ASP.NET 限制用户重复登录

来源：互联网发布：西安软件新城编辑：程序博客网时间：2024/05/19 23:15

实现方式，用户登录的时候记录用Session他的ID和登录时间。然后写入一个XML文件。以他的用户名命名，内容写入他的登录时间。登录后每个页面每20秒用Session的登录时间去比对写入的文件。如果正确则不用理会如果不正确则被被踢出。因为写入的文件如果不是同一用户名登录的话是不会更新的。

代码可以实现用户单一登录单点登录无限人次登录。稍微修改就可以实现了。

<%@ 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">

</head>

<body>

<div>

<asp:TextBox ID="txtUser" runat="server"></asp:TextBox>

<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="login" /><br />

</div>

</form>

</body>

</html>

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;

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 strUserId = txtUser.Text;

string times = DateTime.Now.ToString("yyyyMMddHHmmss");

string body = CourseXMLFileHeader + "<userTime>" + times + "</userTime></NewDataSet>";

string CourseFilePath =Server.MapPath(".") + "file://userlist//" + strUserId + ".XML";

if (!System.IO.File.Exists(CourseFilePath))

{

System.IO.FileStream NewText = System.IO.File.Create(CourseFilePath);

NewText.Close();

Session["SESSION_USERTIME"] = times;

Session["SESSION_USERName"] = strUserId;

}

else

{

System.IO.File.Delete(CourseFilePath);

System.IO.FileStream NewText = System.IO.File.Create(CourseFilePath);

NewText.Close();

Session["SESSION_USERTIME"] = times;

Session["SESSION_USERName"] = strUserId;

}

System.IO.StreamWriter sw = new System.IO.StreamWriter(CourseFilePath, true);

body = body.Replace("\'", "\"");

sw.WriteLine(body);

sw.Close();

Response.Redirect("Default.aspx");

}

public String CourseXMLFileHeader = @"<?xml version='1.0' standalone='yes'?><NewDataSet>";

}

default 页面

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

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

</head>

<body>

<asp:GridView ID="DataList1" runat="server">

</asp:GridView>

</form>

</body>

</html>

var x=0;

function myRefresh()

{

xRequest();

var result = "";

　 xmlHttp.open("Post", "test.aspx", false);

　　 xmlHttp.send("");

　　 result = xmlHttp.responseText;

　　 if(result!="ok")

{

alert("sorry,您的账号在别处登录");

location.href='logost.aspx';

}

x++;

if(x<20)

{

setTimeout("myRefresh()",20*1000);

}

myRefresh();

var xmlHttp;

function xRequest(){

if(window.XMLHttpRequest){

xmlHttp = new XMLHttpRequest(); //火狐浏览器。

}

else if(window.ActiveXObject){

xmlHttp = new ActiveXObject("Msxml2.XMLHTTP"); //IE浏览器。

if(!xmlHttp){xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");}

}

</script>

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.IO;

public partial class _Default : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

DirectoryInfo di = new DirectoryInfo(Server.MapPath(".") + "file://userlist//");

FileSystemInfo[] dis = di.GetFileSystemInfos();

if (dis.Length < 1)

{

Response.Write("<script>alert(\"目录是空的\");</script>");

}

else

{

foreach (FileSystemInfo fitemp in dis)

{

Response.Write(fitemp.Name + "<br>");

}

Test.aspx 这个页面是用来检查是否被顶只要写代码就可以了

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.IO;

using System.Xml;

public partial class test : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

string times = Session["SESSION_USERTIME"].ToString();

string userid= Session["SESSION_USERName"].ToString();

string CourseFilePath = Server.MapPath(".") + "file://userlist//" + userid + ".XML";

if (times.Equals(ReadXmlReturnNode(CourseFilePath, "userTime")))

{

this.Response.Write("ok");

this.Response.End();

}

else

{

this.Response.Write("no");

this.Response.End();

}

public static string ReadXmlReturnNode(string XmlPath, string Node)

{

XmlDocument docXml = new XmlDocument();

docXml.Load(@XmlPath);

XmlNodeList xn = docXml.GetElementsByTagName(Node);

return xn.Item(0).InnerText.ToString();

}

退出界面 logost .aspx

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;

public partial class logost : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

Session.Remove("SESSION_USERTIME");

Session.Remove("SESSION_USERName");

Response.Redirect("login.aspx");

}

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