操作 Cookie 的Java工具类

1. /**
2. * cn.itcast.bbs.util.CookieUtil
3. * 2014-5-26
4. * Cookie操作工具类
5. * gyy
6. */ 
7. package cn.itcast.bbs.util; 
8.  
9. import javax.servlet.http.Cookie; 
10. import javax.servlet.http.HttpServletRequest; 
11. import javax.servlet.http.HttpServletResponse;
12.  
13. public class CookieUtil { 
14.  
15.     private staticfinal int COOKIE_MAX_AGE =7 * 24 *3600; 
16.  
17.     public staticvoid removeCookie(HttpServletRequest request,
18.             HttpServletResponse response, String name) { 
19.         if (null == name) { 
20.             return; 
21.         } 
22.         Cookie cookie = getCookie(request, name); 
23.         if(null != cookie){ 
24.             cookie.setPath("/"); 
25.             cookie.setValue(""); 
26.             cookie.setMaxAge(0); 
27.             response.addCookie(cookie); 
28.         } 
29.     } 
30.  
31.     /**
32.      * 根据Cookie名称得到Cookie对象，不存在该对象则返回Null
33.      *
34.      * @param request
35.      * @param name
36.      * @return
37.      */ 
38.     public static Cookie getCookie(HttpServletRequest request, String name) { 
39.         Cookie[] cookies = request.getCookies(); 
40.         if (null == cookies ||null == name || name.length() == 0) { 
41.             return null; 
42.         } 
43.         Cookie cookie = null; 
44.         for (Cookie c : cookies) { 
45.             if (name.equals(c.getName())) { 
46.                 cookie = c; 
47.                 break; 
48.             } 
49.         } 
50.         return cookie; 
51.     } 
52.  
53.     /**
54.      * 添加一条新的Cookie，默认7天过期时间(单位：秒)
55.      *
56.      * @param response
57.      * @param name
58.      * @param value
59.      */ 
60.     public staticvoid setCookie(HttpServletResponse response, String name, 
61.             String value) { 
62.         setCookie(response, name, value, COOKIE_MAX_AGE); 
63.     } 
64.  
65.     /**
66.      * 添加一条新的Cookie，可以指定过期时间(单位：秒)
67.      *
68.      * @param response
69.      * @param name
70.      * @param value
71.      * @param maxValue
72.      */ 
73.     public staticvoid setCookie(HttpServletResponse response, String name, 
74.             String value, int maxValue) { 
75.         if (null == name) { 
76.             return; 
77.         } 
78.         if (null == value) { 
79.             value = ""; 
80.         } 
81.         Cookie cookie = new Cookie(name, value); 
82.         cookie.setPath("/"); 
83.         if (maxValue != 0) { 
84.             cookie.setMaxAge(maxValue); 
85.         } else { 
86.             cookie.setMaxAge(COOKIE_MAX_AGE); 
87.         } 
88.         response.addCookie(cookie); 
89.     } 
90. }