HTML Encode : Document HTML « Development Class « Java





HTML Encode

   
/*
 * HTMLEncode.java
 *
 * Created on 2007-9-15, 21:24:34
 *
Copyright (C) 2006,2007  Yong Li. All rights reserved.
 
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
 
This library 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
Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

//package com.teesoft.util;

/**
 *
 * @author wind
 */

import java.util.Hashtable;

public class HTMLEncode {

  private HTMLEncode() {
  }

  protected static synchronized void buildEntityTables() {
    entityTableEncode = new Hashtable(ENTITIES.length);
    for (int i = 0; i < ENTITIES.length; i += 2) {
      if (!entityTableEncode.containsKey(ENTITIES[i])) {
        entityTableEncode.put(ENTITIES[i], ENTITIES[i + 1]);
      }
    }
  }

  public static final String encode(String s) {
    return encode(s, "\n<br>");
  }

  public static final String encode(String s, String cr) {
    if (entityTableEncode == null) {
      buildEntityTables();
    }
    if (s == null) {
      return "";
    }
    StringBuffer sb = new StringBuffer(s.length() * 2);
    for (int i = 0; i < s.length(); i++) {
      char ch = s.charAt(i);
      if (ch >= '?' && ch <= 'Z' || ch >= 'a' && ch <= 'z' || ch == ' ') {
        sb.append(ch);
        continue;
      }
      if (ch == '\n') {
        sb.append(cr);
        continue;
      }
      String chEnc = encodeSingleChar(String.valueOf(ch));
      if (chEnc != null) {
        sb.append(chEnc);
      } else {
        sb.append("&#");
        sb.append((new Integer(ch)).toString());
        sb.append(';');
      }
    }

    return sb.toString();
  }

  public static final String escape(String s) {
    if (entityTableEncode == null) {
      buildEntityTables();
    }
    if (s == null) {
      return "";
    }
    StringBuffer sb = new StringBuffer(s.length() * 2);
    for (int i = 0; i < s.length(); i++) {
      char ch = s.charAt(i);
      if (ch >= '?' && ch <= 'Z' || ch >= 'a' && ch <= 'z' || ch == ' ') {
        sb.append(ch);
        continue;
      }
      String chEnc = encodeSingleChar(String.valueOf(ch));
      if (chEnc != null) {
        sb.append(chEnc);
      } else {
        sb.append(ch);
      }
    }

    return sb.toString();
  }

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

  private static final String[] ENTITIES = { ">", "&gt;", "<", "&lt;", "[",
      "&#91;<b>", "]", "</b>&#93;", "&", "&amp;", "\"", "&quot;", "'",
      "&#039;", "\\", "&#092;", "\251", "&copy;", "\256", "&reg;" };
  private static Hashtable entityTableEncode = null;

}

   
    
    
  










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