public class SubStringHTML

public String subStringHTML(String param,int length,String end) {

StringBuffer result = 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;

result.append(temp);

if (n >= length) {

break;

result.append(end);

//取出截取字符串中的HTML标记

String temp_result = result.toString().replaceAll("(>)[^<>]*()", "$1$2");

//去掉不需要结素标记的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("]*>(.*?)\\1>","$2");

//用正则表达式取出标记

Pattern p = Pattern.compile("]*>");

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();