用asp实现文件浏览、上传、下载的程序

答案：可以放在服务器上，对服务器上的文件进行浏览、上传、下载，可下载文件源码。 
把下所有代码入在一个文件里即可，文件的后缀要为asp。 
[复制此代码]CODE:

<%  
thedir = request("thedir")  
if thedir = "" then  
 folderini = server.mappath(".")&"\"  
else  
 folderini = server.mappath(thedir)&"\"  
end if  
foldinfo=trim(Request.Querystring("foldinfo"))  
if foldinfo = "" then  
 foldinfo = folderini  
end if  
class clsUp  
Dim Form,File  
Dim AllowExt_   
Dim NoAllowExt_   
Private oUpFileStream   
Private isErr_    
Private ErrMessage_   
Private isGetData_   
Public Property Get Version  
 Version="v1.0.0"  
End Property  
Public Property Get isErr  
 isErr=isErr_  
End Property  
Public Property Get ErrMessage  
 ErrMessage=ErrMessage_  
End Property  
Public Property Get AllowExt  
 AllowExt=AllowExt_  
End Property  
Public Property Let AllowExt(Value)   
 AllowExt_=LCase(Value)  
End Property  
Public Property Get NoAllowExt  
 NoAllowExt=NoAllowExt_  
End Property  
Public Property Let NoAllowExt(Value)  
 NoAllowExt_=LCase(Value)  
End Property  
Private Sub Class_Initialize  
 isErr_ = 0  
 NoAllowExt=""    
 NoAllowExt=LCase(NoAllowExt)  
 AllowExt=""    
 AllowExt=LCase(AllowExt)  
 isGetData_=false  
End Sub  
Private Sub Class_Terminate   
 on error Resume Next  
 Form.RemoveAll  
 Set Form = Nothing  
 File.RemoveAll  
 Set File = Nothing  
 oUpFileStream.Close  
 Set oUpFileStream = Nothing  
End Sub  
Public Sub GetData (MaxSize)  
 on error Resume Next  
 if isGetData_=false then   
  Dim getupdata1,sSpace,bCrLf,sInfo,iInfoStart,iInfoEnd,tStream,iStart,oFileInfo  
  Dim sFormValue,sFileName  
  Dim iFindStart,iFindEnd  
  Dim iFormStart,iFormEnd,sFormName  
  If Request.TotalBytes < 1 Then   
   isErr_ = 1  
   ErrMessage_=""  
   Exit Sub  
  End If  
  If MaxSize > 0 Then   
   If Request.TotalBytes > MaxSize Then  
   isErr_ = 2   
   ErrMessage_=""  
   Exit Sub  
   End If  
  End If  
  Set Form = Server.CreateObject ("Scripting.Dictionary")  
  Form.CompareMode = 1  
  Set File = Server.CreateObject ("Scripting.Dictionary")  
  File.CompareMode = 1  
  Set tStream = Server.CreateObject ("ADODB.Stream")  
  Set oUpFileStream = Server.CreateObject ("ADODB.Stream")  
  oUpFileStream.Type = 1  
  oUpFileStream.Mode = 3  
  oUpFileStream.Open   
  oUpFileStream.Write Request.BinaryRead (Request.TotalBytes)  
  oUpFileStream.Position = 0  
  getupdata1 = oUpFileStream.Read   
  iFormEnd = oUpFileStream.Size  
  bCrLf = ChrB (13) & ChrB (10)  
  sSpace = MidB (getupdata1,1, InStrB (1,getupdata1,bCrLf)-1)  
  iStart = LenB(sSpace)  
  iFormStart = iStart+2  
  Do  
   iInfoEnd = InStrB (iFormStart,getupdata1,bCrLf & bCrLf)+3  
   tStream.Type = 1  
   tStream.Mode = 3  
   tStream.Open  
   oUpFileStream.Position = iFormStart  
   oUpFileStream.CopyTo tStream,iInfoEnd-iFormStart  
   tStream.Position = 0  
   tStream.Type = 2  
   tStream.CharSet = "gb2312"  
   sInfo = tStream.ReadText     
   iFormStart = InStrB (iInfoEnd,getupdata1,sSpace)-1  
   iFindStart = InStr (22,sInfo,"name=""",1)+6  
   iFindEnd = InStr (iFindStart,sInfo,"""",1)  
   sFormName = Mid (sinfo,iFindStart,iFindEnd-iFindStart)  
   If InStr (45,sInfo,"filename=""",1) > 0 Then  
    Set oFileInfo = new clsFileInfo  
    iFindStart = InStr (iFindEnd,sInfo,"filename=""",1)+10  
    iFindEnd = InStr (iFindStart,sInfo,""""&vbCrLf,1)  
    sFileName = Mid (sinfo,iFindStart,iFindEnd-iFindStart)  
    oFileInfo.FileName = GetFileName(sFileName)  
    oFileInfo.FilePath = GetFilePath(sFileName)  
    oFileInfo.FileExt = GetFileExt(sFileName)  
