开发学院WEB开发Jsp Java的HTMLDecoder,将HTML特殊字符解码还原 阅读

Java的HTMLDecoder,将HTML特殊字符解码还原

 2009-02-08 20:51:35 来源:WEB开发网   
核心提示:package com.laozizhu.search.util; import java.util.HashMap; /** * 替换HTMl里面的字符 e.g.: < > " å И 水 * * @author 老紫竹(laozizhu.com) */ pu

package com.laozizhu.search.util; 
 
import java.util.HashMap; 
 
/** 
 * 替换HTMl里面的字符 e.g.: < > " å И 水 
 * 
 * @author 老紫竹(laozizhu.com) 
 */ 
public class HTMLDecoder { 
 
  public static final HashMap<String, Character> charTable; 
 
  public static String decode(String s) { 
   String t; 
   Character ch; 
   int tmpPos, i; 
 
   int maxPos = s.length(); 
   StringBuffer sb = new StringBuffer(maxPos); 
   int curPos = 0; 
   while (curPos < maxPos) { 
    char c = s.charAt(curPos++); 
    if (c == '&') { 
     tmpPos = curPos; 
     if (tmpPos < maxPos) { 
      char d = s.charAt(tmpPos++); 
      if (d == '#') { 
       if (tmpPos < maxPos) { 
        d = s.charAt(tmpPos++); 
        if ((d == 'x') || (d == 'X')) { 
         if (tmpPos < maxPos) { 
          d = s.charAt(tmpPos++); 
          if (isHexDigit(d)) { 
           while (tmpPos < maxPos) { 
            d = s.charAt(tmpPos++); 
            if (!isHexDigit(d)) { 
             if (d == ';') { 
              t = s.substring(curPos + 2, tmpPos - 1); 
              try { 
               i = Integer.parseInt(t, 16); 
               if ((i >= 0) && (i < 65536)) { 
                c = (char) i; 
                curPos = tmpPos; 
               } 
              } catch (NumberFormatException e) { 
              } 
             } 
             break; 
            } 
           } 
          } 
         } 
        } else if (isDigit(d)) { 
         while (tmpPos < maxPos) { 
          d = s.charAt(tmpPos++); 
          if (!isDigit(d)) { 
           if (d == ';') { 
            t = s.substring(curPos + 1, tmpPos - 1); 
            try { 
             i = Integer.parseInt(t); 
             if ((i >= 0) && (i < 65536)) { 
              c = (char) i; 
              curPos = tmpPos; 
             } 
            } catch (NumberFormatException e) { 
            } 
           } 
           break; 
          } 
         } 
        } 
       } 
      } else if (isLetter(d)) { 
       while (tmpPos < maxPos) { 
        d = s.charAt(tmpPos++); 
        if (!isLetterOrDigit(d)) { 
         if (d == ';') { 
          t = s.substring(curPos, tmpPos - 1); 
          ch = (Character) charTable.get(t); 
          if (ch != null) { 
           c = ch.charValue(); 
           curPos = tmpPos; 
          } 
         } 
         break; 
        } 
       } 
      } 
     } 
    } 
    sb.append(c); 
   } 
   return sb.toString(); 
  } 
 
  PRivate static boolean isLetterOrDigit(char c) { 
   return isLetter(c) || isDigit(c); 
  } 
 
  private static boolean isHexDigit(char c) { 
   return isHexLetter(c) || isDigit(c); 
  } 
 
  private static boolean isLetter(char c) { 
   return ((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z')); 
  } 
 
  private static boolean isHexLetter(char c) { 
   return ((c >= 'a') && (c <= 'f')) || ((c >= 'A') && (c <= 'F')); 
  } 
 
  private static boolean isDigit(char c) { 
   return (c >= '0') && (c <= '9'); 
  } 
 
  public static String compact(String s) { 
   int maxPos = s.length(); 
   StringBuffer sb = new StringBuffer(maxPos); 
   int curPos = 0; 
   while (curPos < maxPos) { 
    char c = s.charAt(curPos++); 
    if (isWhitespace(c)) { 
     while ((curPos < maxPos) && isWhitespace(s.charAt(curPos))) { 
      curPos++; 
     } 
     c = '\u0020'; 
    } 
    sb.append(c); 
   } 
   return sb.toString(); 
  } 
 
