原文地址:http://www.cnblogs.com/greatverve/archive/2011/07/05/asp-net-cookie-domain.html
将Cookie的有效范围限制到域。 默认情况下,Cookie 与特定的域相关联。 例如,如果您的站点是 www.contoso.com,那么当用户向该站点请求页面时, 您编写的Cookie就被发送到服务器。(有特定路径值的Cookie除外) 如果您的站点有子域(例如 contoso.com、sales.contoso.com 和 support.contoso.com), 就可以把Cookie同特定的子域相关联。为此,需要设置Cookie的 Domain 属性,如下所示:
Response.Cookies( "domain ").Value = DateTime.Now.ToString Response.Cookies( "domain ").Expires = DateTime.Now.AddDays(1) Response.Cookies( "domain ").Domain = "support.contoso.com "
如果按照这种方式设置域,则Cookie只能用于指定子域中的页面。 您也可以利用Domain属性来创建可在多个子域中共享的Cookie。例如,对域进行如下设置:
Response.Cookies( "domain ").Value = DateTime.Now.ToString Response.Cookies( "domain ").Expires = DateTime.Now.AddDays(1) Response.Cookies( "domain ").Domain = "contoso.com "
这样,该 Cookie 就可用于主域、sales.contoso.com 和 support.contoso.com。
以下是创建一个跨域的Cookie,只能实现同一个根域下的Cookie 如:www.it100.info,在这个根域下的所有二级域名可共享Cookie,{mail.it100.info,photo.it100.info}
public static bool CreateCookie(string strCookieName, string strCookieValue, string strDomain, bool blURLEncode) { if (blURLEncode) { strCookieValue = System.Web.HttpContext.Current.Server.UrlEncode(strCookieValue); } HttpCookie objCookie = new HttpCookie(strCookieName, strCookieValue); objCookie.Domain = strDomain; //设置Cookie的域名 System.Web.HttpContext.Current.Response.Cookies.Add(objCookie); return true; }
Cookie有三个属性需要注意一下: 1. Domain 域 2. Path 路径 3. Expires 过期时间
跨域操作需要设置域属性: Response.Cookies("MyCookie").Domain = "cnblogs.com"; (这里指的是泛域名) 这样在其它二级域名下就都可以访问到了, ASP 和 ASP.NET 测试通过
虚拟目录下访问: 我在ASP端做了下测试,.NET的没试, 如果不指定Path属性, 不同虚拟目录下Cookie无法共享 将Response.Cookies("MyCookie").Path = "/" 就可以了
总的写法: Response.Cookies("MyCookie").Domain = "cnblogs.com"; Response.Cookies("MyCookie").Path = "/" Response.Cookies("MyCookie").Expires = Now + 365; Response.Cookies("MyCookie")("Test") = "test";
.NET 清除Cookie HttpCookie cookie = System.Web.HttpContext.Current.Request.Cookies[cookiename]; if (cookie != null) { cookie.Values.Clear(); SetUserCookieExpireTime(cookiename, -1); cookie.Domain = _domain; System.Web.HttpContext.Current.Response.Cookies.Set(cookie); } public static void SetUserCookieExpireTime(string key, int days) { System.Web.HttpContext.Current.Response.Cookies[key].Domain = _domain; System.Web.HttpContext.Current.Response.Cookies[key].Path = _cookiepath; System.Web.HttpContext.Current.Response.Cookies[key].Expires = DateTime.Now.AddDays(days); } .NET 添加/更新Cookie public static void AddUserCookies(string key,string value, string cookiename, string domain) { HttpCookie cookie = System.Web.HttpContext.Current.Request.Cookies[cookiename]; if (cookie == null) { cookie = new HttpCookie(cookiename); cookie.Domain = domain; cookie.Path = _cookiepath;
cookie.Values.Add(key, value); HttpContext.Current.Response.AppendCookie(cookie); } else { if (System.Web.HttpContext.Current.Request.Cookies[cookiename].Values[key] != null) { cookie.Values.Set(key, value); } else { cookie.Domain = domain; cookie.Path = _cookiepath;
cookie.Values.Add(key, value); HttpContext.Current.Response.AppendCookie(cookie); } } }
这种写法实现cookie跨域跨目录
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