download.asp

fdafaf af

<%
Function GetFileName(longname)'/folder1/folder2/file.asp=>file.asp
 while instr(longname,"/")
  longname = right(longname,len(longname)-1)
 wend
 GetFileName = longname
End Function
Dim Stream
Dim Contents
Dim FileName
Dim TrueFileName
Dim FileExt
Const adTypeBinary = 1
FileName=Request.QueryString("FileName")
work_name=trim(request.querystring("work_name"))
'字符过滤
if FileName = "" Then
    Response.Write "无效文件名！"
    Response.End
End if
FileExt = Mid(FileName, InStrRev(FileName, ".") + 1)'检查文件扩展名
Select Case UCase(FileExt)
    Case "ASP", "ASA", "ASPX", "ASAX", "MDB"
        Response.Write "非法操作！"
        Response.End
End Select
Response.Clear
if lcase(right(FileName,3))="gif" or lcase(right(FileName,3))="jpg" or lcase(right(FileName,3))="png" then
 Response.ContentType = "image/*" '对图像文件不出现下载对话框
else
 Response.ContentType = "application/ms-download"
end if
Response.AddHeader "content-disposition", "attachment; filename=" & GetFileName(Request.QueryString("FileName"))
Set Stream = server.CreateObject("ADODB.Stream")
Stream.Type = adTypeBinary
Stream.Open
TrueFileName = "upload/" & session("our_teacher") & "/" & session("student_class") & "/" & work_name & "/" & FileName
Stream.LoadFromFile Server.MapPath(TrueFileName)
While Not Stream.EOS
    Response.BinaryWrite Stream.Read(1024 * 64)
Wend
Stream.Close
Set Stream = Nothing
Response.Flush
Response.End
%>