  // HTML is very particular about what constitutes white space. 
  public static boolean isWhitespace(char ch) { 
   return (ch == '\u0020') || (ch == '\r') || (ch == '\n') || (ch == '\u0009') || (ch == '\u000c') || (ch == '\u200b'); 
  } 
 
  static { 
   charTable = new HashMap<String, Character>(); 
   charTable.put("quot", new Character((char) 34)); 
   charTable.put("amp", new Character((char) 38)); 
   charTable.put("apos", new Character((char) 39)); 
   charTable.put("lt", new Character((char) 60)); 
   charTable.put("gt", new Character((char) 62)); 
   charTable.put("nbsp", new Character((char) 160)); 
   charTable.put("iexcl", new Character((char) 161)); 
   charTable.put("cent", new Character((char) 162)); 
   charTable.put("pound", new Character((char) 163)); 
   charTable.put("curren", new Character((char) 164)); 
   charTable.put("yen", new Character((char) 165)); 
   charTable.put("brvbar", new Character((char) 166)); 
   charTable.put("sect", new Character((char) 167)); 
   charTable.put("uml", new Character((char) 168)); 
   charTable.put("copy", new Character((char) 169)); 
   charTable.put("ordf", new Character((char) 170)); 
   charTable.put("laquo", new Character((char) 171)); 
   charTable.put("not", new Character((char) 172)); 
   charTable.put("shy", new Character((char) 173)); 
   charTable.put("reg", new Character((char) 174)); 
   charTable.put("macr", new Character((char) 175)); 
   charTable.put("deg", new Character((char) 176)); 
   charTable.put("plusmn", new Character((char) 177)); 
   charTable.put("sup2", new Character((char) 178)); 
   charTable.put("sup3", new Character((char) 179)); 
   charTable.put("acute", new Character((char) 180)); 
   charTable.put("micro", new Character((char) 181)); 
   charTable.put("para", new Character((char) 182)); 
   charTable.put("middot", new Character((char) 183)); 
   charTable.put("cedil", new Character((char) 184)); 
   charTable.put("sup1", new Character((char) 185)); 
   charTable.put("ordm", new Character((char) 186)); 
   charTable.put("raquo", new Character((char) 187)); 
   charTable.put("frac14", new Character((char) 188)); 
   charTable.put("frac12", new Character((char) 189)); 
   charTable.put("frac34", new Character((char) 190)); 
   charTable.put("iquest", new Character((char) 191)); 
   charTable.put("Agrave", new Character((char) 192)); 
   charTable.put("Aacute", new Character((char) 193)); 
   charTable.put("Acirc", new Character((char) 194)); 
   charTable.put("Atilde", new Character((char) 195)); 
   charTable.put("Auml", new Character((char) 196)); 
   charTable.put("Aring", new Character((char) 197)); 
   charTable.put("AElig", new Character((char) 198)); 
   charTable.put("Ccedil", new Character((char) 199)); 
   charTable.put("Egrave", new Character((char) 200)); 
   charTable.put("Eacute", new Character((char) 201)); 
   charTable.put("Ecirc", new Character((char) 202)); 
   charTable.put("Euml", new Character((char) 203)); 
   charTable.put("Igrave", new Character((char) 204)); 
   charTable.put("Iacute", new Character((char) 205)); 
   charTable.put("Icirc", new Character((char) 206)); 
   charTable.put("Iuml", new Character((char) 207)); 
   charTable.put("ETH", new Character((char) 208)); 
   charTable.put("Ntilde", new Character((char) 209)); 
   charTable.put("Ograve", new Character((char) 210)); 
   charTable.put("Oacute", new Character((char) 211)); 
   charTable.put("Ocirc", new Character((char) 212)); 
   charTable.put("Otilde", new Character((char) 213)); 
