怎么样在.net中实现网站用户登录认证？
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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