Java实现对cookie的增删改查

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

1.springMVC框架：

/** 
         * 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;  
                    }  
                }  
            }  
        }  

2.一般情况下，会首先对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;  
   }