使用asp下的adodb.stream 下载文件而不是打开

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 

程序代码: 

<% 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("/")&"/"&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 %>

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

但是这里有个问题就是直接将file.doc路径写在url里是不安全的，所以解决方案应该是将file.doc的路径存到数据库里，同过查找数据库后得到路径 

在这个程序的最前面如果加上一个判断： 

if instr(Request.ServerVariables("HTTP_REFERER"),"http://你的域名")=0 then    Response.End end if 

就能够很好的防止别人的盗链了.