提供一个JAVA过滤HTML代码和截取字符串的类（包括测试用例）

import java.util.regex.Pattern;  
  
public class FunctionUtil {  
    public static void main(String[] args) {  
        String str = "<p><font size=\"2\"><span style=\" mce_style=\"font-size: 10.5pt\">"  
                + "依据绩abc效管理体系的规定，公司决定于</span><span style=\" mce_style=\"font-size: 10.5pt\">"  
                + "2008</span><span style=\" mce_style=\"font-size: 10.5pt\">年</span><span style=\" "  
                + "mce_style=\"font-size: 10.5pt\">12</span><span style=\" mce_style=\"font-size: 10.5pt\">"  
                + "月</span><span style=\" mce_style=\"font-size: 10.5pt\">22</span><span style=\" "  
                + "mce_style=\"font-size: 10.5pt\">日</span><span style=\" mce_style=\"font-size: 10.5pt\">"  
                + "\"-2009</span><span style=\" mce_style=\"font-size: 10.5pt\">年</span><span style=\" "  
                + "mce_style=\"font-size: 10.5pt\">1</span><span style=\" mce_style=\"font-size: 10.5pt\">"  
                + "月</span><span style=\" mce_style=\"font-size: 10.5pt\"> 23& </span><span style=\" "  
                + "mce_style=\"font-size: 10.5pt\">日期间进行</span><span style=\" mce_style=\"font-size: "  
                + "10.5pt\">2008</span><span style=\" mce_style=\"font-size: 10.5pt\">年年度绩效考评工作，"  
                + "具体事项如下：</span></font></p>";  
        String str_text = Html2Text(str);  
        System.out.println(str_text);  
        String slice = abbreviate(str_text, 100, "...");  
        System.out.println(slice);  
    }  
  
    /** 
     * @param str : 
     *            source string 
     * @param width : 
     *            string's byte width 
     * @param ellipsis : 
     *            a string added to abbreviate string bottom 
     * @return String Object 
     *  
     */  
    public static String abbreviate(String str, int width, String ellipsis) {  
        if (str == null || "".equals(str)) {  
            return "";  
        }  
  
        int d = 0; // byte length  
        int n = 0; // char length  
        for (; n < str.length(); n++) {  
            d = (int) str.charAt(n) > 256 ? d + 2 : d + 1;  
            if (d > width) {  
                break;  
            }  
        }  
  
        if (d > width) {  
            n = n - ellipsis.length() / 2;  
            return str.substring(0, n > 0 ? n : 0) + ellipsis;  
        }  
  
        return str = str.substring(0, n);  
    }  
  
    /** 
     * @param str : 
     *            source string 
     * @param width : 
     *            string's byte width 
     * @param ellipsis : 
     *            a string added to abbreviate string bottom 
     * @return String Object 
     *  
     */  
    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;  
  
        java.util.regex.Pattern p_html1;  
        java.util.regex.Matcher m_html1;  
  
        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  
            String regEx_html1 = "<[^>]+";  
            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  
  
            p_html1 = Pattern.compile(regEx_html1, Pattern.CASE_INSENSITIVE);  
            m_html1 = p_html1.matcher(htmlStr);  
            htmlStr = m_html1.replaceAll(""); // 过滤html标签  
  
            textStr = htmlStr;  
  
        } catch (Exception e) {  
            System.err.println("Html2Text: " + e.getMessage());  
        }  
  
        return textStr;// 返回文本字符串  
    }  
}