强制IE下载的代码

强制ie下载代码：
示例：
下载source/aaa.zip文件
<a href="download.asp?n=aaa.zip">

download.asp:
<%
Response.Buffer = true
Response.Clear

  dim url
  Dim fso,fl,flsize
  dim Dname
  Dim objStream,ContentType,flName,isre,url1
’*********************************************调用时传入的下载文件名
  Dname=trim(request("n"))    
‘******************************************************************
  If Dname<>"" Then
'******************************下载文件存放的服务端目录
    url=server.MapPath("../source")&"\"&Dname
‘***************************************************
  End If

  Set fso=Server.CreateObject("Scripting.FileSystemObject")
    Set fl=fso.getfile(url)
    flsize=fl.size
    flName=fl.name
    Set fl=Nothing
    Set fso=Nothing
  %>
  <%
    Set objStream = Server.CreateObject("ADODB.Stream")
    objStream.Open
    objStream.Type = 1
    objStream.LoadFromFile url
  
      
      Select Case lcase(Right(flName, 4))
        Case ".asf"
          ContentType = "video/x-ms-asf"
        Case ".avi"
          ContentType = "video/avi"
        Case ".doc"
          ContentType = "application/msword"
        Case ".zip"
          ContentType = "application/zip"
        Case ".xls"
          ContentType = "application/vnd.ms-excel"
        Case ".gif"
          ContentType = "image/gif"
        Case ".jpg", "jpeg"
          ContentType = "image/jpeg"
        Case ".wav"
          ContentType = "audio/wav"
        Case ".mp3"
          ContentType = "audio/mpeg3"
        Case ".mpg", "mpeg"
          ContentType = "video/mpeg"
        Case ".rtf"
          ContentType = "application/rtf"
        Case ".htm", "html"
          ContentType = "text/html"
        Case ".txt"
          ContentType = "text/plain"
        Case Else
          ContentType = "application/octet-stream"
      End Select

      
      Response.AddHeader "Content-Disposition", "attachment; filename=" & flName
      Response.AddHeader "Content-Length", flsize

      Response.Charset = "UTF-8"
      Response.ContentType = ContentType

      Response.BinaryWrite objStream.Read
      Response.Flush
      response.Clear()
    objStream.Close
    Set objStream = Nothing

%>