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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:; `5 n7 z y2 x+ K1 H# d; a2 K
1、设置你的服务器" target=_blank>服务器的iis,给doc等后缀名做映射& [; l# G: D- z* J( I! Q) r/ ?! q
2、在向客户端发送时设置其contenttype 6 D) Q& o* ~. Z& J
下面详细说明方法2
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Response.Buffer = true+ I2 Q4 }& O9 H; q. |
Response.Clear
3 H3 y& ~' ^8 F# g+ `dim url1 e9 j. X$ L0 ^1 ~4 V' Z
Dim fso,fl,flsize* a9 B* W: B2 A7 I
dim Dname
( o% I; F# w. N/ NDim objStream,ContentType,flName,isre,url16 i/ a) C* p3 \- p9 {6 a
'*********************************************调用时传入的下载文件名+ v3 W0 i/ r/ t3 u
Dname=trim(request("n"))% @- F4 c3 B4 j" F& J \4 }5 n0 M
'******************************************************************
" c- E% g5 l7 \, |4 oIf Dname<>"" Then
& ? ]+ o( b/ K* ?# ?9 l1 B" c! b'******************************下载文件存放的服务端目录
1 y P8 y- G+ o0 o url=server.MapPath("/")&"\"&Dname
( W; p, i8 D5 t6 A I$ ?1 X. k'***************************************************
6 O- @, i! @7 y6 m% oEnd If
1 e, @8 W- p2 I. xSet fso=Server.CreateObject("Scripting.FileSystemObject")
) }! p( |6 \4 h( F# |! Y( Z Set fl=fso.getfile(url)! @; l; g' b6 }2 q/ ? s
flsize=fl.size
6 l: ?7 P+ W, J+ B flName=fl.name0 N: a7 v6 T: r; `* |" X/ L$ l
Set fl=Nothing
3 z' Y# Z3 g; U9 [$ t- G Set fso=Nothing
' [- r+ q" B4 u" K; F4 |: _- _%>
, [( S6 m2 U. A/ j<%
2 ^- ?6 g- ~# F! c; M Set objStream = Server.CreateObject("ADODB.Stream")
+ J8 H( t) V+ | {, c: C$ f) ? objStream.Open
: Y4 l/ c3 a! E7 z5 V- `7 Z, S: i objStream.Type = 1
; g* p2 h9 [( Z% p objStream.LoadFromFile url
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Select Case lcase(Right(flName, 4))
( x T+ r& q2 T: d; \ Case ".asf"
- H* [ e9 |4 p( z2 z0 f ContentType = "video/x-ms-asf"
0 ^7 t" r* p8 E- v Case ".avi"
% Y1 W: O- _& N n7 D% e0 m( k ContentType = "video/avi"
1 i0 j* a' K4 X( |1 u. z! `/ F1 ` Case ".doc"9 |$ G, o1 v, l3 V
ContentType = "application/msword"5 P! `4 o; {; d) [/ ]+ t2 q
Case ".zip", X3 `0 D! H5 m- B
ContentType = "application/zip" ~9 c7 a( Q I8 }5 I
Case ".xls"
. M! V3 m8 [. \# _ ContentType = "application/vnd.ms-excel"" H! o, q8 O5 A$ A( J: T1 q
Case ".gif"
- f) N ]( e1 `# @; i/ m: g1 Z ContentType = "image/gif", A8 K. k$ |4 y- T, i4 L
Case ".jpg", "jpeg"
$ s( h( E" b [ ContentType = "image/jpeg"9 B1 `6 q9 y6 C
Case ".wav"/ N& m7 u- ~9 R
ContentType = "audio/wav"- e1 l+ o% { o! a4 w- I
Case ".mp3"- ?& C7 n) f+ z1 k# W+ G% P, l* E, j: @6 l
ContentType = "audio/mpeg3"! Q z# G6 {! j8 f8 w- p
Case ".mpg", "mpeg"/ s6 C& j6 x( O' n& [# g1 c6 d
ContentType = "video/mpeg"5 {% G9 B5 A5 K$ f, @2 W8 K
Case ".rtf" z. x3 A5 C# z, k' w
ContentType = "application/rtf"8 L% K5 Y$ q# ]& k r8 l. R
Case ".htm", "html"2 [: C s3 o4 t: L8 B' t' ?
ContentType = "text/html"
4 J5 e5 y. I# P" a! C3 |7 J Case ".txt"( A* ~# o9 e: L
ContentType = "text/plain"
5 R7 }0 h6 Z" N p Case Else
1 Q; k) o! ~& }! s, j; O( | ContentType = "application/octet-stream"
3 q9 t" R f3 U n# g End Select 5 p) D5 @0 M: Y/ l a* ]. [
* l3 Y; i, D8 {: E r Response.AddHeader "Content-Disposition", "attachment; filename=" & flName
; r8 I- }! C" k, O9 @$ J) ? Response.AddHeader "Content-Length", flsize
1 m: n% P. I3 ^5 p2 ? Response.Charset = "UTF-8"& D: F4 r' Y3 L, B
Response.ContentType = ContentType ' s0 h8 J" Y7 a$ y/ s- O
Response.BinaryWrite objStream.Read
@ k' ~1 F! T; }$ P Response.Flush' Z& G) C( ]3 }7 I6 G
response.Clear()
* T! H2 ^% J2 l/ F4 P9 p3 u objStream.Close
. x, ~$ _3 \/ i; d A# l+ K Set objStream = Nothing
. M G! Q1 n% V" H4 t \%>
& Y; d5 w% q* G6 {9 [$ {7 B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!
: T* F. D3 W: D7 X4 |4 E. Z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
7 L0 q' V/ o" i9 p在这个程序的最前面如果加上一个判断:
2 U9 N/ M" Y9 E7 C3 G# Hif instr(Request.ServerVariables("HTTP_REFERER"),"http://你的_blank>域名")=0 then
: W1 P8 W' E: D7 X. r Response.End& \8 t5 _; N3 e% @
end if 7 f& G8 b) S( B
就能够很好的防止别人的盗链了 |