asp磁盘缓存技术使用的代码

% 
Set MyCatch=new CatchFile 
MyCatch.Overdue=60*5    '修改过期时间设置为5个小时 
if MyCatch.CatchNow(Rev) then 
    response.write MyCatch.CatchData 
    response.end 
end if 
set MyCatch=nothing 
%>

主包含文件：FileCatch.asp
!--#include file="FileCatch-Inc.asp"-->
%
'---- 本文件用于签入原始文件，实现对页面的文件Catch
'---- 1、如果文件请求为POST方式，则取消此功能
'---- 2、文件的请求不能包含系统的识别关键字
'---- 3、作者 何直群 (www.wozhai.com)
Class CatchFile
        Public Overdue,Mark,CFolder,CFile '定义系统参数
        Private ScriptName,ScriptPath,ServerHost '定义服务器/页面参数变量
        Public CatchData        '输出的数据

        Private Sub Class_Initialize        '初始化函数
                '获得服务器及脚本数据
                ScriptName=Request.Servervariables("Script_Name") '识别出当前脚本的虚拟地址
                ScriptPath=GetScriptPath(false)        '识别出脚本的完整GET地址
                ServerHost=Request.Servervariables("Server_Name") '识别出当前服务器的地址

                '初始化系统参数
                Overdue=30        '默认30分钟过期
                Mark="NoCatch"        '无Catch请求参数为 NoCatch
                CFolder=GetCFolder        '定义默认的Catch文件保存目录
                CFile=Server.URLEncode(ScriptPath)".txt"        '将脚本路径转化为文件路径

                CatchData=""
        end Sub

        Private Function GetCFolder
                dim FSO,CFolder
                Set FSO=CreateObject("Scripting.FileSystemObject")        '设置FSO对象
                CFolder=Server.MapPath("/")"/FileCatch/"
                if not FSO.FolderExists(CFolder) then
                        fso.CreateFolder(CFolder)
                end if
                if Month(Now())10 then
                        CFolder=CFolder"/0"Month(Now())
                else
                        CFolder=CFolderMonth(Now())
                end if
                if Day(Now())10 then
                        CFolder=CFolder"0"Day(Now())
                else
                        CFolder=CFolderDay(Now())
                end if
                CFolder=CFolder"/"
                if not FSO.FolderExists(CFolder) then
                        fso.CreateFolder(CFolder)
                end if
                GetCFolder=CFolder
                set fso=nothing
        End Function

        Private Function bytes2BSTR(vIn)        '转换编码的函数
                dim StrReturn,ThisCharCode,i,NextCharCode
                strReturn = ""
                For i = 1 To LenB(vIn)
                        ThisCharCode = AscB(MidB(vIn,i,1))
                        If ThisCharCode H80 Then
                                strReturn = strReturn Chr(ThisCharCode)
                        Else
                                NextCharCode = AscB(MidB(vIn,i+1,1))
                                strReturn = strReturn Chr(CLng(ThisCharCode) * H100 + CInt(NextCharCode))
                                i = i + 1
                        End If
                Next
                bytes2BSTR = strReturn
        End Function

        Public Function CatchNow(Rev)        '用户指定开始处理Catch操作
                if UCase(request.Servervariables("Request_Method"))="POST" then
                '当是POST方法，不可使用文件Catch
                        Rev="使用POST方法请求页面，不可以使用文件Catch功能"
                        CatchNow=false
                else
                        if request.Querystring(Mark)>"" then
                        '如果指定参数不为空，表示请求不可以使用Catch
                                Rev="请求拒绝使用Catch功能"
                                CatchNow=false
                        else
                                CatchNow=GetCatchData(Rev)
                        end if
                end if
        End Function

        Private Function GetCatchData(Rev)        '读取Catch数据
                Dim FSO,IsBuildCatch
                Set FSO=CreateObject("Scripting.FileSystemObject")        '设置FSO对象，访问CatchFile

