asp的一个下载功能页面，就是把文件直接传给客户端的方式

< %
filepath = request.querystring( " filepath " )
filenames = Split (filepath, " / " )
filename = filenames( 1 )
Const  ForReading = 1
Const  TristateTrue =- 1   ' Unicode
Const  FILE_TRANSFER_SIZE = 16384   ' 16k
' Use the following line for IIS4/PWS - this is the default for IIS5
Response.Buffer  =   True

Function  TransferFile(path, mimeType, filename)
Dim  objFileSystem, objFile, objStream
Dim  char
Dim  sent
send = 0
TransferFile  =   True

Set  objFileSystem  =  Server.CreateObject( " Scripting.FileSystemObject " )
Set  objFile  =  objFileSystem.GetFile(Path)
Set  objStream  =  objFile.OpenAsTextStream(ForReading, TristateTrue)

Response.AddHeader  " content-type " , mineType

Response.ContentType  =   " application/octet-stream "

response.AddHeader  " Content-Disposition " , " attachment;filename= " & filename 
Response.AddHeader  " content-length " , objFile.Size

Do   While   Not  objStream.AtEndOfStream
char  =  objStream.Read( 1 )
Response.BinaryWrite(char)
sent  =  sent  +   1
If  (sent  MOD  FILE_TRANSFER_SIZE)  =   0   Then
Response.Flush
If   Not  Response.IsClientConnected  Then
TransferFile  =   False
Exit   Do
End   If
End   If
Loop

Response.Flush
If   Not  Response.IsClientConnected  Then  TransferFile  =   False

objStream.Close
Set  objStream  =   Nothing
Set  objFileSystem  =   Nothing
End Function

Dim  path, mimeType, sucess

path  =  Server.MapPath(filepath)
mimeType  =   " application/octet-stream "  
sucess  =  TransferFile(path, mimeType,filename)

Response.End
% >