%@LANGUAGE="VBSCRIPT" CODEPAGE="65001"%>
% Response.CodePage=65001%>
% Response.Charset="UTF-8" %>
%
'該程序通過使用ASP的FSO功能，減少數據庫的讀取。經測試，可以減少90%的服務器負荷。頁面訪問速度基本與靜態頁面相當。
'使用方法：將該文件放在網站里，然后在需要引用的文件的“第一行”用include引用即可。
'=======================參數區=============================
DirName="cachenew\" '靜態文件保存的目錄，結尾應帶"\"。無須手動建立，程序會自動建立。
TimeDelay=30 '更新的時間間隔，單位為分鐘，如1440分鐘為1天。生成的靜態文件在該間隔之后會被刪除。
'======================主程序區============================
foxrax=Request("foxrax")
if foxrax="" then
FileName=GetStr()".txt"
FileName=DirNameFileName
if tesfold(DirName)=false then'如果不存在文件夾則創建
createfold(Server.MapPath(".")"\"DirName)
end if
if ReportFileStatus(Server.MapPath(".")"\"FileName)=true then'如果存在生成的靜態文件,則直接讀取文件
Set FSO=CreateObject("Scripting.FileSystemObject")
Dim Files,LatCatch
Set Files=FSO.GetFile(Server.MapPath(FileName)) '定義CatchFile文件對象
LastCatch=CDate(Files.DateLastModified)
If DateDiff("n",LastCatch,Now())>TimeDelay Then'超過
List=getHTTPPage(GetUrl())
WriteFile(FileName)
Else
List=ReadFile(FileName)
End If
Set FSO = nothing
Response.Write(List)
Response.End()
else
List=getHTTPPage(GetUrl())
WriteFile(FileName)
end if

end if

'========================函數區============================
'獲取當前頁面url
Function GetStr()
'On Error Resume Next
Dim strTemps
strTemps = strTemps Request.ServerVariables("HTTP_X_REWRITE_URL")
GetStr = Server.URLEncode(strTemps)
End Function
'獲取緩存頁面url
Function GetUrl()
On Error Resume Next
Dim strTemp
If LCase(Request.ServerVariables("HTTPS")) = "off" Then
strTemp = "http://"
Else
strTemp = "https://"
End If
strTemp = strTemp Request.ServerVariables("SERVER_NAME")
If Request.ServerVariables("SERVER_PORT") > 80 Then
strTemp = strTemp ":" Request.ServerVariables("SERVER_PORT")
end if
strTemp = strTemp Request.ServerVariables("URL")
If Trim(Request.QueryString) > "" Then
strTemp = strTemp "?" Trim(Request.QueryString) "foxrax=foxrax"
else
strTemp = strTemp "?" "foxrax=foxrax"
end if
GetUrl = strTemp
End Function

'抓取頁面
Function getHTTPPage(url)
Set Mail1 = Server.CreateObject("CDO.Message")
Mail1.CreateMHTMLBody URL,31
AA=Mail1.HTMLBody
Set Mail1 = Nothing
getHTTPPage=AA
'Set Retrieval = Server.CreateObject("Microsoft.Xmlhttp")
'Retrieval.Open "GET",url,false,"",""
'Retrieval.Send
'getHTTPPage = Retrieval.ResponseBody
'Set Retrieval = Nothing
End Function
Sub WriteFile(filePath)
dim stm
set stm=Server.CreateObject("adodb.stream")
stm.Type=2 'adTypeText，文本數據
stm.Mode=3 'adModeReadWrite,讀取寫入，此參數用2則報錯
stm.Charset="utf-8"
stm.Open
stm.WriteText list
stm.SaveToFile Server.MapPath(filePath),2 'adSaveCreateOverWrite，文件存在則覆蓋
stm.Flush
stm.Close
set stm=nothing
End Sub

Function ReadFile(filePath)
dim stm
set stm=Server.CreateObject("adodb.stream")
stm.Type=1 'adTypeBinary，按二進制數據讀入
stm.Mode=3 'adModeReadWrite ,這里只能用3用其他會出錯
stm.Open
stm.LoadFromFile Server.MapPath(filePath)
stm.Position=0 '把指針移回起點
stm.Type=2 '文本數據
stm.Charset="utf-8"
ReadFile = stm.ReadText
stm.Close
set stm=nothing
End Function
'檢測文件是否存在
Function ReportFileStatus(FileName)
set fso = server.createobject("scripting.filesystemobject")
if fso.fileexists(FileName) = true then
ReportFileStatus=true
else
ReportFileStatus=false
end if
set fso=nothing
end function
'檢測目錄是否存在
function tesfold(foname)
set fs=createobject("scripting.filesystemobject")
filepathjm=server.mappath(foname)
if fs.folderexists(filepathjm) then
tesfold=True
else
tesfold= False
end if
set fs=nothing
end function
'建立目錄
sub createfold(foname)
set fs=createobject("scripting.filesystemobject")
fs.createfolder(foname)
set fs=nothing
end sub
'刪除文件
function del_file(path) 'path，文件路徑包含文件名
set objfso = server.createobject("scripting.FileSystemObject")
'path=Server.MapPath(path)
if objfso.FileExists(path) then '若存在則刪除
objfso.DeleteFile(path) '刪除文件
else
'response.write "script language='Javascript'>alert('文件不存在')/script>"
end if
set objfso = nothing
end function
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