /**
 * The name of the request attribute that should be set by the container when the
 * {@link #forward(ServletRequest, ServletResponse)} method is called. It provides the original value of a
 * path-related property of the request. See the chapter "Forwarded Request Parameters" in the Servlet Specification
 * for details.
 *
 * @since Servlet 3.0
 */
 String FORWARD_PATH_INFO = "jakarta.servlet.forward.path_info";

 /**
 * The name of the request attribute that should be set by the container when the
 * {@link #forward(ServletRequest, ServletResponse)} method is called. It provides the original value of a
 * path-related property of the request. See the chapter "Forwarded Request Parameters" in the Servlet Specification
 * for details.
 *
 * @since Servlet 3.0
 */
 String FORWARD_SERVLET_PATH = "jakarta.servlet.forward.servlet_path";

 /**
 * The name of the request attribute that should be set by the container when the
 * {@link #forward(ServletRequest, ServletResponse)} method is called. It provides the original value of a
 * path-related property of the request. See the chapter "Forwarded Request Parameters" in the Servlet Specification
 * for details.
 *
 * @since Servlet 3.0
 */
 String FORWARD_QUERY_STRING = "jakarta.servlet.forward.query_string";

 /**
 * The name of the request attribute that should be set by the container when the
 * {@link #include(ServletRequest, ServletResponse)} method is called on the {@code RequestDispatcher} obtained by a
 * path and not by a name. It provides information on the path that was used to obtain the {@code RequestDispatcher}
 * instance for this include call. See the chapter "Included Request Parameters" in the Servlet Specification for
 * details.
 *
 * @since Servlet 3.0
 */
 String INCLUDE_REQUEST_URI = "jakarta.servlet.include.request_uri";

 /**
 * The name of the request attribute that should be set by the container when the
 * {@link #include(ServletRequest, ServletResponse)} method is called on the {@code RequestDispatcher} obtained by a
 * path and not by a name. It provides information on the path that was used to obtain the {@code RequestDispatcher}
 * instance for this include call. See the chapter "Included Request Parameters" in the Servlet Specification for
 * details.
 *
 * @since Servlet 3.0
 */
 String INCLUDE_CONTEXT_PATH = "jakarta.servlet.include.context_path";

 /**
 * The name of the request attribute that should be set by the container when the
 * {@link #include(ServletRequest, ServletResponse)} method is called on the {@code RequestDispatcher} obtained by a
 * path and not by a name. It provides information on the path that was used to obtain the {@code RequestDispatcher}
 * instance for this include call. See the chapter "Included Request Parameters" in the Servlet Specification for
 * details.
 *
 * @since Servlet 3.0
 */
 String INCLUDE_PATH_INFO = "jakarta.servlet.include.path_info";

 /**
 * The name of the request attribute that should be set by the container when the
 * {@link #include(ServletRequest, ServletResponse)} method is called on the {@code RequestDispatcher} obtained by a
 * path and not by a name. It provides information on the path that was used to obtain the {@code RequestDispatcher}
 * instance for this include call. See the chapter "Included Request Parameters" in the Servlet Specification for
 * details.
 *
 * @since Servlet 4.0
 */
 String INCLUDE_MAPPING = "jakarta.servlet.include.mapping";

 /**
 * The name of the request attribute that should be set by the container when the
 * {@link #include(ServletRequest, ServletResponse)} method is called on the {@code RequestDispatcher} obtained by a
 * path and not by a name. It provides information on the path that was used to obtain the {@code RequestDispatcher}
 * instance for this include call. See the chapter "Included Request Parameters" in the Servlet Specification for
 * details.
 *
 * @since Servlet 3.0
 */
 String INCLUDE_SERVLET_PATH = "jakarta.servlet.include.servlet_path";

 /**
 * The name of the request attribute that should be set by the container when the
 * {@link #include(ServletRequest, ServletResponse)} method is called on the {@code RequestDispatcher} obtained by a
 * path and not by a name. It provides information on the path that was used to obtain the {@code RequestDispatcher}
 * instance for this include call. See the chapter "Included Request Parameters" in the Servlet Specification for
 * details.
 *
 * @since Servlet 3.0
 */
 String INCLUDE_QUERY_STRING = "jakarta.servlet.include.query_string";

 /**
 * The name of the request attribute that should be set by the container when custom error-handling servlet or JSP
 * page is invoked. The value of the attribute is of type {@code java.lang.Throwable}. See the chapter "Error
 * Handling" in the Servlet Specification for details.
 *
 * @since Servlet 3.0
 */
 String ERROR_EXCEPTION = "jakarta.servlet.error.exception";

 /**
 * The name of the request attribute that should be set by the container when custom error-handling servlet or JSP
 * page is invoked. The value of the attribute is of type {@code java.lang.Class}. See the chapter "Error Handling"
 * in the Servlet Specification for details.
 *
 * @since Servlet 3.0
 */
 String ERROR_EXCEPTION_TYPE = "jakarta.servlet.error.exception_type";

 /**
 * The name of the request attribute that should be set by the container when custom error-handling servlet or JSP
 * page is invoked. The value of the attribute is of type {@code String}. See the chapter "Error Handling" in the
 * Servlet Specification for details.
 *
 * @since Servlet 3.0
 */
 String ERROR_MESSAGE = "jakarta.servlet.error.message";

 /**
 * The name of the request attribute that should be set by the container when custom error-handling servlet or JSP
 * page is invoked. The value of the attribute is of type {@code String}. See the chapter "Error Handling" in the
 * Servlet Specification for details.
 *
 * @since Servlet 3.0
 */
 String ERROR_REQUEST_URI = "jakarta.servlet.error.request_uri";

 /**
 * The name of the request attribute that should be set by the container when custom error-handling servlet or JSP
 * page is invoked. The value of the attribute is of type {@code String}. See the chapter "Error Handling" in the
 * Servlet Specification for details.
 *
 * @since Servlet 3.0
 */
 String ERROR_SERVLET_NAME = "jakarta.servlet.error.servlet_name";

 /**
 * The name of the request attribute that should be set by the container when custom error-handling servlet or JSP
 * page is invoked. The value of the attribute is of type {@code java.lang.Integer}. See the chapter "Error
 * Handling" in the Servlet Specification for details.
 *
 * @since Servlet 3.0
 */
 String ERROR_STATUS_CODE = "jakarta.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 <code>RequestDispatcher</code> obtained via <code>getRequestDispatcher()</code>, the
 * <code>ServletRequest</code> object has its path elements and parameters adjusted to match the path of the target
 * resource.
 * 
 * <code>forward</code> 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</code>. 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 {@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
 */
 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.
 * 
 * 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.
 * 
 * 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
 */
 void include(ServletRequest request, ServletResponse response) throws ServletException, IOException;
}

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