balises HTML de filtre d'expression régulière Java

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * <p>
 * Title: HTML相关的正则表达式工具类
 * </p>
 * <p>
 * Description: 包括过滤HTML标记，转换HTML标记，替换特定HTML标记
 * </p>
 * <p>
 * Copyright: Copyright (c) 2006
 * </p>
 *
 * @author hejian
 * @version 1.0
 * @createtime 2006-10-16
 */
  public class HtmlRegexpUtil {   private final static String regxpForHtml = "<([^>]*)>"; // 过滤所有以<开头以>结尾的标签
  private final static String regxpForImgTag = "<\\s*img\\s+([^>]*)\\s*>"; // 找出IMG标签
  private final static String regxpForImaTagSrcAttrib = "src=\"([^\"]+)\""; // 找出IMG标签的SRC属性
  /**
     *
     */  public HtmlRegexpUtil() {   // TODO Auto-generated constructor stub       }
  /**
     *
     * 基本功能：替换标记以正常显示
     * <p>
     *
     * @param input
     * @return String
     */  public String replaceTag(String input) {   if (!hasSpecialChars(input)) {   return input;
        }
        StringBuffer filtered = new StringBuffer(input.length());   char c;   for (int i = 0; i <= input.length() - 1; i++) {
            c = input.charAt(i);   switch (c) {   case '<':
                filtered.append("<");   break;   case '>':
                filtered.append(">");   break;   case '"':
                filtered.append(""");   break;   case '&':
                filtered.append("&");   break;   default:
                filtered.append(c);
            }

        }   return (filtered.toString());
    }
  /**
     *
     * 基本功能：判断标记是否存在
     * <p>
     *
     * @param input
     * @return boolean
     */  public boolean hasSpecialChars(String input) {   boolean flag = false;   if ((input != null) && (input.length() > 0)) {   char c;   for (int i = 0; i <= input.length() - 1; i++) {
                c = input.charAt(i);   switch (c) {   case '>':
                    flag = true;   break;   case '<':
                    flag = true;   break;   case '"':
                    flag = true;   break;   case '&':
                    flag = true;   break;
                }
            }
        }   return flag;
    }
  /**
     *
     * 基本功能：过滤所有以"<"开头以">"结尾的标签
     * <p>
     *
     * @param str
     * @return String
     */  public static String filterHtml(String str) {
        Pattern pattern = Pattern.compile(regxpForHtml);
        Matcher matcher = pattern.matcher(str);
        StringBuffer sb = new StringBuffer();   boolean result1 = matcher.find();   while (result1) {
            matcher.appendReplacement(sb, "");
            result1 = matcher.find();
        }
        matcher.appendTail(sb);   return sb.toString();
    }
  /**
     *
     * 基本功能：过滤指定标签
     * <p>
     *
     * @param str
     * @param tag
     *            指定标签
     * @return String
     */  public static String fiterHtmlTag(String str, String tag) {
        String regxp = "<\\s*" + tag + "\\s+([^>]*)\\s*>";
        Pattern pattern = Pattern.compile(regxp);
        Matcher matcher = pattern.matcher(str);
        StringBuffer sb = new StringBuffer();   boolean result1 = matcher.find();   while (result1) {
            matcher.appendReplacement(sb, "");
            result1 = matcher.find();
        }
        matcher.appendTail(sb);   return sb.toString();
    }
  /**
     *
     * 基本功能：替换指定的标签
     * <p>
     *
     * @param str
     * @param beforeTag
     *            要替换的标签
     * @param tagAttrib
     *            要替换的标签属性值
     * @param startTag
     *            新标签开始标记
     * @param endTag
     *            新标签结束标记
     * @return String
     * @如：替换img标签的src属性值为[img]属性值[/img]
     */  public static String replaceHtmlTag(String str, String beforeTag,
            String tagAttrib, String startTag, String endTag) {
        String regxpForTag = "<\\s*" + beforeTag + "\\s+([^>]*)\\s*>";
        String regxpForTagAttrib = tagAttrib + "=\"([^\"]+)\"";
        Pattern patternForTag = Pattern.compile(regxpForTag);
        Pattern patternForAttrib = Pattern.compile(regxpForTagAttrib);
        Matcher matcherForTag = patternForTag.matcher(str);
        StringBuffer sb = new StringBuffer();   boolean result = matcherForTag.find();   while (result) {
            StringBuffer sbreplace = new StringBuffer();
            Matcher matcherForAttrib = patternForAttrib.matcher(matcherForTag
                    .group(1));   if (matcherForAttrib.find()) {
                matcherForAttrib.appendReplacement(sbreplace, startTag   + matcherForAttrib.group(1) + endTag);
            }
            matcherForTag.appendReplacement(sb, sbreplace.toString());
            result = matcherForTag.find();
        }
        matcherForTag.appendTail(sb);   return sb.toString();
    }
}

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