   charTable.put("Ouml", new Character((char) 214)); 
   charTable.put("times", new Character((char) 215)); 
   charTable.put("Oslash", new Character((char) 216)); 
   charTable.put("Ugrave", new Character((char) 217)); 
   charTable.put("Uacute", new Character((char) 218)); 
   charTable.put("Ucirc", new Character((char) 219)); 
   charTable.put("Uuml", new Character((char) 220)); 
   charTable.put("Yacute", new Character((char) 221)); 
   charTable.put("THORN", new Character((char) 222)); 
   charTable.put("szlig", new Character((char) 223)); 
   charTable.put("agrave", new Character((char) 224)); 
   charTable.put("aacute", new Character((char) 225)); 
   charTable.put("acirc", new Character((char) 226)); 
   charTable.put("atilde", new Character((char) 227)); 
   charTable.put("auml", new Character((char) 228)); 
   charTable.put("aring", new Character((char) 229)); 
   charTable.put("aelig", new Character((char) 230)); 
   charTable.put("ccedil", new Character((char) 231)); 
   charTable.put("egrave", new Character((char) 232)); 
   charTable.put("eacute", new Character((char) 233)); 
   charTable.put("ecirc", new Character((char) 234)); 
   charTable.put("euml", new Character((char) 235)); 
   charTable.put("igrave", new Character((char) 236)); 
   charTable.put("iacute", new Character((char) 237)); 
   charTable.put("icirc", new Character((char) 238)); 
   charTable.put("iuml", new Character((char) 239)); 
   charTable.put("eth", new Character((char) 240)); 
   charTable.put("ntilde", new Character((char) 241)); 
   charTable.put("ograve", new Character((char) 242)); 
   charTable.put("oacute", new Character((char) 243)); 
   charTable.put("ocirc", new Character((char) 244)); 
   charTable.put("otilde", new Character((char) 245)); 
   charTable.put("ouml", new Character((char) 246)); 
   charTable.put("divide", new Character((char) 247)); 
   charTable.put("oslash", new Character((char) 248)); 
   charTable.put("ugrave", new Character((char) 249)); 
   charTable.put("uacute", new Character((char) 250)); 
   charTable.put("ucirc", new Character((char) 251)); 
   charTable.put("uuml", new Character((char) 252)); 
   charTable.put("yacute", new Character((char) 253)); 
   charTable.put("thorn", new Character((char) 254)); 
   charTable.put("yuml", new Character((char) 255)); 
   charTable.put("OElig", new Character((char) 338)); 
   charTable.put("oelig", new Character((char) 339)); 
   charTable.put("Scaron", new Character((char) 352)); 
   charTable.put("scaron", new Character((char) 353)); 
   charTable.put("fnof", new Character((char) 402)); 
   charTable.put("circ", new Character((char) 710)); 
   charTable.put("tilde", new Character((char) 732)); 
   charTable.put("Alpha", new Character((char) 913)); 
   charTable.put("Beta", new Character((char) 914)); 
   charTable.put("Gamma", new Character((char) 915)); 
   charTable.put("Delta", new Character((char) 916)); 
   charTable.put("Epsilon", new Character((char) 917)); 
   charTable.put("Zeta", new Character((char) 918)); 
   charTable.put("Eta", new Character((char) 919)); 
   charTable.put("Theta", new Character((char) 920)); 
   charTable.put("Iota", new Character((char) 921)); 
   charTable.put("Kappa", new Character((char) 922)); 
   charTable.put("Lambda", new Character((char) 923)); 
   charTable.put("Mu", new Character((char) 924)); 
   charTable.put("Nu", new Character((char) 925)); 
   charTable.put("Xi", new Character((char) 926)); 
   charTable.put("Omicron", new Character((char) 927)); 
   charTable.put("Pi", new Character((char) 928)); 
