利用adodb.stream直接下载任何后缀的文件(防盗链)

原作:possible_Y,载自时代课堂

在浏览器的地址栏里直接输入一个doc或xls或jpg的文件的url路径，那么该文件会直接显示在浏览器里。而在很多时候我们希望能直接弹出下载提示框让用户下载，我们该怎么办呢？这里有两种方法：
1、设置你的服务器的iis，给doc等后缀名做映射
2、在向客户端发送时设置其contenttype

下面详细说明方法2

<%
Re***nse.Buffer = true
Re***nse.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
 ur***erver.MapPath("/")&""&Dname
'***************************************************
End If

Set fs***erver.CreateObject("Sc***ting.FileSystemObject")
 Set fl***o.getfile(url)
 fl***e=fl.size
 fl***e=fl.name
 Set fl=Nothing
 Set fso=Nothing
%>
<%
 Set objStream = Se***r.CreateObject("AD***.Stream")
 ob***ream.Open
 ob***ream.Type = 1
 ob***ream.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 = "ap***cation/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

  Re***nse.AddHeader "Content-Disposition", "attachment; filename=" & flName
  Re***nse.AddHeader "Content-Length", flsize

  Re***nse.Charset = "UTF-8"
  Re***nse.ContentType = ContentType

  Re***nse.BinaryWrite ob***ream.Read
  Re***nse.Flush
  re***nse.Clear()
 ob***ream.Close
 Set objStream = Nothing

%>

将下面的东西存成do***oad.asp然后你就可以用do***oad.asp?n=file.doc">download!http://www.downcodes.com/do***oad.asp?n=file.doc">download!>来下载同一目录下的file.doc了!