using System;
using System.Web;
using MvcMamcache.Models;

namespace MvcMamcache.Common {
    public class CheckLoginModule : IHttpModule {
        #region IHttpModule 成员

        public void Init(HttpApplication context) {
            context.AcquireRequestState += new EventHandler(OnRequest);
        }

        public void OnRequest(object source, EventArgs e) {
            HttpApplication application = source as HttpApplication;//得到Application
            HttpContext context = application.Context;//得到请求上下文.
            Uri url = context.Request.Url;//得到当前请求的URL

            if(url.AbsolutePath.ToLower() == "/home/index") {
                var httpCookie = context.Request.Cookies["SessionId"];
                if(httpCookie == null || Common.MemCacheHelper.GetValue(httpCookie.Value) == null) {//Session会话过期
                    //是否保留7天
                    if(context.Request.Cookies["ui1"] == null || context.Request.Cookies["ui2"] == null) {
                        context.Response.Redirect("/home/login");
                    } else {
                        //根据Cookie中保存的用户名与密码至数据库获取UserInfo对象  这里直接new
                        UserInfo userInfo = new UserInfo() {
                            LoginId = context.Request.Cookies["ui1"].Value,
                            LoginPwd = context.Request.Cookies["ui2"].Value
                        };
                        var sessionId = Guid.NewGuid().ToString();
                        context.Response.Cookies["SessionId"].Value = sessionId;
                        Common.MemCacheHelper.Insert(sessionId, userInfo);
                    }
                }
            }
        }

        public void Dispose() {
            throw new NotImplementedException();
        }
        #endregion
    }
}

using System;
using System.Web.Mvc;
using MvcMamcache.Models;

namespace MvcMamcache.Common {
    public class BaseController : Controller {
        protected UserInfo LoginUserInfo {
            get;
            set;
        }

        protected override void Initialize(System.Web.Routing.RequestContext requestContext) {
            base.Initialize(requestContext);
            if(requestContext.HttpContext.Request.Cookies["SessionId"] != null) {
                string guid = requestContext.HttpContext.Request.Cookies["SessionId"].Value;
                object obj = Common.MemCacheHelper.GetValue(guid);//根据Cookie的值从缓存中取出数据.
                if(obj != null) {
                    UserInfo model = obj as UserInfo;
                    LoginUserInfo = model;
                } else {
                    CheckCookieSevenDay(requestContext);//7天Cookie检验
                }
            } else {
                Response.Redirect("/home/login");
            }
        }

        private void CheckCookieSevenDay(System.Web.Routing.RequestContext requestContext) {
            var context = requestContext.HttpContext;
            if(context.Request.Cookies["ui1"] == null || context.Request.Cookies["ui2"] == null) {
                context.Response.Redirect("/home/login");
            } else {
                //根据Cookie中保存的用户名与密码至数据库获取UserInfo对象  这里直接new
                UserInfo userInfo = new UserInfo() {
                    LoginId = context.Request.Cookies["ui1"].Value,
                    LoginPwd = context.Request.Cookies["ui2"].Value
                };
                var sessionId = Guid.NewGuid().ToString();
                context.Response.Cookies["SessionId"].Value = sessionId;
                Common.MemCacheHelper.Insert(sessionId, userInfo);
            }
        }
    }
}