<%@LANGUAGE="VBSCRIPT" CODEPAGE="65001"%>
<% Response.CodePage=65001%>
<% Response.Charset="UTF-8" %>
<%
'该程序通过使用ASP的FSO功能，减少数据库的读取。经测试，可以减少90%的服务器负荷。页面访问速度基本与静态页面相当。
'使用方法：将该文件放在网站里，然后在需要引用的文件的“第一行”用include引用即可。
'=======================参数区=============================
DirName="cachenew\" '静态文件保存的目录，结尾应带"\"。无须手动建立，程序会自动建立。
TimeDelay=30 '更新的时间间隔，单位为分钟，如1440分钟为1天。生成的静态文件在该间隔之后会被删除。
'======================主程序区============================
foxrax=Request("foxrax")
if foxrax="" then
FileName=GetStr()&".txt"
FileName=DirName&FileName
if tesfold(DirName)=false then'如果不存在文件夹则创建
createfold(Server.MapPath(".")&"\"&DirName)
end if
if ReportFileStatus(Server.MapPath(".")&"\"&FileName)=true then'如果存在生成的静态文件,则直接读取文件
Set FSO=CreateObject("Scripting.FileSystemObject")
Dim Files,LatCatch
Set Files=FSO.GetFile(Server.MapPath(FileName)) '定义CatchFile文件对象
LastCatch=CDate(Files.DateLastModified)
If DateDiff("n",LastCatch,Now())>TimeDelay Then'超过
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

'========================函数区============================
'获取当前页面url
Function GetStr()
'On Error Resume Next
Dim strTemps
strTemps = strTemps & Request.ServerVariables("HTTP_X_REWRITE_URL")
GetStr = Server.URLEncode(strTemps)
End Function
'获取缓存页面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

'抓取页面
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，文本数据
stm.Mode=3 'adModeReadWrite,读取写入，此参数用2则报错
stm.Charset="utf-8"
stm.Open
stm.WriteText list
stm.SaveToFile Server.MapPath(filePath),2 'adSaveCreateOverWrite，文件存在则覆盖
stm.Flush
stm.Close
set stm=nothing
End Sub

Function ReadFile(filePath)
dim stm
set stm=Server.CreateObject("adodb.stream")
stm.Type=1 'adTypeBinary，按二进制数据读入
stm.Mode=3 'adModeReadWrite ,这里只能用3用其他会出错
stm.Open
stm.LoadFromFile Server.MapPath(filePath)
stm.Position=0 '把指针移回起点
stm.Type=2 '文本数据
stm.Charset="utf-8"
ReadFile = stm.ReadText
stm.Close
set stm=nothing
End Function
'检测文件是否存在
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
'检测目录是否存在
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
'建立目录
sub createfold(foname)
set fs=createobject("scripting.filesystemobject")
fs.createfolder(foname)
set fs=nothing
end sub
'删除文件
function del_file(path) 'path，文件路径包含文件名
set objfso = server.createobject("scripting.FileSystemObject")
'path=Server.MapPath(path)
if objfso.FileExists(path) then '若存在则删除
objfso.DeleteFile(path) '删除文件
else
'response.write "<script language='Javascript'>alert('文件不存在')</script>"
end if
set objfso = nothing
end function
%>