   charTable.put("Rho", new Character((char) 929)); 
   charTable.put("Sigma", new Character((char) 931)); 
   charTable.put("Tau", new Character((char) 932)); 
   charTable.put("Upsilon", new Character((char) 933)); 
   charTable.put("Phi", new Character((char) 934)); 
   charTable.put("Chi", new Character((char) 935)); 
   charTable.put("Psi", new Character((char) 936)); 
   charTable.put("Omega", new Character((char) 937)); 
   charTable.put("alpha", new Character((char) 945)); 
   charTable.put("beta", new Character((char) 946)); 
   charTable.put("gamma", new Character((char) 947)); 
   charTable.put("delta", new Character((char) 948)); 
   charTable.put("epsilon", new Character((char) 949)); 
   charTable.put("zeta", new Character((char) 950)); 
   charTable.put("eta", new Character((char) 951)); 
   charTable.put("theta", new Character((char) 952)); 
   charTable.put("iota", new Character((char) 953)); 
   charTable.put("kappa", new Character((char) 954)); 
   charTable.put("lambda", new Character((char) 955)); 
   charTable.put("mu", new Character((char) 956)); 
   charTable.put("nu", new Character((char) 957)); 
   charTable.put("xi", new Character((char) 958)); 
   charTable.put("omicron", new Character((char) 959)); 
   charTable.put("pi", new Character((char) 960)); 
   charTable.put("rho", new Character((char) 961)); 
   charTable.put("sigmaf", new Character((char) 962)); 
   charTable.put("sigma", new Character((char) 963)); 
   charTable.put("tau", new Character((char) 964)); 
   charTable.put("upsilon", new Character((char) 965)); 
   charTable.put("phi", new Character((char) 966)); 
   charTable.put("chi", new Character((char) 967)); 
   charTable.put("psi", new Character((char) 968)); 
   charTable.put("omega", new Character((char) 969)); 
   charTable.put("thetasym", new Character((char) 977)); 
   charTable.put("upsih", new Character((char) 978)); 
   charTable.put("piv", new Character((char) 982)); 
   charTable.put("ensp", new Character((char) 8194)); 
   charTable.put("emsp", new Character((char) 8195)); 
   charTable.put("thinsp", new Character((char) 8201)); 
   charTable.put("zwnj", new Character((char) 8204)); 
   charTable.put("zwj", new Character((char) 8205)); 
   charTable.put("lrm", new Character((char) 8206)); 
   charTable.put("rlm", new Character((char) 8207)); 
   charTable.put("ndash", new Character((char) 8211)); 
   charTable.put("mdash", new Character((char) 8212)); 
   charTable.put("lsquo", new Character((char) 8216)); 
   charTable.put("rsquo", new Character((char) 8217)); 
   charTable.put("sbquo", new Character((char) 8218)); 
   charTable.put("ldquo", new Character((char) 8220)); 
   charTable.put("rdquo", new Character((char) 8221)); 
   charTable.put("bdquo", new Character((char) 8222)); 
   charTable.put("dagger", new Character((char) 8224)); 
   charTable.put("Dagger", new Character((char) 8225)); 
   charTable.put("bull", new Character((char) 8226)); 
   charTable.put("hellip", new Character((char) 8230)); 
   charTable.put("permil", new Character((char) 8240)); 
   charTable.put("prime", new Character((char) 8242)); 
   charTable.put("Prime", new Character((char) 8243)); 
   charTable.put("lsaquo", new Character((char) 8249)); 
   charTable.put("rsaquo", new Character((char) 8250)); 
   charTable.put("oline", new Character((char) 8254)); 
   charTable.put("frasl", new Character((char) 8260)); 
   charTable.put("euro", new Character((char) 8364)); 
   charTable.put("image", new Character((char) 8465)); 
   charTable.put("weierp", new Character((char) 8472)); 
