java cookie 工具类

 package com.xxx.xxx.xxx.xxx; 

 import java.net.URLDecoder;
 import java.net.URLEncoder;

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

 import org.apache.commons.lang.StringUtils;
 import org.apache.http.cookie.SetCookie;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.web.bind.annotation.ResponseBody;

 /**
 * Cookie 工具类
 *
 * @author
 * @date
 */
 public final class CookieUtils {
 protected static final Logger LOGGER = LoggerFactory
 .getLogger(CookieUtils.class);

 /**
 * 获取cookie的值
 *
 * @author
 * @date
 * @param req
 * @param res
 * @param cookieName
 * @param isDecoder
 * 是：utf-8编码 否：不编码使用默认的
 * @return
 */
 public static String getCookieValue(HttpServletRequest req, String cookieName, Boolean isDecoder) {
 Cookie[] cookieList = req.getCookies();
 if (cookieList == null || cookieName == null) {
 return null;
 }
 String retValueString = null;
 try {
 for (int i = 0; i < cookieList.length; i++) {
 if (cookieList[i].getName().equals(cookieName)) {
 if (isDecoder) {
 retValueString = URLDecoder.decode(
 cookieList[i].getValue(), "utf-8");
 } else {
 retValueString = cookieList[i].getValue();
 }
 }
 }
 } catch (Exception e) {
 LOGGER.error("Cookie Decode Error : ", e);
 }
 return retValueString;

 }

 /**
 * 设置cookie
 *
 * @author
 * @date
 * @param req
 * @param res
 * @param cookieName
 * @param cookieValue
 * @param cookieMaxAge
 * 设置cookie最大生存时间 单位秒
 * @param isDecoder
 * 是：utf-8编码 否：不编码使用默认的
 */
 public static void setCookie(HttpServletRequest req,
 HttpServletResponse res, String cookieName, String cookieValue,
 int cookieMaxAge, Boolean isDecoder) {
 if (cookieValue == null) {
 LOGGER.info(cookieName + " 为 null");
 return;
 }
 try {
 if (isDecoder) {
 cookieValue = URLEncoder.encode(cookieValue, "utf-8");
 }
 Cookie cookie = new Cookie(cookieName, cookieValue);
 if (cookieMaxAge > 0) {
 cookie.setMaxAge(cookieMaxAge);
 }
 if (req != null) {
 cookie.setDomain(getDomainName(req)); //设置cookie域名
 }
 cookie.setPath("/");
 res.addCookie(cookie);
 } catch (Exception e) {
 LOGGER.error("Cookie Decode Error : ", e);
 }

 }
 /**
 * 删除cookie
 * @author
 * @date
 * @param req
 * @param res
 * @param cookieName
 */
 public static void deleteCookie(HttpServletRequest req,HttpServletResponse res,String cookieName){
 setCookie(req, res, cookieName, "", 0, false);
 }

 /**
 * 获取cookie作用域
 * @author gaobing
 * @date 2016年11月23日 上午11:13:37
 * @param req
 * @return
 */
 private static final String getDomainName(HttpServletRequest req) {
 String domainName = "";
 String serverName = req.getRequestURL().toString();

 //String basePath = req.getScheme()+"://"+req.getServerName()+":"+req.getServerPort();
 if (StringUtils.isNotBlank(serverName)) {
 serverName = serverName.toLowerCase().substring(7);
 final int end = serverName.indexOf("/");
 serverName = serverName.substring(0, end);
 final String[] domains = serverName.split("\\.");// \\表示转义
 int len = domains.length;
 if (len > 3) {
 // www.xxx.com.cn
 domainName = "." + domains[len - 3] + "." + domains[len - 2]
 + "." + domains[len - 1];
 } else if (len <= 3 && len > 1) {
 // xxx.com or xxx.cn
 domainName = "." + domains[len - 2] + "." + domains[len - 1];
 } else {
 domainName = serverName;
 }
 }

 if (domainName != "" && domainName.indexOf(":") > 0) {
 String[] ary = domainName.split("\\:");
 domainName = ary[0];
 }
 return domainName;
 }

 }

注意：删除cookie时 浏览器不会立刻删除，重启后会删除。可根据value 值判断cookie是否被删除