1 /*
2 * $Id: ImageAction.java 471754 2006-11-06 14:55:09Z husted $
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "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
22
23 package org.apache.struts.webapp.exercise;
24
25
26 import org.apache.struts.action.Action;
27 import org.apache.struts.action.ActionForm;
28 import org.apache.struts.action.ActionForward;
29 import org.apache.struts.action.ActionMapping;
30
31 import javax.servlet.http.HttpServletRequest;
32 import javax.servlet.http.HttpServletResponse;
33 import java.io.InputStream;
34 import java.io.OutputStream;
35
36
37 /**
38 * Read image from resource given as ActionMapping parameter
39 * and copy to output stream.
40 *
41 * @version $Rev: 471754 $ $Date: 2006-11-06 08:55:09 -0600 (Mon, 06 Nov 2006) $
42 */
43
44 public class ImageAction extends Action {
45
46
47 /**
48 * Read image from resource given as ActionMapping parameter
49 * and copy to output stream.
50 *
51 * @exception java.lang.Exception on input/output error
52 */
53 public ActionForward execute(
54 ActionMapping mapping,
55 ActionForm form,
56 HttpServletRequest request,
57 HttpServletResponse response)
58 throws Exception {
59
60 // e.g. /$module/struts-power.gif
61 // :FIXME: Should compute module
62 String image = mapping.getParameter();
63
64 byte[] buffer = new byte[2048];
65 int bytesRead;
66 InputStream input =
67 getServlet().getServletContext().getResourceAsStream(image);
68 OutputStream
69 out = response.getOutputStream();
70
71 while ((bytesRead = input.read(buffer)) != -1) {
72 out.write(buffer, 0, bytesRead);
73 }
74 out.close();
75
76 return null;
77 }
78
79 }