我在们使用ASP.Net开发WEB网站时,有的时候是不让同一个用户名在同一时间进行多次登陆的。
为了不影响原来的整个网站,我选择使用了HttpModuler来实现。
先让所有的Page从自己的Page类:BasePage类继承,并实现 ISigleLogin接口。相关代码如下:
public
interface
ISingleLogin
{
string SigleUserLoginId { get; }
void SigleUserLogout();
}
{
string SigleUserLoginId { get; }
void SigleUserLogout();
}
public
class
BasePage : System.Web.UI.Page , BNet.Web.Modulers.ISingleLogin
{
public BasePage()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
if (Session["UserId"] == null)
{
Response.Write("你还没有登陆");
Response.Redirect("login.aspx");
}
}
#region ISingleLogin 成员
public string SigleUserLoginId
{
get
{
if (Session["UserId"] != null)
{
return Session["UserId"].ToString();
}
else
return "";
}
}
public void SigleUserLogout()
{
Session.Abandon();
Response.Write("你在别处已经登陆,强制退出本次登陆!");
}
#endregion
}
{
public BasePage()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
if (Session["UserId"] == null)
{
Response.Write("你还没有登陆");
Response.Redirect("login.aspx");
}
}
#region ISingleLogin 成员
public string SigleUserLoginId
{
get
{
if (Session["UserId"] != null)
{
return Session["UserId"].ToString();
}
else
return "";
}
}
public void SigleUserLogout()
{
Session.Abandon();
Response.Write("你在别处已经登陆,强制退出本次登陆!");
}
#endregion
}
然后在Web.config中加入HttpModuler:
<
system
.web
>
< httpModules >
< add name ="SingleLogin" type ="BNet.Web.Modulers.SingleLoginModuler" />
</ httpModules >
</ system.web >
< httpModules >
< add name ="SingleLogin" type ="BNet.Web.Modulers.SingleLoginModuler" />
</ httpModules >
</ system.web >
相关的SigleLoginModuler代码如下:[依评论修改后]
using
System;
using System.Collections.Generic;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.UI;
namespace BNet.Web.Modulers
{
/// <summary>
/// SingleLoginModuler 的摘要说明
/// </summary>
public class SingleLoginModuler : System.Web.IHttpModule
{
const string sigle_login_userid = "evlon_siglelogin_userid";
const string sigle_pre_logout_sessionid = "evlon_sigle_pre_logout_sessionid";
public static StringLifeValueDictionary UsableGetter(ref StringLifeValueDictionary dic)
{
if (dic == null)
{
dic = new StringLifeValueDictionary();
}
else
{
List<string> listRemove = new List<string>();
StringLifeValueDictionary.Enumerator iter = dic.GetEnumerator();
while (iter.MoveNext())
{
if (iter.Current.Value.life < DateTime.Now)
{
listRemove.Add(iter.Current.Key);
}
}
foreach (string key in listRemove)
{
dic.Remove(key);
}
}
return dic;
}
static StringLifeValueDictionary loginedUserIdDictionary = null;
static StringLifeValueDictionary LoginedUserIdDictionary
{
get
{
return UsableGetter(ref loginedUserIdDictionary);
}
}
static StringLifeValueDictionary preLogoutSessionIdDictionary = null;
static StringLifeValueDictionary PreLogoutSessionIdDictionary
{
get
{
return UsableGetter(ref preLogoutSessionIdDictionary);
}
}
public SingleLoginModuler()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
#region IHttpModule 成员
public void Dispose()
{
}
public void Init(HttpApplication context)
{
context.PreRequestHandlerExecute += new EventHandler(context_PreRequestHandlerExecute);
context.PostRequestHandlerExecute += new EventHandler(context_PostRequestHandlerExecute);
}
void context_PreRequestHandlerExecute(object sender, EventArgs e)
{
HttpApplication context = sender as HttpApplication;
IHttpHandler httpHandler = context.Context.CurrentHandler;
ISingleLogin sl = httpHandler as ISingleLogin;
if (sl != null)
{
string suid = sl.SigleUserLoginId;
if (suid != string.Empty)
{
if (PreLogoutSessionIdDictionary.ContainsKey(context.Session.SessionID))
{
//这个用户应该强制登出
PreLogoutSessionIdDictionary.Remove(context.Session.SessionID);
Page page = (Page)httpHandler;
page.PreInit += new EventHandler(page_PreInit);
}
