Java实现对cookie的增删改查

Posted 2020-09-22 起个名字好难

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

 

1.springMVC框架：

         

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1. /** 
2.          * 读取所有cookie 
3.          * 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 
4.          * @param request 
5.          * @param response 
6.          */  
7.         @RequestMapping("/showCookies")  
8.         public void showCookies(HttpServletRequest request,HttpServletResponse response ){  
9.                
10.             Cookie[] cookies = request.getCookies();//这样便可以获取一个cookie数组  
11.             if (null==cookies) {  
12.                 System.out.println("没有cookie=========");  
13.             } else {  
14.                 for(Cookie cookie : cookies){  
15.                     System.out.println("name:"+cookie.getName()+",value:"+ cookie.getValue());  
16.                 }  
17.             }  
18.                
19.         }  

         

[java] view plain copy

 

1. /** 
2.          * 添加cookie 
3.          * @param response 
4.          * @param name 
5.          * @param value 
6.          */  
7.         @RequestMapping("/addCookie")  
8.         public void addCookie(HttpServletResponse response,String name,String value){  
9.             Cookie cookie = new Cookie(name.trim(), value.trim());  
10.             cookie.setMaxAge(30 * 60);// 设置为30min  
11.             cookie.setPath("/");  
12.             System.out.println("已添加===============");  
13.             response.addCookie(cookie);  
14.         }  

       

[java] view plain copy

 

1. /** 
2.         * 修改cookie 
3.         * @param request 
4.         * @param response 
5.         * @param name 
6.         * @param value 
7.         * 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。 
8.         */  
9.        @RequestMapping("/editCookie")  
10.        public void editCookie(HttpServletRequest request,HttpServletResponse response,String name,String value){  
11.            Cookie[] cookies = request.getCookies();  
12.            if (null==cookies) {  
13.                System.out.println("没有cookie==============");  
14.            } else {  
15.                for(Cookie cookie : cookies){  
16.                    if(cookie.getName().equals(name)){  
17.                        System.out.println("原值为:"+cookie.getValue());  
18.                        cookie.setValue(value);  
19.                        cookie.setPath("/");  
20.                        cookie.setMaxAge(30 * 60);// 设置为30min  
21.                        System.out.println("被修改的cookie名字为:"+cookie.getName()+",新值为:"+cookie.getValue());  
22.                        response.addCookie(cookie);  
23.                        break;  
24.                    }  
25.                }  
26.            }  
27.               
28.        }  

        

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1. /** 
2.          * 删除cookie 
3.          * @param request 
4.          * @param response 
5.          * @param name 
6.          */  
7.         @RequestMapping("/delCookie")  
8.         public void delCookie(HttpServletRequest request,HttpServletResponse response,String name){  
9.             Cookie[] cookies = request.getCookies();  
10.             if (null==cookies) {  
11.                 System.out.println("没有cookie==============");  
12.             } else {  
13.                 for(Cookie cookie : cookies){  
14.                     if(cookie.getName().equals(name)){  
15.                         cookie.setValue(null);  
16.                         cookie.setMaxAge(0);// 立即销毁cookie  
17.                         cookie.setPath("/");  
18.                         System.out.println("被删除的cookie名字为:"+cookie.getName());  
19.                         response.addCookie(cookie);  
20.                         break;  
21.                     }  
22.                 }  
23.             }  
24.         }  

2.一般情况下，会首先对cookie进行封装：

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1. /** 
2.      * 根据名字获取cookie 
3.      * @param request 
4.      * @param name cookie名字 
5.      * @return 
6.      */  
7.     public  Cookie getCookieByName(HttpServletRequest request,String name){  
8.         Map<String,Cookie> cookieMap = ReadCookieMap(request);  
9.         if(cookieMap.containsKey(name)){  
10.             Cookie cookie = (Cookie)cookieMap.get(name);  
11.             return cookie;  
12.         }else{  
13.             return null;  
14.         }    
15.     }  

[java] view plain copy

 

1. /** 
2.     * 将cookie封装到Map里面 
3.     * @param request 
4.     * @return 
5.     */  
6.    private  Map<String,Cookie> ReadCookieMap(HttpServletRequest request){   
7.        Map<String,Cookie> cookieMap = new HashMap<String,Cookie>();  
8.        Cookie[] cookies = request.getCookies();  
9.        if(null!=cookies){  
10.            for(Cookie cookie : cookies){  
11.                cookieMap.put(cookie.getName(), cookie);  
12.            }  
13.        }  
14.        return cookieMap;  
15.    }