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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:3 F0 \4 z( u+ W5 l* Q, j
1、设置你的服务器" target=_blank>服务器的iis,给doc等后缀名做映射
: r- D4 t: j/ N" }/ A0 Z8 x- P2、在向客户端发送时设置其contenttype
9 s: p( | A4 t) E# n) O4 } g下面详细说明方法2 : G. L6 K5 H' Z1 a
<%
6 k1 a9 l* X5 @0 d2 Y' J' cResponse.Buffer = true
5 @, }* K+ K2 qResponse.Clear # h* b& t/ X0 H7 D
dim url
1 E1 @* E9 M" n6 f3 _! LDim fso,fl,flsize
/ _; |" B# ~: q. ~7 Zdim Dname" |3 q4 _- ?4 }, O; x G) S; |) S
Dim objStream,ContentType,flName,isre,url1$ S/ c7 U Z3 b( |4 P
'*********************************************调用时传入的下载文件名 O/ ^6 a/ W' Z( H. M. L# S+ h
Dname=trim(request("n"))
' M, @% l1 @5 H" B' A8 Z'******************************************************************8 l2 e5 I: q" T* g6 Y
If Dname<>"" Then
7 j* }9 p/ ]; w! g' K& x+ a'******************************下载文件存放的服务端目录# m' {0 b( C, Q) h
url=server.MapPath("/")&"\"&Dname
. B# s4 [% s7 o! h6 S'***************************************************
! G& Z+ C" N8 AEnd If 0 Z# Q7 y4 J! w: @
Set fso=Server.CreateObject("Scripting.FileSystemObject")
0 m% Q) ?- Z2 m Set fl=fso.getfile(url)
/ F, O1 I' ^6 f. S flsize=fl.size
! }8 @* t; ^/ E$ G0 t1 |: g, [ flName=fl.name
; v# l) R t+ b+ u0 l' K( T Set fl=Nothing1 L0 q5 V r7 R# a' C# C+ `
Set fso=Nothing' t3 t+ m) t$ h4 `% L6 [6 q7 {
%>
* {8 q' \$ V W, W! e4 A- e: q<%6 a& T7 x3 [/ w: J
Set objStream = Server.CreateObject("ADODB.Stream")
. [( X' j7 q% ^5 F6 |/ V objStream.Open; @% ^% q7 B9 e- x* j7 x: }( E! o* ?
objStream.Type = 1
0 T7 E W6 t7 ~8 T, z+ q objStream.LoadFromFile url ?; i' m& B. L. y* K
/ A$ |% K6 R( L" F, y9 z
Select Case lcase(Right(flName, 4))/ \+ v% U5 q5 s! J: a; P/ ^' J3 S
Case ".asf"9 L) G4 k: J4 v. A8 Y4 }
ContentType = "video/x-ms-asf"' w1 e# u- {1 z9 O
Case ".avi"8 w7 _7 Q6 w) l4 n
ContentType = "video/avi"
/ p7 v6 W# O x2 \2 | Case ".doc") E' q, O6 J5 J0 X& x7 E( K
ContentType = "application/msword"
& `& n6 ?7 E& ~/ \! W- s/ e Case ".zip"
1 r1 w4 W4 }2 M ContentType = "application/zip"
+ Z `( s3 I3 T9 D: c* c Case ".xls"$ H7 T3 X, b# x2 g5 I$ F) X
ContentType = "application/vnd.ms-excel"
0 D0 i; g3 J+ l1 P8 q( \% o+ Y Case ".gif"# l* E( h) }' o& U; F0 p) N) [0 W4 E5 k
ContentType = "image/gif"
3 W$ @! u9 C& A% T0 |; N: O Case ".jpg", "jpeg"- {! G( Z* G- i/ Y( m
ContentType = "image/jpeg"
6 u1 i" x7 \' c( F5 v, ~ K8 Y Case ".wav"
# i$ g2 X/ x7 N1 M7 D _- d4 s ContentType = "audio/wav"" i' I3 E" Z' X2 S) o k; w
Case ".mp3", B/ I" {' i# T
ContentType = "audio/mpeg3"8 B/ F: [/ m [) j1 r b
Case ".mpg", "mpeg"1 T, a; x' s ~' n' s0 o( o
ContentType = "video/mpeg"! w/ Q- c. d4 @- e/ q Q8 @
Case ".rtf"
8 y/ Z$ i+ V6 D$ b" U4 |+ ~ ContentType = "application/rtf"
. _4 J6 P& r$ Y& @6 l3 m6 M4 [ Case ".htm", "html"- [/ j/ Q: `7 u& X3 @
ContentType = "text/html"" J5 k% ]3 Z6 T" V' }
Case ".txt"
9 t0 G9 [& r' o2 q# y. w5 B ContentType = "text/plain"
6 [( a% u% e5 J Case Else) ^, I4 B0 A4 o% F/ o- b
ContentType = "application/octet-stream"
* E7 v: v. b7 s/ |: P4 ^8 _8 @$ p End Select
0 ]8 ~# N, z9 T$ u# u" @* c8 I: t4 W6 z! R5 y8 k2 ^+ s
Response.AddHeader "Content-Disposition", "attachment; filename=" & flName% ?/ J. R& G) @% t3 f9 A7 }1 c
Response.AddHeader "Content-Length", flsize
$ l" N0 ?4 X4 L) J( F Response.Charset = "UTF-8" r( O. S9 y0 y1 @; C% w! E- J
Response.ContentType = ContentType : B2 C3 E( g% B9 a% Z" S& _
Response.BinaryWrite objStream.Read8 w9 K+ p6 q4 M3 c( n
Response.Flush
) b, _" z" t: {9 a& W5 X response.Clear()
/ p* E4 K7 e$ {/ P: r# A objStream.Close
1 N: l' V+ E& v7 r Set objStream = Nothing . ]5 x, V9 A9 j
%>
( c8 |" X# w" G5 d) X" M8 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!
, \6 l$ n+ x1 K" @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 1 D3 g4 P+ C( R/ [0 D) o
在这个程序的最前面如果加上一个判断: ' X. i& A5 g$ {* L6 Q4 \) J- e: x1 w
if instr(Request.ServerVariables("HTTP_REFERER"),"http://你的_blank>域名")=0 then
* f2 p: f/ r) [2 Q0 u3 z6 g6 _ Response.End' o* F! f6 }! ] k* n2 Z
end if ) j4 E* O8 h( W" u z r5 }3 s; P
就能够很好的防止别人的盗链了 |