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 

      

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