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
1
2Response.Buffer = true
3Response.Clear
4
5dim url
6Dim fso,fl,flsize
7dim Dname
8Dim objStream,ContentType,flName,isre,url1
9'*********************************************调用时传入的下载文件名
10Dname=trim(request("n"))
11'******************************************************************
12If Dname<>"" Then
13'******************************下载文件存放的服务端目录
14url=server.MapPath("/")&"\"&Dname
15'***************************************************
16End If
17
18Set fso=Server.CreateObject("Scripting.FileSystemObject")
19Set fl=fso.getfile(url)
20flsize=fl.size
21flName=fl.name
22Set fl=Nothing
23Set fso=Nothing
1
2Set objStream = Server.CreateObject("ADODB.Stream")
3objStream.Open
4objStream.Type = 1
5objStream.LoadFromFile url
6
7
8Select Case lcase(Right(flName, 4))
9Case ".asf"
10ContentType = "video/x-ms-asf"
11Case ".avi"
12ContentType = "video/avi"
13Case ".doc"
14ContentType = "application/msword"
15Case ".zip"
16ContentType = "application/zip"
17Case ".xls"
18ContentType = "application/vnd.ms-excel"
19Case ".gif"
20ContentType = "image/gif"
21Case ".jpg", "jpeg"
22ContentType = "image/jpeg"
23Case ".wav"
24ContentType = "audio/wav"
25Case ".mp3"
26ContentType = "audio/mpeg3"
27Case ".mpg", "mpeg"
28ContentType = "video/mpeg"
29Case ".rtf"
30ContentType = "application/rtf"
31Case ".htm", "html"
32ContentType = "text/html"
33Case ".txt"
34ContentType = "text/plain"
35Case Else
36ContentType = "application/octet-stream"
37End Select
38
39Response.AddHeader "Content-Disposition", "attachment; filename=" & flName
40Response.AddHeader "Content-Length", flsize
41
42Response.Charset = "UTF-8"
43Response.ContentType = ContentType
44
45Response.BinaryWrite objStream.Read
46Response.Flush
47response.Clear()
48objStream.Close
49Set objStream = Nothing
将下面的东西存成download.asp然后你就可以用
1<a herf=" http://www.knowsky.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