java操作cookie

基于SpringMVC框架写的：

/**
         * 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;
                    }
                }
            }
        }

通常开发时先用以下的代码将获取的cookie进行封装：

/**
     * 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;
    }