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【Asp.NET】记住我功能

作者: / 发布于2017/5/23/ 845

不能用session的原因：sessionID是以cookie的形式存在浏览器端的内存中如果用户把浏览器关闭则sessionID就消失但是服务器端的session在过期时间内还是存在的等到浏览器在默认的过期时间内（20分钟）不在向服务器发送请求则过了20分钟 session销毁

前端简单模拟：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Login.aspx.cs" Inherits="RememberMe.Login" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
    <script type="text/javascript">
        window.onload = function () {
            document.getElementById('btnClose').onclick = function () {
                window.close();
            };
        };
    </script>
</head>
<body>
    <form id="form1" runat="server">
        <div style="text-align: center;">
            <table>
                <tr>
                    <td>用户名：
                        <input type="text" name="txtName" value="<%=uName %>" /></td>
                </tr>
                <tr>
                    <td>密码：<input type="password" name="txtPwd" value="<%=pwd %>" />
                    </td>
                </tr>
                <tr>
                    <td colspan="2">
                        <input type="checkbox" name="rememberMe" value="1" checked="checked" />记住我</td>
                </tr>
                <tr>
                    <td colspan="2">
                        <input type="submit" value="登录" />
                        <input type="button" value="关闭" id="btnClose" /></td>
                </tr>
            </table>

        </div>
    </form>
</body>
</html>

Login.aspx



后台代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace RememberMe
{
    public partial class Login : System.Web.UI.Page
    {
        protected string uName;
        protected string pwd;
        protected void Page_Load(object sender, EventArgs e)
        {

            if (Request.Cookies["user"] != null)
            {
                uName = Request.Cookies["user"].Values["n"];
                pwd = Request.Cookies["user"].Values["p"];
            }
            if (IsPostBack)
            {
                string userName = Request.Form["txtName"];
                string userPwd = Request.Form["txtPwd"];
                if (!string.IsNullOrEmpty(Request.Form["rememberMe"]))
                {
                    if (userName == "admin" && userPwd == "admin")
                    {
                        AlertAndRedirect("Index.aspx?n=" + userName, "登录成功");
                        HttpCookie cookie = new HttpCookie("user");
                        cookie["n"] = userName;
                        cookie["p"] = userPwd;
                        cookie.Expires = DateTime.Now.AddDays(7);
                        Response.Cookies.Add(cookie);
                    }
                    else
                    {
                        AlertAndRedirect("Login.aspx", "登录失败");
                        Response.Cookies["user"].Expires = DateTime.Now.AddDays(-1);
                    }
                }
                else
                {
                    Response.Cookies["user"].Expires = DateTime.Now.AddDays(-1);
                    if (userName == "admin" && userPwd == "admin")
                    {
                        AlertAndRedirect("Index.aspx?n=" + userName, "登录成功");
                    }
                    else
                    {
                        AlertAndRedirect("Login.aspx", "登录失败");
                    }
                }
            }

        }
        private void AlertAndRedirect(string redirectURL, string msg)
        {
            Response.Write("<script>alert('" + msg + "');window.location.href='" + redirectURL + "';</script>");
        }
    }
}

Login.aspx,cs

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