我是把保存读取写在工具类里面，优化cookie的时候就在工具类优化就好了，其实原理就那几行，主要就是在response写入cookie,resp.addCookie(new Cookie(key,value));这个代码那里都可以写，只要你拿的到response就可以了。
public class CookieUtil { /** * 保存Cookies * @param response * @param key * @param value * @param time * @param ip * @return */ public static HttpServletResponse setCookie(HttpServletResponse response, String key, String value, int time,String ip) { // new一个Cookie对象,键值对为参数 Cookie cookie = new Cookie(key, value); // tomcat下多应用共享 cookie.setPath("/"); //cookie.setDomain(ip); // 如果cookie的值中含有中文时，需要对cookie进行编码，不然会产生乱码. try { URLEncoder.encode(value, "utf-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } //秒为单位 cookie.setMaxAge(time); // 将Cookie添加到Response中,使之生效 response.addCookie(cookie); // addCookie后，如果已经存在相同名字的cookie，则最新的覆盖旧的cookie return response; } /** * 将cookie封装到Map里面 * @param request * @return */ private static Map<String, Cookie> ReadCookieMap(HttpServletRequest request) { Map<String, Cookie> cookieMap = new HashMap<String, Cookie>(); Cookie[] cookies = request.getCookies(); if (null != cookies) { for (Cookie cookie : cookies) { cookieMap.put(cookie.getName(), cookie); } } return cookieMap; } /** * 根据名字获取cookie * * @param request * @param name * cookie名字 * @return */ public static Cookie getCookieByName(HttpServletRequest request, String name) { Map<String, Cookie> cookieMap = ReadCookieMap(request); if (cookieMap.containsKey(name)) { Cookie cookie = (Cookie) cookieMap.get(name); return cookie; } else { return null; } } /** * 删除无效cookie * @param request * @param response * @param deleteKey * @throws NullPointerException */ private void delectCookieByName(HttpServletRequest request, HttpServletResponse response,String deleteKey) throws NullPointerException { Map<String, Cookie> cookieMap = ReadCookieMap(request); for (String key : cookieMap.keySet()) { if (key == deleteKey && key.equals(deleteKey)) { Cookie cookie = cookieMap.get(key); cookie.setMaxAge(0);//设置cookie有效时间为0 cookie.setPath("/");//不设置存储路径 response.addCookie(cookie); } } } }写入方式：（调用工具类接口传参就完事了）
//将userId,tiken存入cookie CookieUtil.setCookie(response,"userId",userSession.getUser().getId().toString(),1800,userSession.getIp());读取cookie有3种方式，反正我现在只知道3种:
//1.获取的是数组类型的cookie Cookie[] cookies=request.getCookies(); //循环或者这么取都行 String cookie = request.getCookies()[0].getValue(); //2.使用自己封装好的的工具类 CookieUtil.getCookieByName(request,"userId");3.如果你是spring boot，在需要使用cookie的方法下面使用注解@CookieValue，userId自动获取，name要对的上哦，完事！
@RequestMapping(value = "/isStore",method = RequestMethod.GET) public ResponseEntity<ErrorMessageBag> isStore(@CookieValue(value = "userId")String userId){