Java HTML Encode encodeHTML(String s)

Description

TODO: replace with JTidy or AntiSamy http://jtidy.sourceforge.net/multiproject/jtidyservlet/clover/org/w3c/tidy/servlet/util/HTMLEncode.html

License

Open Source License

Parameter

Parameter	Description
s	a parameter

Declaration

public static String encodeHTML(String s) 

Method Source Code

//package com.java2s;
/*/*from   w w w  . j a v a 2s .c o  m*/
 * Copyright (C) 2012 McEvoy Software Ltd
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.util.HashMap;

public class Main {
    private static HashMap<String, String> entityTableEncode = null;
    private static final String[] ENTITIES = { ">", "&gt;", "<", "&lt;", "&", "&amp;", "\"", "&quot;", "'",
            "&#039;", "\\", "&#092;", "\u00a9", "&copy;", "\u00ae", "&reg;" };

    /**
     * TODO: replace with JTidy or AntiSamy
     * http://jtidy.sourceforge.net/multiproject/jtidyservlet/clover/org/w3c/tidy/servlet/util/HTMLEncode.html
     * 
     *
     * @param s
     * @return
     */
    public static String encodeHTML(String s) {
        //        s = s.replace("& ", "&amp; ");
        //        StringBuilder out = new StringBuilder();
        //        for (int i = 0; i < s.length(); i++) {
        //            char c = s.charAt(i);
        //            if (c > 127 || c == '"' || c == '<' || c == '>') {
        //                out.append("&#" + (int) c + ";");
        //            } else {
        //                out.append(c);
        //            }
        //        }
        //        return out.toString();
        return encode(s, "\n");
    }

    public static String encode(String s, String cr) {
        if (entityTableEncode == null) {
            buildEntityTables();
        }
        if (s == null) {
            return "";
        }
        StringBuilder sb = new StringBuilder(s.length() * 2);
        char ch;
        for (int i = 0; i < s.length(); ++i) {
            ch = s.charAt(i);
            if ((ch >= 48 && ch <= 59) || (ch >= 63 && ch <= 90) || (ch >= 97 && ch <= 122) || (ch == ' ')) {
                sb.append(ch);
            } else if (ch == '\n') {
                sb.append(cr);
            } else {
                // cherry pick some safe non-seq chars
                if (ch == '(' || ch == ')' || ch == '+' || ch == '-' || ch == '*' || ch == '_') {
                    sb.append(ch);
                } else {
                    String chEnc = encodeSingleChar(String.valueOf(ch));
                    if (chEnc != null) {
                        sb.append(chEnc);
                    } else {
                        // Not 7 Bit use the unicode system
                        sb.append("&#");
                        sb.append(new Integer(ch).toString());
                        sb.append(';');
                    }
                }
            }
        }
        return sb.toString();
    }

    protected static synchronized void buildEntityTables() {
        entityTableEncode = new HashMap<String, String>(ENTITIES.length);

        for (int i = 0; i < ENTITIES.length; i += 2) {
            if (!entityTableEncode.containsKey(ENTITIES[i])) {
                entityTableEncode.put(ENTITIES[i], ENTITIES[i + 1]);
            }
        }
    }

    private static String encodeSingleChar(String ch) {
        return (String) entityTableEncode.get(ch);
    }
}

Related

1. encodeHTML(String aText)
2. forHTML(final String aText)
3. forHTML(String aText)
4. forHtmlComplete(final String aText)
5. forHTMLTag(String aTagFragment)