Java實現對cookie的增刪改查

原文：http://blog.csdn.net/k21325/article/details/54377830

 

1.springMVC框架：

         

/**
         * 讀取所有cookie
         * 注意二、從客戶端讀取Cookie時，包括maxAge在內的其他屬性都是不可讀的，也不會被提交。瀏覽器提交Cookie時只會提交name與value屬性。maxAge屬性只被瀏覽器用來判斷Cookie是否過期
         * @param request
         * @param response
         */
        @RequestMapping("/showCookies")
        public void showCookies(HttpServletRequest request,HttpServletResponse response ){

            Cookie[] cookies = request.getCookies();//這樣便可以獲取一個cookie數組
            if (null==cookies) {
                System.out.println("沒有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);// 設置為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、刪除Cookie時，新建的Cookie除value、maxAge之外的所有屬性，例如name、path、domain等，都要與原Cookie完全一樣。否則，瀏覽器將視為兩個不同的Cookie不予覆蓋，導致修改、刪除失敗。
        */
       @RequestMapping("/editCookie")
       public void editCookie(HttpServletRequest request,HttpServletResponse response,String name,String value){
           Cookie[] cookies = request.getCookies();
           if (null==cookies) {
               System.out.println("沒有cookie==============");
           } else {
               for(Cookie cookie : cookies){
                   if(cookie.getName().equals(name)){
                       System.out.println("原值為:"+cookie.getValue());
                       cookie.setValue(value);
                       cookie.setPath("/");
                       cookie.setMaxAge(30 * 60);// 設置為30min
                       System.out.println("被修改的cookie名字為:"+cookie.getName()+",新值為:"+cookie.getValue());
                       response.addCookie(cookie);
                       break;
                   }
               }
           }

       }

        

/**
         * 刪除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("沒有cookie==============");
            } else {
                for(Cookie cookie : cookies){
                    if(cookie.getName().equals(name)){
                        cookie.setValue(null);
                        cookie.setMaxAge(0);// 立即銷毀cookie
                        cookie.setPath("/");
                        System.out.println("被刪除的cookie名字為:"+cookie.getName());
                        response.addCookie(cookie);
                        break;
                    }
                }
            }
        }

2.一般情況下，會首先對cookie進行封裝：

/**
     * 根據名字獲取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;
        }
    }

/**
    * 將cookie封裝到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;
   }