利用adodb.stream直接下载任何后缀的文件
<P>在_blank>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_blank>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" target=_blank>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</P>
<P>下面详细说明方法2</P>
<P><%
Response.Buffer = true
Response.Clear</P>
<P>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</P>
<P>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</P>
<P>
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</P>
<P> Response.AddHeader "Content-Disposition", "attachment; filename=" & flName
Response.AddHeader "Content-Length", flsize</P>
<P> Response.Charset = "UTF-8"
Response.ContentType = ContentType</P>
<P> Response.BinaryWrite objStream.Read
Response.Flush
response.Clear()
objStream.Close
Set objStream = Nothing</P>
<P>%></P>
<P>将下面的东西存成download.asp然后你就可以用<a herf="download!http://www.knowsky.com/download.asp?n=file.doc">download!</a>来下载同一目录下的file.doc了!</P>
<P>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" target=_blank>数据库里，同过查找数据库" target=_blank>数据库后得到路径</P>
<P>在这个程序的最前面如果加上一个判断：</P>
<P>if instr(Request.ServerVariables("HTTP_REFERER"),"http://你的_blank>域名")=0 then
Response.End
end if</P>
<P>就能够很好的防止别人的盗链了</P>
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