SimpleServletHandlerAdapter


1   /*
2    * Copyright 2002-2005 the original author or authors.
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  
17  package org.springframework.web.servlet.handler;
18  
19  import javax.servlet.Servlet  ;
20  import javax.servlet.http.HttpServletRequest  ;
21  import javax.servlet.http.HttpServletResponse  ;
22  
23  import org.springframework.web.servlet.HandlerAdapter;
24  import org.springframework.web.servlet.ModelAndView;
25  
26  /**
27   * Adapter to use the Servlet interface with the generic DispatcherServlet.
28   * Calls the Servlet's <code>service</code> method to handle a request.
29   *
30   * <p>Last-modified checking is not explicitly supported: This is typically
31   * handled by the Servlet implementation itself (usually deriving from
32   * the HttpServlet base class).
33   *
34   * <p>This adapter is not activated by default; it needs to be defined as a
35   * bean in the DispatcherServlet context. It will automatically apply to
36   * mapped handler beans that implement the Servlet interface then.
37   *
38   * <p>Note that Servlet instances defined as bean will not receive initialization
39   * and destruction callbacks, unless a special post-processor such as
40   * SimpleServletPostProcessor is defined in the DispatcherServlet context.
41   *
42   * <p><b>Alternatively, consider wrapping a Servlet with Spring's
43   * ServletWrappingController.</b> This is particularly appropriate for
44   * existing Servlet classes, allowing to specify Servlet initialization
45   * parameters etc.
46   *
47   * @author Juergen Hoeller
48   * @since 1.1.5
49   * @see javax.servlet.Servlet
50   * @see javax.servlet.http.HttpServlet
51   * @see SimpleServletPostProcessor
52   * @see org.springframework.web.servlet.mvc.ServletWrappingController
53   */
54  public class SimpleServletHandlerAdapter implements HandlerAdapter {
55  
56      public boolean supports(Object   handler) {
57          return (handler instanceof Servlet  );
58      }
59  
60      public ModelAndView handle(HttpServletRequest   request, HttpServletResponse   response, Object   handler)
61              throws Exception   {
62          
63          ((Servlet  ) handler).service(request, response);
64          return null;
65      }
66  
67      public long getLastModified(HttpServletRequest   request, Object   handler) {
68          return -1;
69      }
70  
71  }
72
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