HtmlRegexpUtil.java

package com.luckin.stock.utils;

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("&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 pattern1 = Pattern.compile(regxpForHtml);   
        Matcher matcher1 = pattern1.matcher(str);   
        StringBuffer sb1 = new StringBuffer();   
        boolean result1 = matcher1.find();   
        while (result1) {   
            matcher1.appendReplacement(sb1, "");   
            result1 = matcher1.find();   
        }   
        matcher1.appendTail(sb1);   
      
        Pattern pattern2 = Pattern.compile(regxpForImgTag);   
        Matcher matcher2 = pattern2.matcher(sb1.toString());   
        StringBuffer sb2 = new StringBuffer();   
        boolean result2 = matcher2.find();   
        while (result2) {   
            matcher2.appendReplacement(sb2, "");   
            result2 = matcher2.find();   
        }   
        matcher2.appendTail(sb2);   
        
        Pattern pattern3 = Pattern.compile(regxpForImaTagSrcAttrib);   
        Matcher matcher3 = pattern3.matcher(sb2.toString());   
        StringBuffer sb3 = new StringBuffer();   
        boolean result3 = matcher3.find();   
        while (result3) {   
            matcher3.appendReplacement(sb2, "");   
            result3 = matcher3.find();   
        }   
        matcher3.appendTail(sb3);   
        
        return sb3.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();   
    }   
    
    public static void main(String[] args) {
    	 
        String test="<b>hi</b></br><h1>hello~</h1><哈哈><img src='asfsaf'>";
 
        String b=Html2Text(test);
 
        System.out.println(b);
    }
 
    public static String Html2Text(String inputString) {
        String htmlStr = inputString; // 含html标签的字符串
        String textStr = "";
        java.util.regex.Pattern p_script;
        java.util.regex.Matcher m_script;
        java.util.regex.Pattern p_style;
        java.util.regex.Matcher m_style;
        java.util.regex.Pattern p_html;
        java.util.regex.Matcher m_html;
 
        try {
            String regEx_script = "<[\\s]*?script[^>]*?>[\\s\\S]*?<[\\s]*?\\/[\\s]*?script[\\s]*?>"; // 定义script的正则表达式{或<script[^>]*?>[\\s\\S]*?<\\/script>
                                                                                                        // }
            String regEx_style = "<[\\s]*?style[^>]*?>[\\s\\S]*?<[\\s]*?\\/[\\s]*?style[\\s]*?>"; // 定义style的正则表达式{或<style[^>]*?>[\\s\\S]*?<\\/style>
                                                                                                    // }
            String regEx_html = "<[^>]+>"; // 定义HTML标签的正则表达式
 
            p_script = Pattern.compile(regEx_script, Pattern.CASE_INSENSITIVE);
            m_script = p_script.matcher(htmlStr);
            htmlStr = m_script.replaceAll(""); // 过滤script标签
 
            p_style = Pattern.compile(regEx_style, Pattern.CASE_INSENSITIVE);
            m_style = p_style.matcher(htmlStr);
            htmlStr = m_style.replaceAll(""); // 过滤style标签
 
            p_html = Pattern.compile(regEx_html, Pattern.CASE_INSENSITIVE);
            m_html = p_html.matcher(htmlStr);
            htmlStr = m_html.replaceAll(""); // 过滤html标签
 
            textStr = htmlStr;
 
        } catch (Exception e) {
            System.err.println("Html2Text: " + e.getMessage());
        }
 
        textStr = filterHtml(textStr);
        fiterHtmlTag(textStr,"iframe");
        fiterHtmlTag(textStr,"html");
        
        return textStr;// 返回文本字符串
    }
}