Unescape HTML : HTML Output « Servlets « Java

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Java » Servlets » HTML OutputScreenshots 
Unescape HTML
   
/*
 * 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.
 */


import java.util.HashMap;
import java.util.regex.Pattern;

/**
 * Utilities for String formatting, manipulation, and queries.
 * More information about this class is available from <a target="_top" href=
 * "http://ostermiller.org/utils/StringHelper.html">ostermiller.org</a>.
 *
 @author Stephen Ostermiller http://ostermiller.org/contact.pl?regarding=Java+Utilities
 @since ostermillerutils 1.00.00
 */
public class StringHelper {
  private static HashMap<String,Integer> htmlEntities = new HashMap<String,Integer>();
  static {
    htmlEntities.put("nbsp"new Integer(160));
    htmlEntities.put("iexcl"new Integer(161));
    htmlEntities.put("cent"new Integer(162));
    htmlEntities.put("pound"new Integer(163));
    htmlEntities.put("curren"new Integer(164));
    htmlEntities.put("yen"new Integer(165));
    htmlEntities.put("brvbar"new Integer(166));
    htmlEntities.put("sect"new Integer(167));
    htmlEntities.put("uml"new Integer(168));
    htmlEntities.put("copy"new Integer(169));
    htmlEntities.put("ordf"new Integer(170));
    htmlEntities.put("laquo"new Integer(171));
    htmlEntities.put("not"new Integer(172));
    htmlEntities.put("shy"new Integer(173));
    htmlEntities.put("reg"new Integer(174));
    htmlEntities.put("macr"new Integer(175));
    htmlEntities.put("deg"new Integer(176));
    htmlEntities.put("plusmn"new Integer(177));
    htmlEntities.put("sup2"new Integer(178));
    htmlEntities.put("sup3"new Integer(179));
    htmlEntities.put("acute"new Integer(180));
    htmlEntities.put("micro"new Integer(181));
    htmlEntities.put("para"new Integer(182));
    htmlEntities.put("middot"new Integer(183));
    htmlEntities.put("cedil"new Integer(184));
    htmlEntities.put("sup1"new Integer(185));
    htmlEntities.put("ordm"new Integer(186));
    htmlEntities.put("raquo"new Integer(187));
    htmlEntities.put("frac14"new Integer(188));
    htmlEntities.put("frac12"new Integer(189));
    htmlEntities.put("frac34"new Integer(190));
    htmlEntities.put("iquest"new Integer(191));
    htmlEntities.put("Agrave"new Integer(192));
    htmlEntities.put("Aacute"new Integer(193));
    htmlEntities.put("Acirc"new Integer(194));
    htmlEntities.put("Atilde"new Integer(195));
    htmlEntities.put("Auml"new Integer(196));
    htmlEntities.put("Aring"new Integer(197));
    htmlEntities.put("AElig"new Integer(198));
    htmlEntities.put("Ccedil"new Integer(199));
    htmlEntities.put("Egrave"new Integer(200));
    htmlEntities.put("Eacute"new Integer(201));
    htmlEntities.put("Ecirc"new Integer(202));
    htmlEntities.put("Euml"new Integer(203));
    htmlEntities.put("Igrave"new Integer(204));
    htmlEntities.put("Iacute"new Integer(205));
    htmlEntities.put("Icirc"new Integer(206));
    htmlEntities.put("Iuml"new Integer(207));
    htmlEntities.put("ETH"new Integer(208));
    htmlEntities.put("Ntilde"new Integer(209));
    htmlEntities.put("Ograve"new Integer(210));
    htmlEntities.put("Oacute"new Integer(211));
    htmlEntities.put("Ocirc"new Integer(212));
    htmlEntities.put("Otilde"new Integer(213));
    htmlEntities.put("Ouml"new Integer(214));
    htmlEntities.put("times"new Integer(215));
    htmlEntities.put("Oslash"new Integer(216));
    htmlEntities.put("Ugrave"new Integer(217));
    htmlEntities.put("Uacute"new Integer(218));
    htmlEntities.put("Ucirc"new Integer(219));
    htmlEntities.put("Uuml"new Integer(220));
    htmlEntities.put("Yacute"new Integer(221));
    htmlEntities.put("THORN"new Integer(222));
    htmlEntities.put("szlig"new Integer(223));
    htmlEntities.put("agrave"new Integer(224));
    htmlEntities.put("aacute"new Integer(225));
    htmlEntities.put("acirc"new Integer(226));
    htmlEntities.put("atilde"new Integer(227));
    htmlEntities.put("auml"new Integer(228));
    htmlEntities.put("aring"new Integer(229));
    htmlEntities.put("aelig"new Integer(230));
    htmlEntities.put("ccedil"new Integer(231));
    htmlEntities.put("egrave"new Integer(232));
    htmlEntities.put("eacute"new Integer(233));
    htmlEntities.put("ecirc"new Integer(234));
    htmlEntities.put("euml"new Integer(235));
