HttpTag


1   /*
2    * Copyright 1999,2004 The Apache Software Foundation.
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.apache.taglibs.io;
18  
19  import java.io.BufferedReader  ;
20  import java.io.IOException  ;
21  import java.io.InputStream  ;
22  import java.io.InputStreamReader  ;
23  import java.io.OutputStream  ;
24  import java.io.OutputStreamWriter  ;
25  import java.net.HttpURLConnection  ;
26  import java.net.MalformedURLException  ;
27  import java.net.URL  ;
28  import java.net.URLConnection  ;
29  
30  import javax.servlet.ServletContext  ;
31  import javax.servlet.jsp.JspException  ;
32  import javax.servlet.jsp.JspWriter  ;
33  import javax.servlet.jsp.tagext.BodyContent  ;
34  import javax.servlet.jsp.tagext.TagSupport  ;
35  
36  /** A JSP Custom tag to make a HTTP request and output the response.
37    *
38    * @author <a HREF="mailto:james.strachan@metastuff.com">James Strachan</a>
39    * @version $Revision: 1.2 $
40    */
41  public class HttpTag extends URLTag {
42  
43      /** HTTP request method */
44      private String   action = "GET";
45      
46      public HttpTag() {
47      }
48      
49      // Tag interface
50      //-------------------------------------------------------------------------                        
51      public void release() {
52          super.release();
53          action = null;
54      }
55      
56      
57      // Properties
58      //-------------------------------------------------------------------------                    
59      public void setAction(String   action) {
60          this.action = action;
61          setInput( isInputAction( action ) );
62      }
63  
64      // Implementation methods
65      //-------------------------------------------------------------------------                    
66      protected void configureConnection( HttpURLConnection   connection ) throws IOException   {
67          super.configureConnection(connection);
68          
69          HttpURLConnection   httpConnection = (HttpURLConnection  ) connection;
70          connection.setRequestMethod( action );
71      }
72  
73      /** @return true if the given HTTP action should result in some 
74        * information being sent as part of the request, such as the POST action
75        */
76      protected boolean isInputAction(String   action) {
77          return "POST".equalsIgnoreCase( action ) || "PUT".equalsIgnoreCase( action );
78      }
79  }
80
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