   charTable.put("real", new Character((char) 8476)); 
   charTable.put("trade", new Character((char) 8482)); 
   charTable.put("alefsym", new Character((char) 8501)); 
   charTable.put("larr", new Character((char) 8592)); 
   charTable.put("uarr", new Character((char) 8593)); 
   charTable.put("rarr", new Character((char) 8594)); 
   charTable.put("darr", new Character((char) 8595)); 
   charTable.put("harr", new Character((char) 8596)); 
   charTable.put("crarr", new Character((char) 8629)); 
   charTable.put("lArr", new Character((char) 8656)); 
   charTable.put("uArr", new Character((char) 8657)); 
   charTable.put("rArr", new Character((char) 8658)); 
   charTable.put("dArr", new Character((char) 8659)); 
   charTable.put("hArr", new Character((char) 8660)); 
   charTable.put("forall", new Character((char) 8704)); 
   charTable.put("part", new Character((char) 8706)); 
   charTable.put("exist", new Character((char) 8707)); 
   charTable.put("empty", new Character((char) 8709)); 
   charTable.put("nabla", new Character((char) 8711)); 
   charTable.put("isin", new Character((char) 8712)); 
   charTable.put("notin", new Character((char) 8713)); 
   charTable.put("ni", new Character((char) 8715)); 
   charTable.put("prod", new Character((char) 8719)); 
   charTable.put("sum", new Character((char) 8721)); 
   charTable.put("minus", new Character((char) 8722)); 
   charTable.put("lowast", new Character((char) 8727)); 
   charTable.put("radic", new Character((char) 8730)); 
   charTable.put("prop", new Character((char) 8733)); 
   charTable.put("infin", new Character((char) 8734)); 
   charTable.put("ang", new Character((char) 8736)); 
   charTable.put("and", new Character((char) 8743)); 
   charTable.put("or", new Character((char) 8744)); 
   charTable.put("cap", new Character((char) 8745)); 
   charTable.put("cup", new Character((char) 8746)); 
   charTable.put("int", new Character((char) 8747)); 
   charTable.put("there4", new Character((char) 8756)); 
   charTable.put("sim", new Character((char) 8764)); 
   charTable.put("cong", new Character((char) 8773)); 
   charTable.put("asymp", new Character((char) 8776)); 
   charTable.put("ne", new Character((char) 8800)); 
   charTable.put("equiv", new Character((char) 8801)); 
   charTable.put("le", new Character((char) 8804)); 
   charTable.put("ge", new Character((char) 8805)); 
   charTable.put("sub", new Character((char) 8834)); 
   charTable.put("sup", new Character((char) 8835)); 
   charTable.put("nsub", new Character((char) 8836)); 
   charTable.put("sube", new Character((char) 8838)); 
   charTable.put("supe", new Character((char) 8839)); 
   charTable.put("oplus", new Character((char) 8853)); 
   charTable.put("otimes", new Character((char) 8855)); 
   charTable.put("perp", new Character((char) 8869)); 
   charTable.put("sdot", new Character((char) 8901)); 
   charTable.put("lceil", new Character((char) 8968)); 
   charTable.put("rceil", new Character((char) 8969)); 
   charTable.put("lfloor", new Character((char) 8970)); 
   charTable.put("rfloor", new Character((char) 8971)); 
   charTable.put("lang", new Character((char) 9001)); 
   charTable.put("rang", new Character((char) 9002)); 
   charTable.put("loz", new Character((char) 9674)); 
   charTable.put("spades", new Character((char) 9824)); 
   charTable.put("clubs", new Character((char) 9827)); 
   charTable.put("hearts", new Character((char) 9829)); 
   charTable.put("diams", new Character((char) 9830)); 
  } 
}
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