Cookies的使用

cookies常用来对用户的登录账号的密码进行记录在用户的电脑内，下次在登录本次网站的时候不需要再次登录。为了安全最好用到加密技术，避免盗取账号。接下来说明怎么使用，首先在第一次正确登录的时，需要把账号和密码写进用户本机的cookie。在验证正确登录以后执行一下代码：                Session["user"] = model;//保存session的值                if (!string.IsNullOrEmpty(Request.Form["checkMe"]))    //如果选中"checkMe"单选按钮添加cookies                {                    HttpCookie cookie1 = new HttpCookie("cp1",LoginId);                    HttpCookie cookie2 = new HttpCookie("cp2", Encrypt(LoginPwd));//在此密码用MD5加密                    cookie1.Expires = DateTime.Now.AddDays(3);                    cookie2.Expires = DateTime.Now.AddDays(3);                    Response.Cookies.Add(cookie1);                    Response.Cookies.Add(cookie2);              }下次登录的时候进行Cookie的验证： private void CheckCookie()//检查Cookies        {            if (Request.Cookies["cp1"]!=null&&Request.Cookies["cp2"]!=null)            {                BLL.UserManager bll = new BLL.UserManager();                string txtName = Request.Cookies["cp1"].Value;                Model.User model = bll.GetModel(txtName);                if (model!=null)                {                    string txtpawd = Request.Cookies["cp2"].Value;                    string encryptPwd = Encrypt(model.LoginPwd);                    if (txtpawd==encryptPwd)                    {                        Session["user"] = model;                        Response.Redirect("/member/ShowMsg.aspx?msg=登录成功" + "&txt=" + Server.UrlEncode("跳转到首页") + "&url=/Default.aspx");                    }                    else                    {                        Request.Cookies["cp1"].Expires = DateTime.Now.AddDays(-1);                        Request.Cookies["cp2"].Expires = DateTime.Now.AddDays(-1);                    }                }                             }