最近做了个小论坛，需要用到统计在线的会员名单和游客的人数，经过上午的调试，总于产生了下面的代码。
总要的思路是 ：在服务器端用application 保存用户名及用户最后的登陆时间。用户的每次访问都将检查现在的时间与保存在application 中的每个用户最后登陆时间之差是否大于设定的时间如过大于，则把该用户从application中剔除.
REM application("Total_Land_User") 是会员在线登陆的数目 REM application("Online_Land_User") 是在线会员的名单数组
Sub Inline_State()
Dim Forums_ As New Forums Dim Timer As Int32 = 1 Dim temp_Land_User(), temp_User(), User_name, Land_User, User As String Dim Num, i As Int32 Application.Lock() If Session("User_name") <> "" Then Land_User = Session("User_name") If Application(Land_User & "LandUser_LastAccessTime") = Nothing Then '假如第一次登陆 If Application("Total_Land_User") = 0 Then Application.Set("Total_Land_User", 0) '假如登陆用户数为0 ReDim temp_Land_User(Application("Total_Land_User") + 1) Num = 0 If Application("Total_Land_User") > 0 Then For i = Application("Online_Land_User").GetLowerBound(0) To Application("Online_Land_User").GetUpperBound(0) - 1 User_name = Application("Online_Land_User")(i) ' Response.Write("清点用户是的用户是：" & User_name & "<br>") If User_name <> Land_User Then temp_Land_User(Num) = User_name Num += 1 Else Application(Land_User & "LandUser_LastAccessTime") = Nothing End If Next End If temp_Land_User(Num) = Land_User '重新把登陆用户放到数组最后 Application("Total_Land_User") = Num + 1 ReDim Preserve temp_Land_User(Application("Total_Land_User")) Application.Set("Online_Land_User", temp_Land_User) End If ' Response.Write("<br>总的用户数是:" & Application("Total_Land_User")) ' Response.Write("<br> Application(Online_Land_User).GetLowerBound(0):" & Application("Online_Land_User").GetLowerBound(0)) ' Response.Write("<br> Application(Online_Land_User).GetUpperBound(0):" & Application("Online_Land_User").GetUpperBound(0)) ' Response.Write("<br>用户列表是:") ' For i = Application("Online_Land_User").GetLowerBound(0) To Application("Online_Land_User").GetUpperBound(0) - 1 ' Response.Write("<br>" & Application("Online_Land_User")(i)) ' Response.Write(" 最后登陆时间为:" & Application(Application("Online_Land_User")(i) & "LandUser_LastAccessTime")) ' Next Application(Land_User & "LandUser_LastAccessTime") = System.DateTime.Now '记录登陆时间 ReDim temp_Land_User(Application("Total_Land_User")) Num = 0 For i = 0 To Application("Total_Land_User") - 1 User_name = Application("Online_Land_User")(i) Dim D_date As DateTime = CType(Application(User_name & "LandUser_LastAccessTime"), DateTime) If (System.DateTime.Now < D_date.AddMinutes(Timer)) Then temp_Land_User(Num) = User_name Num += 1 Else Application(Land_User & "LandUser_LastAccessTime") = Nothing End If Next If Num <> Application("Total_Land_User") Then ReDim Preserve temp_Land_User(Num) Application("Online_Land_User") = temp_Land_User ' 在线登陆用户数组 Application("Total_Land_User") = Num + 1 ' End If Else '游客的统计 User = Session.SessionID If Application(User & "LastAccessTime") = Nothing Then '假如第一次登陆 If Application("Total_User") = 0 Then Application.Set("Total_User", 0) '假如登陆用户数为0 ReDim temp_User(Application("Total_User") + 1) Num = 0 If Application("Total_User") > 0 Then For i = Application("Online_User").GetLowerBound(0) To Application("Online_User").GetUpperBound(0) - 1 User_name = Application("Online_User")(i) If User_name <> User Then temp_User(Num) = User_name Num += 1 Else ' Application(User & "User_LastAccessTime") = Nothing End If Next End If temp_User(Num) = User '重新把登陆用户session.sessionid放到数组最后 Application("Total_User") = Num + 1 ReDim Preserve temp_User(Application("Total_User")) Application.Set("Online_User", temp_User) End If 'Response.Write("<br>总的用户数是:" & Application("Total_User")) 'Response.Write("<br> Application(Online_User).GetLowerBound(0):" & Application("Online_User").GetLowerBound(0)) 'Response.Write("<br> Application(Online_User).GetUpperBound(0):" & Application("Online_User").GetUpperBound(0)) 'Response.Write("<br>用户列表是:") 'For i = Application("Online_User").GetLowerBound(0) To Application("Online_User").GetUpperBound(0) - 1 ' Response.Write("<br>" & Application("Online_User")(i)) ' Response.Write(" 最后登陆时间为:" & Application(Application("Online_User")(i) & "User_LastAccessTime")) 'Next Application(User & "User_LastAccessTime") = System.DateTime.Now '记录登陆时间 '检测过期的 ReDim temp_User(Application("Total_User")) Num = 0 For i = 0 To Application("Total_User") - 1 User_name = Application("Online_User")(i) Dim D_date As DateTime = CType(Application(User_name & "User_LastAccessTime"), DateTime) If (System.DateTime.Now < D_date.AddMinutes(Timer)) Then temp_User(Num) = User_name Num += 1 Else Application(User & "User_LastAccessTime") = Nothing End If Next If Num <> Application("Total_User") Then ReDim Preserve temp_User(Num) Application("Online_User") = temp_User '在线的游客session.sessionid数组 Application("Total_User") = Num + 1 '在线游客数量 End If End If Dim str_ As New System.Text.StringBuilder Me._Total_user_num.Text = Application("Total_User") + Application("Total_Land_User") Me._Total_notland_num.Text = Application("Total_User") & "人" If IsArray(Application("Online_Land_User")) Then For i = Application("Online_Land_User").GetLowerBound(0) To Application("Online_Land_User").GetUpperBound(0) - 1 User_name = Application("Online_Land_User")(i) str_ = str_.Append(User_name & ",") Next Me._Total_land_num.Text = str_.ToString End If Application.UnLock()
End Sub
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