一个工具类WebUtil.java（包含设置cookie，得到cookie的方法，去除字符串当中的html标签的方法等等）

package com.itcast.utils;

import java.util.HashMap;
import java.util.Map;
import java.util.regex.Pattern;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Administrator
 *
 */
public class WebUtil {
   
    /***
     * 获取URI的路径,如路径为http://www.babasport.com/action/post.htm?method=add, 得到的值为"/action/post.htm"
     * @param request
     * @return
     */
    public static String getRequestURI(HttpServletRequest request){    
        return request.getRequestURI();
    }
    /**
     * 获取完整请求路径(含内容路径及请求参数)
     * @param request
     * @return
     */
    public static String getRequestURIWithParam(HttpServletRequest request){    
        return getRequestURI(request) + (request.getQueryString() == null ? "" : "?"+ request.getQueryString());
    }
    /**
     * 添加cookie
     * @param response
     * @param name cookie的名称
     * @param value cookie的值
     * @param maxAge cookie存放的时间(以秒为单位,假如存放三天,即3*24*60*60; 如果值为0,cookie将随浏览器关闭而清除)
     */
    public static void addCookie(HttpServletResponse response, String name, String value, int maxAge) {       
        Cookie cookie = new Cookie(name, value);
        cookie.setPath("/");
        if (maxAge>0) cookie.setMaxAge(maxAge);
        response.addCookie(cookie);
    }
   
    /**
     * 获取cookie的值
     * @param request
     * @param name cookie的名称
     * @return
     */
    public static String getCookieByName(HttpServletRequest request, String name) {
     Map<String, Cookie> cookieMap = WebUtil.readCookieMap(request);
        if(cookieMap.containsKey(name)){
            Cookie cookie = (Cookie)cookieMap.get(name);
            return cookie.getValue();
        }else{
            return null;
        }
    }
   
    protected static Map<String, Cookie> readCookieMap(HttpServletRequest request) {
        Map<String, Cookie> cookieMap = new HashMap<String, Cookie>();
        Cookie[] cookies = request.getCookies();
        if (null != cookies) {
            for (int i = 0; i < cookies.length; i++) {
                cookieMap.put(cookies[i].getName(), cookies[i]);
            }
        }
        return cookieMap;
    }
    /**
     * 去除html代码
     * @param inputString
     * @return
     */
    public static String HtmltoText(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_ba;
        java.util.regex.Matcher m_ba;
       
        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 patternStr = "//s+";
           
            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_ba = Pattern.compile(patternStr,Pattern.CASE_INSENSITIVE);
            m_ba = p_ba.matcher(htmlStr);
            htmlStr = m_ba.replaceAll(""); //过滤空格
        
         textStr = htmlStr;
        
        }catch(Exception e) {
                    System.err.println("Html2Text: " + e.getMessage());
        }         
        return textStr;//返回文本字符串
     }
}