自定义、操作cookie

        /**  
         * 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 = 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")  
        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;  
                    }  
                }  
            }  
        }  
  
    /**  
     * 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;  
    }