AjaxActionHelper


1   /**
2    * Copyright (C) 2007 Jens Kapitza
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    * http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.ajaxtags.servlets;
17  
18  import javax.servlet.http.HttpServletRequest  ;
19  import javax.servlet.http.HttpServletResponse  ;
20  
21  
22  /**
23   * 
24   * @author Jens Kapitza
25   * 
26   */
27  public class AjaxActionHelper {
28      /**
29       * 
30       * Invoke the ajax action and setup the request and response
31       * 
32       * @param action
33       *            the ajaxaction implementation
34       * @param request
35       *            the request
36       * @param response
37       *            the response
38       * @return the xml content from action
39       * @throws Exception
40       */
41      static public String   invoke(BaseAjaxXmlAction action,
42              HttpServletRequest   request, HttpServletResponse   response)
43              throws Exception   {
44          // prepare CALL
45          request.setCharacterEncoding("UTF-8");
46          // Set content to xml
47          response.setContentType("text/xml; charset=UTF-8");
48          // Set standard HTTP/1.1 no-cache headers.
49          response.setHeader("Cache-Control",
50                  "no-store, max-age=0, no-cache, must-revalidate");
51  
52          // Set IE extended HTTP/1.1 no-cache headers.
53          response.addHeader("Cache-Control", "post-check=0, pre-check=0");
54  
55          // Set standard HTTP/1.0 no-cache header.
56          response.setHeader("Pragma", "no-cache");
57  
58          // no cahe
59  
60          return action.getXmlContent(request, response);
61      }
62  }
63
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