java操作cookie，javacookie

java操作cookie，javacookie

基於SpringMVC框架寫的：

/**
         * 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。浏覽器提交Cookie時只會提交name與value屬性。
         * maxAge屬性只被浏覽器用來判斷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，浏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;
                    }
                }
            }
        }

通常開發時先用以下的代碼將獲取的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裡面
     * @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;
    }