HTML工具类

 

package ssh.util;

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

/**
 * HTML工具
 * @author gary
 *
 */
public class HTMLUtil {

	//>
	public static final String GT = ">";
	//<
	public static final String LT = "&lt;";
	//"
	public static final String QUOT = "&quot;";
	//&
	public static final String AMP = "&amp;";
	//空格
	public static final String SPACE = "&nbsp;";
	//©
	public static final String COPYRIGHT = "&copy;";
	//®
	public static final String REG = "&reg;";
	//™
	public static final String TM = "&trade;";
	//¥
	public static final String RMB = "&yen;";
	
	
	/**
	 * 删除script标签
	 * @param str
	 * @return
	 */
	public static String delScriptTag(String str){
		String regEx_script = "<script[^>]*?>[\\s\\S]*?<\\/script>";
		Pattern p_script = Pattern.compile(regEx_script,Pattern.CASE_INSENSITIVE);
		Matcher m_script = p_script.matcher(str); 
        str = m_script.replaceAll("");
        return str.trim();
	}

	/**
	 * 删除style标签
	 * @param str
	 * @return
	 */
	public static String delStyleTag(String str){
		String regEx_style="<style[^>]*?>[\\s\\S]*?<\\/style>";
        Pattern p_style = Pattern.compile(regEx_style,Pattern.CASE_INSENSITIVE); 
        Matcher m_style = p_style.matcher(str); 
        str = m_style.replaceAll("");
        return str;
	}
	
	/**
	 * 删除HTML标签
	 * @param str
	 * @return
	 */
	public static String delHTMLTag(String str){
		String regEx_html = "<[^>]+>"; 
        Pattern p_html = Pattern.compile(regEx_html,Pattern.CASE_INSENSITIVE); 
        Matcher m_html = p_html.matcher(str); 
        str = m_html.replaceAll("");
        return str;
	}
	
	/**
	 * 删除所有标签
	 * @param str
	 * @return
	 */
	public static String delAllTag(String str){ 
        //删script
        str = delScriptTag(str);
        //删style
        str = delStyleTag(str);
        //删HTML
        str = delHTMLTag(str);
        return str;
    }
	
	/**
	 * 清除标签,恢复HTML转义字符
	 * @param str
	 * @return
	 */
	public static String clean(String str){
		str = delAllTag(str);
		str = str.replaceAll(SPACE, " ");
		str = str.replaceAll(GT, ">");
		str = str.replaceAll(LT, "<");
		str = str.replaceAll(QUOT, "\"");
		str = str.replaceAll(AMP, "&");
		str = str.replaceAll(COPYRIGHT, "©");
		str = str.replaceAll(REG,"®");
		str = str.replaceAll(TM,"™");
		str = str.replaceAll(RMB,"¥");
		return str;
	}
	
	/**
	 * 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();
	}

	/**
	 * 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
	 * example:	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();
	}

	public static void main(String[] args) {
		System.out.println(clean(URLUtil.url2Str("http://www.baidu.com")));
	}
	
}