java对cookie的操作_01

 /**
          * 读取所有cookie
          * 注意二、从客户端读取Cookie时，包括maxAge在内的其他属性都是不可读的，也不会被提交。浏览器提交Cookie时只会提交name与value属性。maxAge属性只被浏览器用　　　　　　　　　来判断Cookie是否过期
          * @param request
          * @param response
          */
         @RequestMapping("/showCookies")
         public void showCookies(HttpServletRequest request,HttpServletResponse response ){

             Cookie[] cookies = request.getCookies();//这样便可以获取一个cookie数组
             if (null==cookies) {
                 System.out.println("没有cookie=========");
             } else {
                 for(Cookie cookie : cookies){
                     System.out.println("name:"+cookie.getName()+",value:"+ cookie.getValue());
                 }
             }

         }
         /**
          * 添加cookie
          * @param response
          * @param name
          * @param value
          */
         @RequestMapping("/addCookie")
         public void addCookie(HttpServletResponse response,String name,String value){
             Cookie cookie = new Cookie(name.trim(), value.trim());
             cookie.setMaxAge(30 * 60);// 设置为30min
             cookie.setPath("/");
             System.out.println("已添加===============");
             response.addCookie(cookie);
         }
         /**
          * 修改cookie
          * @param request
          * @param response
          * @param name
          * @param value
          * 注意一、修改、删除Cookie时，新建的Cookie除value、maxAge之外的所有属性，例如name、path、domain等，都要与原Cookie完全一样。否则，浏览器将视为两个不　　　　　　　　　　同的Cookie不予覆盖，导致修改、删除失败。
          */
         @RequestMapping("/editCookie")
         public void editCookie(HttpServletRequest request,HttpServletResponse response,String name,String value){
             Cookie[] cookies = request.getCookies();
             if (null==cookies) {
                 System.out.println("没有cookie==============");
             } else {
                 for(Cookie cookie : cookies){
                     if(cookie.getName().equals(name)){
                         System.out.println("原值为:"+cookie.getValue());
                         cookie.setValue(value);
                         cookie.setPath("/");
                         cookie.setMaxAge(30 * 60);// 设置为30min
                         System.out.println("被修改的cookie名字为:"+cookie.getName()+",新值为:"+cookie.getValue());
                         response.addCookie(cookie);
                         break;
                     }
                 }
             }

         }
         /**
          * 删除cookie
          * @param request
          * @param response
          * @param name
          */
         @RequestMapping("/delCookie")
         public void delCookie(HttpServletRequest request,HttpServletResponse response,String name){
             Cookie[] cookies = request.getCookies();
             if (null==cookies) {
                 System.out.println("没有cookie==============");
             } else {
                 for(Cookie cookie : cookies){
                     if(cookie.getName().equals(name)){
                         cookie.setValue(null);
                         cookie.setMaxAge(0);// 立即销毁cookie
                         cookie.setPath("/");
                         System.out.println("被删除的cookie名字为:"+cookie.getName());
                         response.addCookie(cookie);
                         break;
                     }
                 }
             }
         }

 /**
      * 根据名字获取cookie
      * @param request
      * @param name cookie名字
      * @return
      */
     public  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;
         }
     }

     /**
      * 将cookie封装到Map里面
      * @param request
      * @return
      */
     private  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;
     }