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Java > Open Source Codes > demo > cart > HTMLFilter


1 /*
2 * Copyright 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 demo.cart;
18
19 /**
20  * HTML filter utility.
21  *
22  * @author Craig R. McClanahan
23  * @author Tim Tye
24  * @version $Revision: 1 $ $Date: 2006-11-27 16:46:47 -0800 (Mon, 27 Nov 2006) $
25  */
26
27 public final class HTMLFilter {
28
29
30     /**
31      * Filter the specified message string for characters that are sensitive
32      * in HTML. This avoids potential attacks caused by including JavaScript
33      * codes in the request URL that is often reported in error messages.
34      *
35      * @param message The message string to be filtered
36      */
37     public static String JavaDoc filter(String JavaDoc message) {
38
39         if (message == null)
40             return (null);
41
42         char content[] = new char[message.length()];
43         message.getChars(0, message.length(), content, 0);
44         StringBuffer JavaDoc result = new StringBuffer JavaDoc(content.length + 50);
45         for (int i = 0; i < content.length; i++) {
46             switch (content[i]) {
47             case '<':
48                 result.append("&lt;");
49                 break;
50             case '>':
51                 result.append("&gt;");
52                 break;
53             case '&':
54                 result.append("&amp;");
55                 break;
56             case '"':
57                 result.append("&quot;");
58                 break;
59             default:
60                 result.append(content[i]);
61             }
62         }
63         return (result.toString());
64
65     }
66
67
68 }
69
70
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