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利用HttpModuler实现WEB程序同一时间只让一个用户实例登陆
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();
}
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
"
);
}
}
ISingleLogin 成员
#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
>
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
{
/**/
///
///
SingleLoginModuler 的摘要说明
///
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
//
}
IHttpModule 成员
#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))
{
string
sessionId
=
LoginedUserIdDictionary[suid].value;
if
(sessionId
!=
context.Session.SessionID)
{
if
(
!
PreLogoutSessionIdDictionary.ContainsKey(sessionId))
{
PreLogoutSessionIdDictionary.Add(sessionId,
new
LifeValue(suid));
}
LoginedUserIdDictionary.Remove(suid);
}
}
else
{
LoginedUserIdDictionary.Add(sl.SigleUserLoginId,
new
LifeValue(context.Session.SessionID));
}
}
}
}
#endregion
}
public
class
LifeValue
{
public
string
value;
public
DateTime life;
public
LifeValue(
string
value)
{
this
.value
=
value;
this
.life
=
DateTime.Now.AddMinutes(HttpContext.Current.Session.Timeout
+
5
);
}
}
public
class
StringLifeValueDictionary : Dictionary
<
string
, LifeValue
>
{
}
public
interface
ISingleLogin
{
string
SigleUserLoginId
{
get
; }
void
SigleUserLogout();
}
}
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原文地址:https://www.cnblogs.com/KUDO/p/443388.html
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