.net实现网站用户登录认证

private void SetAuthCookie(string userId, bool createPersistentCookie)
{
　　var ticket = new FormsAuthenticationTicket(2, userId, DateTime.Now, DateTime.Now.AddDays(7), true, "", FormsAuthentication.FormsCookiePath);
　　string ticketEncrypted = FormsAuthentication.Encrypt(ticket);

　　HttpCookie cookie;
　　if (createPersistentCookie)//是否在设置的过期时间内一直有效
　　{
　　　　cookie = new HttpCookie(FormsAuthentication.FormsCookieName, ticketEncrypted)
　　　　{
　　　　　　HttpOnly = true,
　　　　　　Path = FormsAuthentication.FormsCookiePath,
　　　　　　Secure = FormsAuthentication.RequireSSL,
　　　　　　Expires = ticket.Expiration,
　　　　　　Domain = "cnblogs.com"//这里设置认证的域名，同域名下包括子域名如aa.cnblogs.com或bb.cnblogs.com都保持相同的登录状态
　　　　};
　　}
　　else
　　{
　　　　cookie = new HttpCookie(FormsAuthentication.FormsCookieName, ticketEncrypted)
　　　　{
　　　　　　HttpOnly = true,
　　　　　　Path = FormsAuthentication.FormsCookiePath,
　　　　　　Secure = FormsAuthentication.RequireSSL,
　　　　　　//Expires = ticket.Expiration,//无过期时间的，浏览器关闭后失效
　　　　　　Domain = "cnblogs.com"
　　　　};
　　}

　　HttpContext.Current.Response.Cookies.Remove(FormsAuthentication.FormsCookieName);
　　HttpContext.Current.Response.Cookies.Add(cookie);
}

public bool IsAuthenticated
{
　　get
　　{
　　　　bool isPass = System.Web.HttpContext.Current.User.Identity.IsAuthenticated;

　　　　if (!isPass)
　　　　　　SignOut();

　　　　return isPass;
　　}
}

public string GetCurrentUserId()
{
   return _httpContext.User.Identity.Name;
}

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class Login : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void Button1_Click(object sender, EventArgs e)
{ 

string connString = Convert.ToString(ConfigurationManager.ConnectionStrings["001ConnectionString"]);
//001ConnectionString是我在webconfig里配置的数据库连接。
SqlConnection conn = new SqlConnection(connString); 
string strsql = "select * from User_table where User_name='" + UserName.Text + "' and Password='" + Password.Text + "'";
SqlCommand cmd = new SqlCommand(strsql, conn);
conn.Open();
SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);

if (dr.Read())
{ 
Response.Redirect("index.aspx");
conn.Close();
}
else
{
FailureText.Text = "登陆失败,请检查登陆信息!";
conn.Close();
Response.Write("");
}
}

protected void Button2_Click(object sender, EventArgs e) //文本框重置按钮
{
UserName.Text = "";
Password.Text = "";

}
}

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








 




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