    htmlEntities.put("igrave"new Integer(236));
    htmlEntities.put("iacute"new Integer(237));
    htmlEntities.put("icirc"new Integer(238));
    htmlEntities.put("iuml"new Integer(239));
    htmlEntities.put("eth"new Integer(240));
    htmlEntities.put("ntilde"new Integer(241));
    htmlEntities.put("ograve"new Integer(242));
    htmlEntities.put("oacute"new Integer(243));
    htmlEntities.put("ocirc"new Integer(244));
    htmlEntities.put("otilde"new Integer(245));
    htmlEntities.put("ouml"new Integer(246));
    htmlEntities.put("divide"new Integer(247));
    htmlEntities.put("oslash"new Integer(248));
    htmlEntities.put("ugrave"new Integer(249));
    htmlEntities.put("uacute"new Integer(250));
    htmlEntities.put("ucirc"new Integer(251));
    htmlEntities.put("uuml"new Integer(252));
    htmlEntities.put("yacute"new Integer(253));
    htmlEntities.put("thorn"new Integer(254));
    htmlEntities.put("yuml"new Integer(255));
    htmlEntities.put("fnof"new Integer(402));
    htmlEntities.put("Alpha"new Integer(913));
    htmlEntities.put("Beta"new Integer(914));
    htmlEntities.put("Gamma"new Integer(915));
    htmlEntities.put("Delta"new Integer(916));
    htmlEntities.put("Epsilon"new Integer(917));
    htmlEntities.put("Zeta"new Integer(918));
    htmlEntities.put("Eta"new Integer(919));
    htmlEntities.put("Theta"new Integer(920));
    htmlEntities.put("Iota"new Integer(921));
    htmlEntities.put("Kappa"new Integer(922));
    htmlEntities.put("Lambda"new Integer(923));
    htmlEntities.put("Mu"new Integer(924));
    htmlEntities.put("Nu"new Integer(925));
    htmlEntities.put("Xi"new Integer(926));
    htmlEntities.put("Omicron"new Integer(927));
    htmlEntities.put("Pi"new Integer(928));
    htmlEntities.put("Rho"new Integer(929));
    htmlEntities.put("Sigma"new Integer(931));
    htmlEntities.put("Tau"new Integer(932));
    htmlEntities.put("Upsilon"new Integer(933));
    htmlEntities.put("Phi"new Integer(934));
    htmlEntities.put("Chi"new Integer(935));
    htmlEntities.put("Psi"new Integer(936));
    htmlEntities.put("Omega"new Integer(937));
    htmlEntities.put("alpha"new Integer(945));
    htmlEntities.put("beta"new Integer(946));
    htmlEntities.put("gamma"new Integer(947));
    htmlEntities.put("delta"new Integer(948));
    htmlEntities.put("epsilon"new Integer(949));
    htmlEntities.put("zeta"new Integer(950));
    htmlEntities.put("eta"new Integer(951));
    htmlEntities.put("theta"new Integer(952));
    htmlEntities.put("iota"new Integer(953));
    htmlEntities.put("kappa"new Integer(954));
    htmlEntities.put("lambda"new Integer(955));
    htmlEntities.put("mu"new Integer(956));
    htmlEntities.put("nu"new Integer(957));
    htmlEntities.put("xi"new Integer(958));
    htmlEntities.put("omicron"new Integer(959));
    htmlEntities.put("pi"new Integer(960));
    htmlEntities.put("rho"new Integer(961));
    htmlEntities.put("sigmaf"new Integer(962));
    htmlEntities.put("sigma"new Integer(963));
    htmlEntities.put("tau"new Integer(964));
    htmlEntities.put("upsilon"new Integer(965));
    htmlEntities.put("phi"new Integer(966));
    htmlEntities.put("chi"new Integer(967));
    htmlEntities.put("psi"new Integer(968));
    htmlEntities.put("omega"new Integer(969));
    htmlEntities.put("thetasym"new Integer(977));
    htmlEntities.put("upsih"new Integer(978));
    htmlEntities.put("piv"new Integer(982));
    htmlEntities.put("bull"new Integer(8226));
    htmlEntities.put("hellip"new Integer(8230));
    htmlEntities.put("prime"new Integer(8242));
    htmlEntities.put("Prime"new Integer(8243));
    htmlEntities.put("oline"new Integer(8254));
    htmlEntities.put("frasl"new Integer(8260));
    htmlEntities.put("weierp"new Integer(8472));
    htmlEntities.put("image"new Integer(8465));
    htmlEntities.put("real"new Integer(8476));
    htmlEntities.put("trade"new Integer(8482));
    htmlEntities.put("alefsym"new Integer(8501));
    htmlEntities.put("larr"new Integer(8592));
    htmlEntities.put("uarr"new Integer(8593));
    htmlEntities.put("rarr"new Integer(8594));
    htmlEntities.put("darr"new Integer(8595));
    htmlEntities.put("harr"new Integer(8596));
    htmlEntities.put("crarr"new Integer(8629));
    htmlEntities.put("lArr"new Integer(8656));
    htmlEntities.put("uArr"new Integer(8657));
