在瀏覽器的地址欄里直接輸入一個doc或xls或jpg的文件的url路徑，那么該文件會直接顯示在瀏覽器里。而在很多時候我們希望能直接彈出下載提示框讓用戶下載，我們該怎么辦呢？這里有兩種方法： 

1、設(shè)置你的服務(wù)器的iis，給doc等后綴名做映射。

2、在向客戶端發(fā)送時設(shè)置其contenttype。 

下面詳細(xì)說明方法2 

程序代碼: 

<% Response.Buffer = true Response.Clear dim url Dim fso,fl,flsize dim Dname Dim objStream,ContentType,flName,isre,url1 '*********************************************調(diào)用時傳入的下載文件名 Dname=trim(request("n")) '****************************************************************** If Dname<>"" Then '******************************下載文件存放的服務(wù)端目錄  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 %>

將下面的東西存成download.asp然后你就可以用<a herf="http://xxx.xxx.com/download.asp？n=file.doc">download!</a>來下載同一目錄下的file.doc了!  

但是這里有個問題就是直接將file.doc路徑寫在url里是不安全的，所以解決方案應(yīng)該是將file.doc的路徑存到數(shù)據(jù)庫里，同過查找數(shù)據(jù)庫后得到路徑 

在這個程序的最前面如果加上一個判斷： 

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

就能夠很好的防止別人的盜鏈了.