jsp/java截取截断html内容的方法与技巧

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http://www.iteye.com/topic/730396
package com.tools;       import java.util.ArrayList;    import java.util.List;    import java.util.regex.Matcher;    import java.util.regex.Pattern;       @SuppressWarnings({"unchecked" })    public class CutHtml {        static String htmlMatch = "";           // 通过递归删除html文件中的配对的html标签           public static String removeMatchHtmlTag() {            // String html="<p></p><table><tr><td></td><td></td></tr></table>";            Pattern p = Pattern.compile("<([a-zA-Z]+)[^<>]*>(.*?)</\\1>");            Matcher m = p.matcher(htmlMatch);            if (m.find()) {            //  System.out.println(htmlMatch);                htmlMatch = htmlMatch.replaceAll("<([a-zA-Z]+)[^<>]*>(.*?)</\\1>","$2");                   removeMatchHtmlTag();            }               return htmlMatch;        }           public static String subStringHTML(String param, int length, String endWith) {               if(length<1) {System.out.println("length must >0");return null;}                        if(param.length()<length){return param;}                        StringBuffer result = new StringBuffer();            StringBuffer str = new StringBuffer();            int n = 0;               char temp;               boolean isCode = false; // 是不是HTML代码            boolean isHTML = false; // 是不是HTML特殊字符,如            for (int i = 0; i < param.length(); i++) {                temp = param.charAt(i);                if (temp == ’<’) {                    isCode = true;                }                else if (temp == ’&’) {                    isHTML = true;                }                else if (temp == ’>’ && isCode) {                    n = n - 1;                    isCode = false;                }                else if (temp == ’;’ && isHTML) {                    isHTML = false;                }                if (!isCode && !isHTML) {                    n = n + 1;                    // UNICODE码字符占两个字节                    if ((temp + "").getBytes().length > 1) {                        n = n + 1;                    }                    str.append(temp);                }                result.append(temp);                if (n >= length) {                    break;                }            }               result.append(endWith);            // 取出截取字符串中的HTML标记            String temp_result = result.toString().replaceAll("(>)[^<>]*(<?)","$1$2");               // 去掉不需要结束标记的HTML标记               temp_result = temp_result                    .replaceAll("<(AREA|BASE|BASEFONT|BODY|BR|COL|COLGROUP|DD|DT|FRAME|HEAD|HR|HTML|IMG|INPUT|ISINDEX|LI|LINK|META|OPTION|P|PARAM|TBODY|TD|TFOOT|TH|THEAD|TR|area|base|basefont|body|br|col|colgroup|dd|dt|frame|head|hr|html|img|input|isindex|li|link|meta|option|p|param|tbody|td|tfoot|th|thead|tr)[^<>]*/>","");               // 去掉成对的HTML标记            // temp_result=temp_result.replaceAll("<([a-zA-Z]+)[^<>]*>(.*?)</\\1>","$2");            htmlMatch = temp_result;            temp_result = removeMatchHtmlTag();            //System.out.println("6666:" + temp_result);            // 用正则表达式取出标记               Pattern p = Pattern.compile("<([a-zA-Z]+)[^<>]*>");            Matcher m = p.matcher(temp_result);            List endHTML = new ArrayList();               while (m.find()) {                endHTML.add(m.group(1));            }               // 补全不成对的HTML标记            for (int i = endHTML.size() - 1; i >= 0; i--) {                result.append("</");                result.append(endHTML.get(i));                result.append(">");               }            return result.toString();           }           public static void main(String args[]) {            String param = "<html><p><p>0<img src=’xx.gif’/>http://www.dukai168.cn ©</p><table><tr><td>678901</td><td>21111111111</td></tr></table></p></html>";            System.out.println(CutHtml.subStringHTML(param,100, "..."));        }       }