    htmlEntities.put("rArr"new Integer(8658));
    htmlEntities.put("dArr"new Integer(8659));
    htmlEntities.put("hArr"new Integer(8660));
    htmlEntities.put("forall"new Integer(8704));
    htmlEntities.put("part"new Integer(8706));
    htmlEntities.put("exist"new Integer(8707));
    htmlEntities.put("empty"new Integer(8709));
    htmlEntities.put("nabla"new Integer(8711));
    htmlEntities.put("isin"new Integer(8712));
    htmlEntities.put("notin"new Integer(8713));
    htmlEntities.put("ni"new Integer(8715));
    htmlEntities.put("prod"new Integer(8719));
    htmlEntities.put("sum"new Integer(8721));
    htmlEntities.put("minus"new Integer(8722));
    htmlEntities.put("lowast"new Integer(8727));
    htmlEntities.put("radic"new Integer(8730));
    htmlEntities.put("prop"new Integer(8733));
    htmlEntities.put("infin"new Integer(8734));
    htmlEntities.put("ang"new Integer(8736));
    htmlEntities.put("and"new Integer(8743));
    htmlEntities.put("or"new Integer(8744));
    htmlEntities.put("cap"new Integer(8745));
    htmlEntities.put("cup"new Integer(8746));
    htmlEntities.put("int"new Integer(8747));
    htmlEntities.put("there4"new Integer(8756));
    htmlEntities.put("sim"new Integer(8764));
    htmlEntities.put("cong"new Integer(8773));
    htmlEntities.put("asymp"new Integer(8776));
    htmlEntities.put("ne"new Integer(8800));
    htmlEntities.put("equiv"new Integer(8801));
    htmlEntities.put("le"new Integer(8804));
    htmlEntities.put("ge"new Integer(8805));
    htmlEntities.put("sub"new Integer(8834));
    htmlEntities.put("sup"new Integer(8835));
    htmlEntities.put("nsub"new Integer(8836));
    htmlEntities.put("sube"new Integer(8838));
    htmlEntities.put("supe"new Integer(8839));
    htmlEntities.put("oplus"new Integer(8853));
    htmlEntities.put("otimes"new Integer(8855));
    htmlEntities.put("perp"new Integer(8869));
    htmlEntities.put("sdot"new Integer(8901));
    htmlEntities.put("lceil"new Integer(8968));
    htmlEntities.put("rceil"new Integer(8969));
    htmlEntities.put("lfloor"new Integer(8970));
    htmlEntities.put("rfloor"new Integer(8971));
    htmlEntities.put("lang"new Integer(9001));
    htmlEntities.put("rang"new Integer(9002));
    htmlEntities.put("loz"new Integer(9674));
    htmlEntities.put("spades"new Integer(9824));
    htmlEntities.put("clubs"new Integer(9827));
    htmlEntities.put("hearts"new Integer(9829));
    htmlEntities.put("diams"new Integer(9830));
    htmlEntities.put("quot"new Integer(34));
    htmlEntities.put("amp"new Integer(38));
    htmlEntities.put("lt"new Integer(60));
    htmlEntities.put("gt"new Integer(62));
    htmlEntities.put("OElig"new Integer(338));
    htmlEntities.put("oelig"new Integer(339));
    htmlEntities.put("Scaron"new Integer(352));
    htmlEntities.put("scaron"new Integer(353));
    htmlEntities.put("Yuml"new Integer(376));
    htmlEntities.put("circ"new Integer(710));
    htmlEntities.put("tilde"new Integer(732));
    htmlEntities.put("ensp"new Integer(8194));
    htmlEntities.put("emsp"new Integer(8195));
    htmlEntities.put("thinsp"new Integer(8201));
    htmlEntities.put("zwnj"new Integer(8204));
    htmlEntities.put("zwj"new Integer(8205));
    htmlEntities.put("lrm"new Integer(8206));
    htmlEntities.put("rlm"new Integer(8207));
    htmlEntities.put("ndash"new Integer(8211));
    htmlEntities.put("mdash"new Integer(8212));
    htmlEntities.put("lsquo"new Integer(8216));
    htmlEntities.put("rsquo"new Integer(8217));
    htmlEntities.put("sbquo"new Integer(8218));
    htmlEntities.put("ldquo"new Integer(8220));
    htmlEntities.put("rdquo"new Integer(8221));
    htmlEntities.put("bdquo"new Integer(8222));
    htmlEntities.put("dagger"new Integer(8224));
    htmlEntities.put("Dagger"new Integer(8225));
    htmlEntities.put("permil"new Integer(8240));
    htmlEntities.put("lsaquo"new Integer(8249));
    htmlEntities.put("rsaquo"new Integer(8250));
    htmlEntities.put("euro"new Integer(8364));
  }

  /**
   * 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 ostermillerutils 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 != -&& (nextAmp == -|| 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 >= && 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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