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.net实现网站用户登录认证

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

cookie登录后同域名下的网站保持相同的登录状态。

登录

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);
}

这样登录后,在同域名下的任何页面都可以得到用户状态

判断用户是否登录

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

    if (!isPass)
      SignOut();

    return isPass;
  }
}

得到当前的用户名

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

下面给大家一个具体的实例

CS页代码:

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("<script language=javascript>alert('登陆失败!.');</script>");
}
}

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

}
}

下面是aspx页面代码:

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns=" http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server"> 
<asp:Panel ID="Panel1" runat="server" Height="101px" Width="231px" Wrap="False">
<table>
<tr>
<td align="center" colspan="2">
用户登陆</td>
</tr>
<tr>
<td style="width: 89px">
用户名:</td>
<td style="width: 100px">
<asp:TextBox ID="UserName" runat="server" Wrap="False"></asp:TextBox></td>
</tr>
<tr>
<td style="width: 89px">
密码:</td>
<td style="width: 100px">
<asp:TextBox ID="Password" runat="server" TextMode="Password" Width="148px" Wrap="False" ></asp:TextBox></td>
</tr>
<tr>
<td align="center" colspan="2" style="text-align: center">
<asp:Button ID="Button1" runat="server" Text="登陆" Width="50px" OnClick="Button1_Click" />
<asp:Button ID="Button2" runat="server" Text="重置" Width="50px" OnClick="Button2_Click" /></td>
</tr>
<tr>
<td align="center" colspan="2">
<asp:Label ID="FailureText" runat="server" Width="77px"></asp:Label></td>
</tr>
</table>
</asp:Panel>

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


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