Turn any HTML escape entities in the string into characters and return the resulting string. - Java java.lang

Java examples for java.lang:String HTML

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Description

Turn any HTML escape entities in the string into characters and return the resulting string.

Demo Code

/*/*from   w w  w .  j a v  a2s  . c om*/
 * Static String formatting and query routines.
 * Copyright (C) 2001-2005 Stephen Ostermiller
 * http://ostermiller.org/contact.pl?regarding=Java+Utilities
 *
 * 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 2 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.
 *
 * See COPYING.TXT for details.
 */
//package com.java2s;
import java.util.HashMap;

public class Main {
    public static void main(String[] argv) {
        String s = "java2s.com";
        System.out.println(unescapeHTML(s));
    }

    private static HashMap<String, Integer> htmlEntities = new HashMap<String, Integer>();

    /**
     * Turn any HTML escape entities in the string into
     * characters and return the resulting string.
     *
     * @param s String to be unescaped.
     * @return unescaped String.
     * @throws NullPointerException if s is null.
     *
     * @since 1.00.00
     */
    public static String unescapeHTML(String s) {
        StringBuffer result = new StringBuffer(s.length());
        int ampInd = s.indexOf("&");
        int lastEnd = 0;
        while (ampInd >= 0) {
            int nextAmp = s.indexOf("&", ampInd + 1);
            int nextSemi = s.indexOf(";", ampInd + 1);
            if (nextSemi != -1 && (nextAmp == -1 || nextSemi < nextAmp)) {
                int value = -1;
                String escape = s.substring(ampInd + 1, nextSemi);
                try {
                    if (escape.startsWith("#")) {
                        value = Integer.parseInt(escape.substring(1), 10);
                    } else {
                        if (htmlEntities.containsKey(escape)) {
                            value = ((Integer) (htmlEntities.get(escape)))
                                    .intValue();
                        }
                    }
                } catch (NumberFormatException x) {
                }
                result.append(s.substring(lastEnd, ampInd));
                lastEnd = nextSemi + 1;
                if (value >= 0 && value <= 0xffff) {
                    result.append((char) value);
                } else {
                    result.append("&").append(escape).append(";");
                }
            }
            ampInd = nextAmp;
        }
        result.append(s.substring(lastEnd));
        return result.toString();
    }
}

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