else if (!LoginedUserIdDictionary.ContainsKey(suid))
{
LoginedUserIdDictionary.Add(suid, new LifeValue(context.Session.SessionID));
}
}
}
}
void page_PreInit(object sender, EventArgs e)
{
Page page = sender as Page;
ISingleLogin sl = page as ISingleLogin;
if (sl != null)
{
sl.SigleUserLogout();
page.Response.End();
}
}
void context_PostRequestHandlerExecute(object sender, EventArgs e)
{
//从LogineduserId 里找到和当前用户一样的用户ID的SessionId
HttpApplication context = sender as HttpApplication;
IHttpHandler httpHandler = context.Context.CurrentHandler;
ISingleLogin sl = httpHandler as ISingleLogin;
if (sl != null)
{
string suid = sl.SigleUserLoginId;
if (suid != string.Empty)
{
if (LoginedUserIdDictionary.ContainsKey(suid))
border-right: #808080 1px solid; border-top: #808080 1px so
using System.Collections.Generic;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.UI;
namespace BNet.Web.Modulers
{
/// <summary>
/// SingleLoginModuler 的摘要说明
/// </summary>
public class SingleLoginModuler : System.Web.IHttpModule
{
const string sigle_login_userid = "evlon_siglelogin_userid";
const string sigle_pre_logout_sessionid = "evlon_sigle_pre_logout_sessionid";
public static StringLifeValueDictionary UsableGetter(ref StringLifeValueDictionary dic)
{
if (dic == null)
{
dic = new StringLifeValueDictionary();
}
else
{
List<string> listRemove = new List<string>();
StringLifeValueDictionary.Enumerator iter = dic.GetEnumerator();
while (iter.MoveNext())
{
if (iter.Current.Value.life < DateTime.Now)
{
listRemove.Add(iter.Current.Key);
}
}
foreach (string key in listRemove)
{
dic.Remove(key);
}
}
return dic;
}
static StringLifeValueDictionary loginedUserIdDictionary = null;
static StringLifeValueDictionary LoginedUserIdDictionary
{
get
{
return UsableGetter(ref loginedUserIdDictionary);
}
}
static StringLifeValueDictionary preLogoutSessionIdDictionary = null;
static StringLifeValueDictionary PreLogoutSessionIdDictionary
{
get
{
return UsableGetter(ref preLogoutSessionIdDictionary);
}
}
public SingleLoginModuler()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
#region IHttpModule 成员
public void Dispose()
{
}
public void Init(HttpApplication context)
{
context.PreRequestHandlerExecute += new EventHandler(context_PreRequestHandlerExecute);
context.PostRequestHandlerExecute += new EventHandler(context_PostRequestHandlerExecute);
}
void context_PreRequestHandlerExecute(object sender, EventArgs e)
{
HttpApplication context = sender as HttpApplication;
IHttpHandler httpHandler = context.Context.CurrentHandler;
ISingleLogin sl = httpHandler as ISingleLogin;
if (sl != null)
{
string suid = sl.SigleUserLoginId;
if (suid != string.Empty)
{
if (PreLogoutSessionIdDictionary.ContainsKey(context.Session.SessionID))
{
//这个用户应该强制登出
PreLogoutSessionIdDictionary.Remove(context.Session.SessionID);
Page page = (Page)httpHandler;
page.PreInit += new EventHandler(page_PreInit);
}
else if (!LoginedUserIdDictionary.ContainsKey(suid))
{
LoginedUserIdDictionary.Add(suid, new LifeValue(context.Session.SessionID));
}
}
}
}
void page_PreInit(object sender, EventArgs e)
{
Page page = sender as Page;
ISingleLogin sl = page as ISingleLogin;
if (sl != null)
{
sl.SigleUserLogout();
page.Response.End();
}
}
void context_PostRequestHandlerExecute(object sender, EventArgs e)
{
//从LogineduserId 里找到和当前用户一样的用户ID的SessionId
HttpApplication context = sender as HttpApplication;
IHttpHandler httpHandler = context.Context.CurrentHandler;
ISingleLogin sl = httpHandler as ISingleLogin;
if (sl != null)
{
string suid = sl.SigleUserLoginId;
if (suid != string.Empty)
{
if (LoginedUserIdDictionary.ContainsKey(suid))
border-right: #808080 1px solid; border-top: #808080 1px so
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