Source Code Cross Referenced for IncludeAction.java in  » Web-Framework » struts-1.3.8 » org » apache » struts » actions » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » struts 1.3.8 » org.apache.struts.actions 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * $Id: IncludeAction.java 471754 2006-11-06 14:55:09Z husted $
03:         *
04:         * Licensed to the Apache Software Foundation (ASF) under one
05:         * or more contributor license agreements.  See the NOTICE file
06:         * distributed with this work for additional information
07:         * regarding copyright ownership.  The ASF licenses this file
08:         * to you under the Apache License, Version 2.0 (the
09:         * "License"); you may not use this file except in compliance
10:         * with the License.  You may obtain a copy of the License at
11:         *
12:         *  http://www.apache.org/licenses/LICENSE-2.0
13:         *
14:         * Unless required by applicable law or agreed to in writing,
15:         * software distributed under the License is distributed on an
16:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17:         * KIND, either express or implied.  See the License for the
18:         * specific language governing permissions and limitations
19:         * under the License.
20:         */
21:        package org.apache.struts.actions;
22:
23:        import org.apache.struts.action.ActionForm;
24:        import org.apache.struts.action.ActionForward;
25:        import org.apache.struts.action.ActionMapping;
26:
27:        import javax.servlet.RequestDispatcher;
28:        import javax.servlet.ServletException;
29:        import javax.servlet.http.HttpServletRequest;
30:        import javax.servlet.http.HttpServletResponse;
31:
32:        /**
33:         * <p>An <strong>Action</strong> that includes the context-relative URI
34:         * specified by the <code>parameter</code> property of our associated
35:         * <code>ActionMapping</code>.  This can be used to integrate Struts with
36:         * other business logic components that are implemented as servlets (or JSP
37:         * pages), but still take advantage of the Struts controller servlet's
38:         * functionality (such as processing of form beans).</p>
39:         *
40:         * <p>To configure the use of this Action in your <code>struts-config.xml</code>
41:         * file, create an entry like this:</p>
42:         *
43:         * <code> &lt;action path="/saveSubscription"
44:         * type="org.apache.struts.actions.IncludeAction"
45:         * name="subscriptionForm" scope="request" input="/subscription.jsp"
46:         * parameter="/path/to/processing/servlet"&gt; </code>
47:         *
48:         * <p>which will include the context-relative URI specified by the
49:         * <code>parameter</code> attribute.</p>
50:         *
51:         * @version $Rev: 471754 $ $Date: 2005-11-09 00:11:45 -0500 (Wed, 09 Nov 2005)
52:         *          $
53:         */
54:        public class IncludeAction extends BaseAction {
55:            // ----------------------------------------------------- Instance Variables
56:
57:            /**
58:             * Process the specified HTTP request, and create the corresponding HTTP
59:             * response (or forward to another web component that will create it).
60:             * Return an <code>ActionForward</code> instance describing where and how
61:             * control should be forwarded, or <code>null</code> if the response has
62:             * already been completed.
63:             *
64:             * @param mapping  The ActionMapping used to select this instance
65:             * @param form     The optional ActionForm bean for this request (if any)
66:             * @param request  The HTTP request we are processing
67:             * @param response The HTTP response we are creating
68:             * @return The forward to which control should be transferred, or
69:             *         <code>null</code> if the response has been completed.
70:             * @throws Exception if an error occurs
71:             */
72:            public ActionForward execute(ActionMapping mapping,
73:                    ActionForm form, HttpServletRequest request,
74:                    HttpServletResponse response) throws Exception {
75:                // Create a RequestDispatcher the corresponding resource
76:                String path = mapping.getParameter();
77:
78:                if (path == null) {
79:                    throw new ServletException(messages
80:                            .getMessage("include.path"));
81:                }
82:
83:                RequestDispatcher rd = servlet.getServletContext()
84:                        .getRequestDispatcher(path);
85:
86:                if (rd == null) {
87:                    throw new ServletException(messages.getMessage(
88:                            "include.rd", path));
89:                }
90:
91:                // Forward control to the specified resource
92:                rd.include(request, response);
93:
94:                // Tell the controller servlet that the response has been created
95:                return (null);
96:            }
97:        }
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