为了实现保持登录状态,可以用cookie来解决这一问题

假设过期时间为30分钟,校验发生在服务器,借助过滤器,可以这样写

public class PowerFilter : AuthorizeAttribute { public override void OnAuthorization(AuthorizationContext filterContext) { var cookie = HttpContext.Current.Request.Cookies["loginInfo"]; if(null == cookie) { filterContext.Result = new RedirectResult("/admin/login/index"); } else { cookie.Expires = DateTime.Now.AddMinutes(30); HttpContext.Current.Response.Cookies.Remove("loginInfo"); HttpContext.Current.Response.Cookies.Add(cookie); } } }

但是页面直接跳转了,也没有一个提示,显得不是很友好,可以这样

public class PowerFilter : AuthorizeAttribute { public override void OnAuthorization(AuthorizationContext filterContext) { var cookie = HttpContext.Current.Request.Cookies["loginInfo"]; if(null == cookie) { filterContext.Result = new ContentResult() { Content = string .Format("<script>alert('登录超时,请重新登录');location.href='{0}'</script>","/admin/login/index") }; } else { cookie.Expires = DateTime.Now.AddMinutes(30); HttpContext.Current.Response.Cookies.Remove("loginInfo"); HttpContext.Current.Response.Cookies.Add(cookie); } } }}

但是,假如是ajax请求呢?

public class PowerFilter : AuthorizeAttribute { public override void OnAuthorization(AuthorizationContext filterContext) { var cookie = HttpContext.Current.Request.Cookies["loginInfo"]; if(null == cookie) { if(!filterContext.HttpContext.Request.IsAjaxRequest()) { filterContext.Result = new ContentResult() { Content = string .Format("<script>alert('登录超时,请重新登录');location.href='{0}'</script>","/admin/login/index") }; } else { filterContext.Result = new JsonResult() { Data = new { logoff = true,logurl = "/admin/login/index" }, ContentType = null, ContentEncoding = null, JsonRequestBehavior = JsonRequestBehavior.AllowGet }; } } else { cookie.Expires = DateTime.Now.AddMinutes(30); HttpContext.Current.Response.Cookies.Remove("loginInfo"); HttpContext.Current.Response.Cookies.Add(cookie); } } }

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