Java tutorial
/******************************************************************************* * Copyright (c) 2004 Actuate Corporation. All rights reserved. This program and * the accompanying materials are made available under the terms of the Eclipse * Public License v1.0 which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html Contributors: Actuate Corporation - * initial API and implementation ******************************************************************************/ import java.util.HashMap; /** * Description: Utility for converting character references e.g.: < > * " å И 水 * */ public class HTMLDecoder { private static final HashMap 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(); 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("Yuml", new Character((char) 376)); 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)); } }