Filter message string for characters that are sensitive in HTML : HTML Parser « Development « Java Tutorial






/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License.  You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

/**
 * HTML filter utility.
 *
 * @author Craig R. McClanahan
 * @author Tim Tye
 * @version $Revision: 467217 $ $Date: 2006-10-24 05:14:34 +0200 (mar., 24 oct. 2006) $
 */

public final class HTMLFilter {


    /**
     * Filter the specified message string for characters that are sensitive
     * in HTML.  This avoids potential attacks caused by including JavaScript
     * codes in the request URL that is often reported in error messages.
     *
     * @param message The message string to be filtered
     */
    public static String filter(String message) {

        if (message == null)
            return (null);

        char content[] = new char[message.length()];
        message.getChars(0, message.length(), content, 0);
        StringBuffer result = new StringBuffer(content.length + 50);
        for (int i = 0; i < content.length; i++) {
            switch (content[i]) {
            case '<':
                result.append("&lt;");
                break;
            case '>':
                result.append("&gt;");
                break;
            case '&':
                result.append("&amp;");
                break;
            case '"':
                result.append("&quot;");
                break;
            default:
                result.append(content[i]);
            }
        }
        return (result.toString());

    }


}








6.31.HTML Parser
6.31.1.List Tags
6.31.2.html parser DTD
6.31.3.Use javax.swing.text.html.HTMLEditorKit to parse HTML
6.31.4.extends HTMLEditorKit.ParserCallback
6.31.5.Parse HTML
6.31.6.Convert to HTML string
6.31.7.Escape HTML
6.31.8.Filter message string for characters that are sensitive in HTML
6.31.9.Filter the specified message string for characters that are sensitive in HTML
6.31.10.HTML color names
6.31.11.Text To HTML
6.31.12.Unescape HTML
6.31.13.Utility methods for dealing with HTML
6.31.14.insert HTML block dynamically
6.31.15.A collection of all character entites defined in the HTML4 standard.
6.31.16.Decode an HTML color string like '#F567BA;' into a Color