                If FSO.FileExists(CFolderCFile) Then
                        Dim File,LastCatch
                        Set File=FSO.GetFile(CFolderCFile)        '定义CatchFile文件对象
                        LastCatch=CDate(File.DateLastModified)
                        if DateDiff("n",LastCatch,Now())>Overdue then
                        '如果超过了Catch时间
                                IsBuildCatch=true
                        else
                                IsBuildCatch=false
                        end if
                        Set File=Nothing
                else
                        IsBuildCatch=true
                End if

                If IsBuildCatch then
                        GetCatchData=BuildCatch(Rev)        '如果需要创建Catch,则创建Catch文件，同时设置Catch的数据
                else
                        GetCatchData=ReadCatch(Rev)        '如果不需要创建Catch，则直接读取Catch数据
                End if

                Set FSO=nothing
        End Function

        Private Function GetScriptPath(IsGet)        '创建一个包含所有请求数据的地址
                dim Key,Fir
                GetScriptPath=ScriptName
                Fir=true
                for Each key in Request.QueryString
                        If Fir then
                                GetScriptPath=GetScriptPath"?"
                                Fir=false
                        else
                                GetScriptPath=GetScriptPath""
                        end if
                        GetScriptPath=GetScriptPathServer.URLEncode(Key)"="Server.URLEncode(Request.QueryString(Key))
                Next
                if IsGet then
                        If Fir then
                                GetScriptPath=GetScriptPath"?"
                                Fir=false
                        else
                                GetScriptPath=GetScriptPath""
                        end if
                        GetScriptPath=GetScriptPathServer.URLEncode(Mark)"=yes"
                end if
        End Function

        '创建Catch文件
        Private Function BuildCatch(Rev)
                Dim HTTP,Url,OutCome
                Set HTTP=CreateObject("Microsoft.XMLHTTP")
'                On Error Resume Next
'                response.write ServerHostGetScriptPath(true)
                HTTP.Open "get","http://"ServerHostGetScriptPath(true),False
                HTTP.Send

                if Err.number=0 then
                        CatchData=bytes2BSTR(HTTP.responseBody)
                        BuildCatch=True
                else
                        Rev="创建发生错误："Err.Description
                        BuildCatch=False
                        Err.clear
                end if

                Call WriteCatch

                set HTTP=nothing
        End Function

        Private Function ReadCatch(Rev)
                ReadCatch=IReadCatch(CFolderCFile,CatchData,Rev)
        End Function

        Private Sub WriteCatch
                Dim FSO,TSO
                Set FSO=CreateObject("Scripting.FileSystemObject")        '设置FSO对象，访问CatchFile
                set TSO=FSO.CreateTextFile(CFolderCFile,true)
                TSO.Write(CatchData)
                Set TSO=Nothing
                Set FSO=Nothing
        End Sub
End Class
%>  

%
Function IReadCatch(File,Data,Rev)
        Dim FSO,TSO
        Set FSO=CreateObject("Scripting.FileSystemObject")        '设置FSO对象，访问CatchFile
'        on error resume next
        set TSO=FSO.OpenTextFile(File,1,false)
        Data=TSO.ReadAll
        if Err.number>0 then
                Rev="读取发生错误："Err.Description
                ReadCatch=False
                Err.clear
        else
                IReadCatch=True
        end if
        Set TSO=Nothing
        Set FSO=Nothing
End Function
%>

%@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=10   '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。
TimeDelay=300
'======================主程序区============================

foxrax=Request("foxrax")
if foxrax="" then
 FileName=Server.URLEncode(GetStr())".txt"
 FileName=DirNameFileName
 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("URL") 
 If Trim(Request.QueryString) > "" Then 
 strTemps = strTemps  "?"  Trim(Request.QueryString) 
 else
 strTemps = strTemps 
 end if
 GetStr = 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)
  On Error Resume Next 
    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


'读取文件
'Public Function ReadFile( xVar )
 'xVar = Server.Mappath(xVar)
 'Set Sys = Server.CreateObject("Scripting.FileSystemObject") 
 'If Sys.FileExists( xVar ) Then 
 'Set Txt = Sys.OpenTextFile( xVar, 1,false) 
 'msg = Txt.ReadAll
 'Txt.Close 
 'Response.Write("yes")
 'Else
 'msg = "no"
 'End If 
 'Set Sys = Nothing
 'ReadFile = msg
'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 
%>