HTMLUtil

package net.oschina.app.util;

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

public class HTMLUtil {
	private static final String regEx_script = "<script[^>]*?>[\\s\\S]*?<\\/script>"; // 定义script的正则表达式
	private static final String regEx_style = "<style[^>]*?>[\\s\\S]*?<\\/style>"; // 定义style的正则表达式
	private static final String regEx_html = "<[^>]+>"; // 定义HTML标签的正则表达式
	private final static String regxpForHtml = "<([^>]*)>"; // 过滤所有以<开头以>结尾的标签

	public static String delHTMLTag(String htmlStr) {
		Pattern p_script = Pattern.compile(regEx_script,
				Pattern.CASE_INSENSITIVE);
		Matcher m_script = p_script.matcher(htmlStr);
		htmlStr = m_script.replaceAll(""); // 过滤script标签

		Pattern p_style = Pattern
				.compile(regEx_style, Pattern.CASE_INSENSITIVE);
		Matcher m_style = p_style.matcher(htmlStr);
		htmlStr = m_style.replaceAll(""); // 过滤style标签

		Pattern p_html = Pattern.compile(regEx_html, Pattern.CASE_INSENSITIVE);
		Matcher m_html = p_html.matcher(htmlStr);
		htmlStr = m_html.replaceAll(""); // 过滤html标签

		return htmlStr.trim(); // 返回文本字符串
	}
	
	/**
	 * 基本功能：替换标记以正常显示
	 * @param input
	 * @return String
	 */
	public static 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
	 * @param input
	 * @return boolean
	 */
	public static 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
	 * @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
	 * @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
	 * @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();
	}
}