cookie工具类

最新推荐文章于 2019-08-15 17:00:51 发布

转载最新推荐文章于 2019-08-15 17:00:51 发布 · 41 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/zfy0098/p/5098999.html

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#java

本文详细介绍了如何使用Java处理HTTP Cookie，包括设置、删除以及获取Cookie值的方法。

  2 
  3 import javax.servlet.http.Cookie;
  4 import javax.servlet.http.HttpServletRequest;
  5 import javax.servlet.http.HttpServletResponse;
  6 
  7 
  8 public class CookieHelper {
  9     
 10     
 11     /**
 12      * 设置cookie有效期，根据需要自定义[本系统设置为30天]
 13      */
 14     private final static int COOKIE_MAX_AGE = 60 * 60 * 24 * 30;
 15 
 16     /**
 17      * 
 18      * @desc 删除指定Cookie
 19      * @param response
 20      * @param cookieName
 21      *            cookie的名称
 22      */
 23     public static void removeCookie( HttpServletRequest request, HttpServletResponse response,
 24             String cookieName) {
 25 
 26         Cookie[] cookies = request.getCookies();
 27         for (int i = 0; i < cookies.length; i++) {
 28             Cookie cookie = new Cookie(cookieName, null);
 29             cookie.setMaxAge(0);
 30             response.addCookie(cookie);
 31         }
 32     }
 33 
 34     /**
 35      * 
 36      * @desc 删除指定Cookie
 37      * @param response
 38      * @param cookie
 39      * @param domain
 40      */
 41     public static void removeCookie(HttpServletRequest request , HttpServletResponse response,
 42             String cookieName, String domain) {
 43         Cookie[] cookies = request.getCookies();
 44         for (int i = 0; i < cookies.length; i++) {
 45             Cookie cookie = new Cookie(cookieName, null);
 46             cookie.setMaxAge(0);
 47             cookie.setDomain(domain);
 48             response.addCookie(cookie);
 49         }
 50     }
 51 
 52     /**
 53      * 
 54      * @desc 根据Cookie名称得到Cookie的值，没有返回Null
 55      * @param name
 56      *            Cookie名称
 57      * @return
 58      */
 59     public static String getCookieValue(HttpServletRequest request ,String name) {
 60 
 61         Cookie cookie = getCookie(request , name);
 62         if (cookie != null) {
 63             return cookie.getValue();
 64         } else {
 65             return null;
 66         }
 67     }
 68 
 69     /**
 70      * 
 71      * @desc 根据Cookie名称得到Cookie对象，不存在该对象则返回Null
 72      * @param request
 73      * @param name
 74      */
 75     public static Cookie getCookie(HttpServletRequest request , String name) {
 76 
 77         Cookie cookies[] = request.getCookies();
 78         if (cookies == null || name == null || name.length() == 0) {
 79             return null;
 80         }
 81         Cookie cookie = null;
 82         for (int i = 0; i < cookies.length; i++) {
 83             if (!cookies[i].getName().equals(name)) {
 84                 continue;
 85             }
 86             cookie = cookies[i];
 87             if (request.getServerName().equals(cookie.getDomain())) {
 88                 break;
 89             }
 90         }
 91         return cookie;
 92     }
 93 
 94     /**
 95      * 
 96      * @desc 添加一条新的Cookie信息，默认有效时间为一个月
 97      * @param response
 98      * @param name
 99      * @param value
100      */
101     public static void setCookie(HttpServletResponse response, String name,
102             String value) {
103         setCookie(response, name, value, COOKIE_MAX_AGE);
104     }
105 
106     /**
107      * 
108      * @desc 添加一条新的Cookie信息，可以设置其最长有效时间(单位：秒)
109      * @param response
110      * @param name
111      * @param value
112      * @param maxAge
113      */
114     public static void setCookie(HttpServletResponse response, String name,
115             String value, int maxAge) {
116         if (value == null) {
117             value = "";
118         }
119         Cookie cookie = new Cookie(name, value);
120         if (maxAge > 0) {
121             cookie.setMaxAge(maxAge);
122         } else {
123             cookie.setMaxAge(COOKIE_MAX_AGE);
124         }
125         response.addCookie(cookie);
126     }
127 
128 }