java.util.regex HTML标签处理

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>
 * 
 */

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
	}
	
	public static void main(String[] args) {
		String strTemp="【摘　要】　</SPAN><SPAN style=\"FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'\">根据高职高专复合材料专业和复合材料学课程的特点，提出通过选用适当的教材，增加前沿内容，舍弃过深的理论和结合社会实践等方面对复合材料学教学内容进行全面改革。实践证明，改革增强了学生的专业意识、学习兴趣，提高了综合实践能力。</SPAN><SPAN lang=EN-US style=\"mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt\"><o:p></o:p></SPAN></P>"+
		"<P class=MsoNormal style=\"mso-layout-grid-align: none\"><SPAN style=\"FONT-FAMILY: 黑体; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt\">";
		
		System.out.println(filterHtml(strTemp));
	}

	/**
	 * 
	 * 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("&lt;");
				break;
			case '>':
				filtered.append("&gt;");
				break;
			case '"':
				filtered.append("&quot;");
				break;
			case '&':
				filtered.append("&amp;");
				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();
	}
}