package util;import java.io.UnsupportedEncodingException;import java.net.URLDecoder;import java.net.URLEncoder;import java.util.HashMap;import java.util.Map;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class CookieUtil {    /**     * 设置cookie     * @param name  cookie名字     * @param value cookie值     * @param maxAge cookie生命周期  以秒为单位     */    public static void addCookie(HttpServletResponse res,String name,String value,String domain,int maxAge){                  try {            value = URLEncoder.encode(""+value, "utf-8");        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        }                Cookie cookie = new Cookie(name, value + "" );        cookie.setPath("/");        cookie.setDomain(domain);        if(maxAge>0)  cookie.setMaxAge(maxAge);        res.addCookie(cookie);    }        /**     * 根据名字获取cookie     * @param name cookie名字     * @return     */    public static Cookie getCookieByName(HttpServletRequest req,String name){        Map
    
      cookieMap = getCookieMap(req);        if(cookieMap.containsKey(name)){            Cookie cookie = (Cookie)cookieMap.get(name);            return cookie;        }else{            return null;        }       }        /**     * 将cookie封装到Map里面     * @return     */    private static Map
     
       getCookieMap(HttpServletRequest req){          Map
      
        cookieMap = new HashMap
       
        ();        Cookie[] cookies = req.getCookies();        if(null!=cookies){            for(Cookie cookie : cookies){                cookieMap.put(cookie.getName(), cookie);            }        }        return cookieMap;    }        public static boolean deleteCookie(HttpServletRequest req,HttpServletResponse res,String cookieName) {           if (cookieName != null) {            Cookie cookie = getCookie(req,cookieName);               if(cookie!=null){                cookie.setMaxAge(0);//0，就立即删除                   cookie.setPath("/");//不要漏掉                   cookie.setDomain(req.getServerName());                res.addCookie(cookie);                   return true;               }        }           return false;       }    public static String getValue(HttpServletRequest req,String cookieName){        Cookie cookie = getCookie(req,cookieName);        return getValue(cookie);    }        public static String getValue(Cookie cookie){        if(null == cookie) return null;        try {            return URLDecoder.decode(cookie.getValue(), "utf-8");        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        }        return null;    }        public static Cookie getCookie(HttpServletRequest req,String cookieName){           Cookie[] cookies = req.getCookies();           Cookie cookie = null;           try {            if (cookies != null && cookies.length > 0) {                   for (int i = 0; i < cookies.length; i++) {                    cookie = cookies[i];                       if (cookie.getName().equals(cookieName)) {                           return cookie;                       }                   }               }           } catch (Exception e) {              e.printStackTrace();           }        return null;       }                                       }