    iFindStart = InStr (iFindEnd,sInfo,"Content-Type: ",1)+14  
    iFindEnd = InStr (iFindStart,sInfo,vbCr)  
    oFileInfo.FileMIME = Mid(sinfo,iFindStart,iFindEnd-iFindStart)  
    oFileInfo.FileStart = iInfoEnd  
    oFileInfo.FileSize = iFormStart -iInfoEnd -2  
    oFileInfo.FormName = sFormName  
    file.add sFormName,oFileInfo  
   else  
    tStream.Close  
    tStream.Type = 1  
    tStream.Mode = 3  
    tStream.Open  
    oUpFileStream.Position = iInfoEnd   
    oUpFileStream.CopyTo tStream,iFormStart-iInfoEnd-2  
    tStream.Position = 0  
    tStream.Type = 2  
    tStream.CharSet = "gb2312"  
    sFormValue = tStream.ReadText  
    If Form.Exists (sFormName) Then  
     Form (sFormName) = Form (sFormName) & ", " & sFormValue  
     else  
     Form.Add sFormName,sFormValue  
    End If  
   End If  
   tStream.Close  
   iFormStart = iFormStart+iStart+2  
  Loop Until (iFormStart+2) >= iFormEnd   
  getupdata1 = ""  
  Set tStream = Nothing  
  isGetData_=true  
 end if  
End Sub  
Public Function SaveToFile(Item,Path)  
 SaveToFile=SaveToFileEx(Item,Path,True)  
End Function  
Public Function AutoSave(Item,Path)  
 AutoSave=SaveToFileEx(Item,Path,false)  
End Function  
Private Function SaveToFileEx(Item,Path,Over)  
 On Error Resume Next  
 Dim oFileStream  
 Dim tmpPath  
 Dim nohack  
 isErr=0  
 Set oFileStream = CreateObject ("ADODB.Stream")  
 oFileStream.Type = 1  
 oFileStream.Mode = 3  
 oFileStream.Open  
 oUpFileStream.Position = File(Item).FileStart  
 oUpFileStream.CopyTo oFileStream,File(Item).FileSize  
 nohack=split(path,".")  
 tmpPath=nohack(0)&"."&nohack(ubound(nohack))  
 if Over then  
  if isAllowExt(GetFileExt(tmpPath)) then  
   oFileStream.SaveToFile tmpPath,2  
   Else  
   isErr_=3  
   ErrMessage_="!"  
  End if  
 Else  
  Path=GetFilePath(Path)  
  if isAllowExt(File(Item).FileExt) then  
   do  
    Err.Clear()  
    nohack=split(Path&GetNewFileName()&"."&File(Item).FileExt,".")   
    tmpPath=nohack(0)&"."&nohack(ubound(nohack))  
    oFileStream.SaveToFile tmpPath  
   loop Until Err.number<1  
   oFileStream.SaveToFile Path  
   Else  
   isErr_=3  
   ErrMessage_="该后缀名的文件不允许上传!"  
  End if  
 End if  
 oFileStream.Close  
 Set oFileStream = Nothing  
 if isErr_=3 then SaveToFileEx="" else SaveToFileEx=GetFileName(tmpPath)  
End Function  
'取得文件数据  
Public Function FileData(Item)  
 isErr_=0  
 if isAllowExt(File(Item).FileExt) then  
  oUpFileStream.Position = File(Item).FileStart  
  FileData = oUpFileStream.Read (File(Item).FileSize)  
  Else  
  isErr_=3  
  ErrMessage_=""  
  FileData=""  
 End if  
End Function  
Public function GetFilePath(FullPath)  
  If FullPath <> "" Then  
    GetFilePath = Left(FullPath,InStrRev(FullPath, "\"))  
    Else  
    GetFilePath = ""  
  End If  
End function  
Public Function GetFileName(FullPath)  
  If FullPath <> "" Then  
    GetFileName = mid(FullPath,InStrRev(FullPath, "\")+1)  
    Else  
    GetFileName = ""  
  End If  
End function  
Public Function GetFileExt(FullPath)  
  If FullPath <> "" Then  
    GetFileExt = LCase(Mid(FullPath,InStrRev(FullPath, ".")+1))  
    Else  
    GetFileExt = ""  
  End If  
End function  
Public Function GetNewFileName()  
 dim ranNum  
 dim dtNow  
 dtNow=Now()  
 ranNum=int(90000*rnd)+10000  
 GetNewFileName=year(dtNow) & right("0" & month(dtNow),2) & right("0" & day(dtNow),2) & right("0" & hour(dtNow),2) & right("0" & minute(dtNow),2) & right("0" & second(dtNow),2) & ranNum  
End Function  
Public Function isA

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