1 /*
2 * $Id$
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 java.io.InputStream;
27 import java.io.OutputStream;
28
29 import jakarta.servlet.http.HttpServletRequest;
30 import jakarta.servlet.http.HttpServletResponse;
31
32 import org.apache.struts.action.Action;
33 import org.apache.struts.action.ActionForm;
34 import org.apache.struts.action.ActionForward;
35 import org.apache.struts.action.ActionMapping;
36
37
38 /**
39 * Read image from resource given as ActionMapping parameter
40 * and copy to output stream.
41 *
42 * @version $Rev$ $Date$
43 */
44
45 public class ImageAction extends Action {
46 private static final long serialVersionUID = -917797528635967028L;
47
48
49 /**
50 * Read image from resource given as ActionMapping parameter
51 * and copy to output stream.
52 *
53 * @exception java.lang.Exception on input/output error
54 */
55 public ActionForward execute(
56 ActionMapping mapping,
57 ActionForm form,
58 HttpServletRequest request,
59 HttpServletResponse response)
60 throws Exception {
61
62 // e.g. /$module/struts-power.gif
63 // :FIXME: Should compute module
64 String image = mapping.getParameter();
65
66 byte[] buffer = new byte[2048];
67 int bytesRead;
68
69 try (InputStream input = getServlet().getServletContext().getResourceAsStream(image)) {
70 final OutputStream out = response.getOutputStream();
71
72 while ((bytesRead = input.read(buffer)) != -1) {
73 out.write(buffer, 0, bytesRead);
74 }
75 }
76
77 return null;
78 }
79 }