Java实现对cookie的操作(增删改查)

/** 
         * 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; 
                    } 
                } 
            } 
        }

2、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; 
    }