在分布式项目中使用memcached+cookie替代session

来源：互联网发布：网络爬虫英文编辑：程序博客网时间：2024/05/08 20:43

为什么要去session：多服务器不能共享，虽然有进程外session，但是性能很低

session局限性：

1.占用资源高
2.管理不方便
3.跨域、跨主机支持性很麻烦
4.性能差
5.容易产生系统垃圾
6.不稳定性，如：服务器重启后SESSION容易丢失

向客户端保存cookie：Response.Cookies.Add(HttpCookie的对象);
向服务端提交cookie：Request.Cookies[key];
设置属性：Response.Cookies[key].Expired=...;
小问题：这里也需要引入log4net，但是两个程序集的版本是不一致的，为了能够并存，可以到log4net源码中重新生成一个其它名称的程序集，如log4net_log
步骤：

（1）在cookie中存储guid值，每次请求上传这个值
（2）使用客户端对象，根据guid作为键进行查找对象

实例：分布式缓存去session登陆

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;using HM13OA.Common;using HM13OA.UI.Models;namespace HM13OA.UI.Controllers{    public class MyBaseController : Controller    {        protected override void OnAuthorization(AuthorizationContext filterContext)        {            //return;            //base.OnAuthorization(filterContext);            //去session，使用分布式缓存完成登录            //if (Session["UserLogin"] == null)            //{            //    filterContext.Result=new RedirectResult(Url.Action("Index","UserLogin"));            //}            //1、获取客户端标识            if (Request.Cookies.Get("loginId") == null)            {                filterContext.Result = new RedirectResult(Url.Action("Index", "UserLogin"));                return;            }            string key=Request.Cookies.Get("loginId").Value;            //2、与分布式缓存进行通信，获取对象            MmHelper helper=new MmHelper();            UserInfoViewModel userInfoViewModel = helper.Get(key) as UserInfoViewModel;            //3、判断是否登录            if (userInfoViewModel == null)            {                filterContext.Result = new RedirectResult(Url.Action("Index", "UserLogin"));                return;            }            //4、设置超时滑动时间            helper.Set(key, userInfoViewModel, DateTime.Now.AddMinutes(20));        }    }}

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;using DotNetOpenAuth.OpenId.Extensions.AttributeExchange;using HM13OA.Common;using HM13OA.IService;using HM13OA.Model;using HM13OA.UI.Models;namespace HM13OA.UI.Controllers{    public class UserLoginController : Controller    {        public IUserInfoService UserInfoService { get; set; }        public ActionResult Index()        {            return View();        }        public ActionResult ValidateCode()        {            ValidateCode vCode = new ValidateCode();            string code = vCode.CreateValidateCode(4);            Session["ValidateCode"] = code;            byte[] bytes = vCode.CreateValidateGraphic(code);            return File(bytes, @"image/jpeg");        }        [HttpPost]        public ActionResult Login(UserInfoViewModel userInfo)        {            string result = "no";            //判断是否是一个正常的请求            if (Session["ValidateCode"] == null || Session["ValidateCode"].ToString() == "")            {                return Content("请正常请求");            }            string vcode = Request["vCode"];            //先匹配验证码            if (Session["ValidateCode"].ToString().Equals(vcode,StringComparison.InvariantCultureIgnoreCase))            {                //根据用户名密码进行查询                if (UserInfoService.Login(new UserInfo()                {                    UserName = userInfo.UserName,                    UserPwd = userInfo.UserPwd                }))                {                    result = "ok";                    //去session，改成分布式缓存                    //Session["UserLogin"] = userInfo;                    //使用分布式缓存进行登录操作                    //1、创建标识                    string key = Guid.NewGuid().ToString();                    //2、向客户端写标识                   Response.Cookies.Add(new HttpCookie("loginId",key));                    //3、向分布式缓存服务器写信息                    MmHelper helper=new MmHelper();                    helper.Set(key, userInfo, DateTime.Now.AddMinutes(20));                }                else                {                    result = "用户名或密码错误";                    Session["ValidateCode"] = "";                }            }            else            {                //验证码不匹配                result = "验证码错误";                Session["ValidateCode"] = "";            }            return Content(result);        }        public ActionResult Logout()        {            //去session            //Session["UserInfo"] = null;            //使用分布式缓存的用户注销            if (Request.Cookies.Get("loginId") != null)            {                string key = Request.Cookies.Get("loginId").Value;                //1、更新客户端cookie                //Response.Cookies["loginId"].Expires = DateTime.Now.AddMinutes(-1);                //2、销毁分布式缓存中的对象                MmHelper helper=new MmHelper();                helper.Delete(key);            }            return RedirectToAction("Index");        }    }}

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using  Memcached.ClientLibrary;namespace HM13OA.Common{    public partial class MmHelper    {        private MemcachedClient client;        public MmHelper()        {            string[] ips = System.Configuration.ConfigurationManager.AppSettings["MemcachedServers"].Split(',');            SockIOPool pool = SockIOPool.GetInstance();            pool.SetServers(ips);            pool.Initialize();            client=new MemcachedClient();            client.EnableCompression = true;        }        public bool Set(string guid,object value,DateTime expiryTime)        {            return client.Set(guid, value, expiryTime);        }        public object Get(string guid)        {            return client.Get(guid);        }        public bool Delete(string guid)        {            return client.Delete(guid);        }    }}

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