asp防止刷新功能实现代码

<%
Const VarNameDateArr="www_domai_net_App_DataArr" '队列名称
Const VarNameIPArr="www_domai_net_App_IPArr" '队列名称
Dim objAntiRefresh
Set objAntiRefresh= new AntiRefresh
objAntiRefresh.BufferSize=100 '队列大小
objAntiRefresh.CacheItemAvailTime=2 '间隔时间
If Not objAntiRefresh.IsValidAccess() Then
Set objAntiRefresh=Nothing
Response.Write("您的访问过去频繁请2秒后再试.")
Response.End()
End If
Set objAntiRefresh=Nothing
%>

<%
'***************************************
'* 页面防刷新模块 *
'* WDFrog,2007-8-16
'***************************************
Class AntiRefresh
Private IPArr,DateArr
Private m_BufferSize
Private m_CacheItemAvailTime
Private Sub Class_Initialize()
Application.Lock()
m_BufferSize=100
m_CacheItemAvailTime=2
End Sub
Private Sub Class_Terminate()
Application.UnLock()
End Sub
Public Property Get CacheItemAvailTime
CacheItemAvailTime=m_CacheItemAvailTime
End Property
Public Property Let CacheItemAvailTime(Value)
m_CacheItemAvailTime=Value
End Property
Public Property Get BufferSize
BufferSize=m_BufferSize
End Property
Public Property Let BufferSize(Value)
m_BufferSize=Value
End Property
Private Sub EnsureArr()
If IsArray(Application(VarNameDateArr)) Then
DateArr=Application(VarNameDateArr)
Else
ReDim DateArr(BufferSize)
End If
If IsArray(Application(VarNameIPArr)) Then
IPArr=Application(VarNameIPArr)
Else
ReDim IPArr(BufferSize)
End If
End Sub
Public Function IsValidAccess()
Dim ip,i
ip=GetIP()
IsValidAccess=True
EnsureArr()
For i=1 To BufferSize
If IPArr(i)=ip Then
If DateDiff("s",CDate(DateArr(i)),Now()) < CacheItemAvailTime Then
IsValidAccess=False
Exit Function
End If
End If
Next
Call QueueHandle()
DateArr(1)=Now()
IPArr(1)=ip
Application(VarNameIPArr)=IPArr
Application(VarNameDateArr)=DateArr
End Function
Public Function ClearCache()
Set Application(VarNameDateArr)=Nothing
Set Application(VarNameIPArr)=Nothing
End Function
Private Sub QueueHandle()
Dim i,j
For i=BufferSize-1 To 1 Step -1
DateArr(i+1)=DateArr(i)
Next
For j=BufferSize-1 To 1 Step -1
IPArr(j+1)=IPArr(j)
Next
End Sub
Private Function GetIP()
Dim strIPAddr
If Request.ServerVariables("HTTP_X_FORWARDED_FOR") = "" OR InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), "unknown") > 0 Then
strIPAddr = Request.ServerVariables("REMOTE_ADDR")
ElseIf InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ",") > 0 Then
strIPAddr = Mid(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), 1, InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ",")-1)
ElseIf InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ";") > 0 Then
strIPAddr = Mid(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), 1, InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ";")-1)
Else
strIPAddr = Request.ServerVariables("HTTP_X_FORWARDED_FOR")
End If
GetIP = (Trim(Mid(strIPAddr, 1, 30)))
End Function
End Class
%>

Sub chkreflash()
    dim ScriptName
    ScriptName=lcase(request.ServerVariables("PATH_INFO"))
    dim posttime,DoReflashPage,ReflashPage,SplitReflashPage
    posttime=1 '防止刷新时间
    DoReflashPage=false
    ReflashPage="|Article_one.asp"
    SplitReflashPage=split(ReflashPage,"|")
        for i=0 to ubound(SplitReflashPage)
             if instr(scriptname,SplitReflashPage(i))>0 then
                DoReflashPage=true
            exit for
             end if
        next
    if (not isnull(session("ReflashTime"))) and posttime>0 and DoReflashPage then
        if DateDiff("s",session("ReflashTime"),Now())<posttime then
            call msg("警告！系统已记录您的IP，和刷新次数。\n\n请不要在"&posttime&"秒内连续刷新本页面！","-1")
        else
        session("ReflashTime")=Now()
        end if
    elseif isnull(session("ReflashTime")) and posttime>0 and DoReflashPage then
        Session("ReflashTime")=Now()
    end if
End Sub