Java实现对cookie的操作(增删改查)

Bertha 。 2022-09-26 12:57 241阅读 0赞

/**
             * 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")
            publicvoid 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")
            publicvoid addCookie(HttpServletResponse response,String name,String value){
                Cookie cookie = newCookie(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")
            publicvoid 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")
            publicvoid 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);
                returncookie;
            }else{
                returnnull;
            }  
        }
          
    通常开发时先用以下的代码将获取的cookie进行封装
          
          
        /**
         * 将cookie封装到Map里面
         * @param request
         * @return
         */
        private Map<String,Cookie> ReadCookieMap(HttpServletRequest request){  
            Map<String,Cookie> cookieMap = newHashMap<String,Cookie>();
            Cookie[] cookies = request.getCookies();
            if(null!=cookies){
                for(Cookie cookie : cookies){
                    cookieMap.put(cookie.getName(), cookie);
                }
            }
            returncookieMap;
        }