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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:& ^! N; i6 d. W3 a1 T
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' a9 \3 h2 U2、在向客户端发送时设置其contenttype
4 k1 |! {* Q% ]$ ]下面详细说明方法2
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Response.Buffer = true
+ K2 \: G: W0 `( bResponse.Clear
B$ ^$ w0 N! x& Ldim url
5 \5 c C& C7 ^. H$ bDim fso,fl,flsize! I6 x2 r& Y3 }6 b9 p- p: c4 `' V
dim Dname; H6 X! U# u. V2 [5 Y
Dim objStream,ContentType,flName,isre,url18 ^5 q& A) v; k; Y
'*********************************************调用时传入的下载文件名
* E( L, n# Y9 w2 E5 @6 ]# M8 jDname=trim(request("n"))
* p2 M' W: F3 I7 b: d'******************************************************************
/ g q) K) J6 t7 XIf Dname<>"" Then
8 I) L, {; P e; L! O'******************************下载文件存放的服务端目录% {' |% i; W/ A/ I8 A3 c
url=server.MapPath("/")&"\"&Dname3 W0 b5 ^4 `+ A. y% q9 V H3 x; [
'***************************************************! e5 W: y# j( D; a/ c
End If ) P( U( S* {! E1 `1 c8 {
Set fso=Server.CreateObject("Scripting.FileSystemObject")
$ ]9 X, t. X: x1 t Set fl=fso.getfile(url)( T, ?4 B# A/ o# F
flsize=fl.size
. r ~2 V6 O' q, ]" `. U flName=fl.name
$ H/ |% C4 J# l& J9 c Set fl=Nothing$ y# `/ h6 l: B6 z3 ^
Set fso=Nothing$ n/ D) G$ |) g# @% P6 ?& Q
%>+ C' X. `! ~3 w. b0 [
<%- ^; O: ?* e& V
Set objStream = Server.CreateObject("ADODB.Stream")
6 W* s5 _' ?5 T1 W N objStream.Open
$ o# R4 o" x/ p) Q" M% t3 S, p objStream.Type = 1$ T! k3 P" N: _% U4 C2 X
objStream.LoadFromFile url
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Select Case lcase(Right(flName, 4))
% I0 S/ U. f }7 s+ ~ s. H Case ".asf"
. g5 m5 y2 R" P& m& {& Z ContentType = "video/x-ms-asf"
1 D- W% R4 l$ Z. Y Case ".avi"
+ @; g3 i8 _" I0 {1 \: ^" Z ContentType = "video/avi"6 h H- _. M1 W+ R7 {+ p) y
Case ".doc"
D, ^! {! r1 R" A ContentType = "application/msword"
1 H+ Y! `. z! L, t- s& J7 J Case ".zip"
/ f( W1 z. A6 v: I) ^8 ~ ContentType = "application/zip"
3 o! T8 _2 l: }$ U) z Case ".xls"* C1 ^1 t7 u) ?3 ~4 H" G) E3 J" M
ContentType = "application/vnd.ms-excel"6 @7 ~# I Q) P- X
Case ".gif"* w3 p) e: m) x& ~) i$ {
ContentType = "image/gif"
) l8 |7 @9 A# ^. Q# Y Case ".jpg", "jpeg"# N2 R2 c& B/ G3 b
ContentType = "image/jpeg"7 E$ j# ^/ z# ~2 d2 ]6 E
Case ".wav"
: U. t. L, j8 [: E ContentType = "audio/wav"
- ^, y! ~" m6 i! J; d Case ".mp3"7 s% ~. a |% w
ContentType = "audio/mpeg3"+ u6 M2 M' e3 D# n9 ~
Case ".mpg", "mpeg"- _# @0 M+ u" I- \3 L) _1 K3 r
ContentType = "video/mpeg"
9 u8 |7 o% Q& ?& m Case ".rtf"8 R: `" ^( g$ _' v" i8 r* F9 [1 T! b8 \$ E
ContentType = "application/rtf"
5 o2 q; w( h1 p2 L, A- w/ P+ w& b Case ".htm", "html"
! V* Y! \' ?4 F ContentType = "text/html"/ I+ `! n, m4 t6 Q" e' G
Case ".txt"5 d% C' m& R! V# X5 z
ContentType = "text/plain"
o* {1 o3 {/ N5 F9 |* b& P7 E Case Else
3 p0 Q9 Y4 f% H+ C$ R2 F0 @ ContentType = "application/octet-stream", }3 k' e6 [' O6 i6 D/ D T
End Select
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0 q d$ w% I! S p" M" V Response.AddHeader "Content-Disposition", "attachment; filename=" & flName
5 Y" l9 N X: v* P* z2 I2 F Response.AddHeader "Content-Length", flsize
3 n; m: k9 B9 Q3 B( {& `0 N Response.Charset = "UTF-8"8 s3 q: x' l/ G' R$ d5 {, u7 }
Response.ContentType = ContentType : m) z- ~! b" v9 {, Q
Response.BinaryWrite objStream.Read3 _+ b4 {) o+ l
Response.Flush
# c# i" V: R3 h/ u; e! H5 S response.Clear(); O' k/ Y. e; S& s& a& |) C
objStream.Close
$ A2 n" r8 l& Z+ ] g Set objStream = Nothing
" H4 j2 M& h5 f( e/ v8 o%>
" o3 M! ^( J* d4 R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!
# i( L& m$ N5 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
; h' N$ d! }8 {: B2 l在这个程序的最前面如果加上一个判断:
' z* _( A6 ?' `* a% Pif instr(Request.ServerVariables("HTTP_REFERER"),"http://你的_blank>域名")=0 then5 {# r- H5 D4 s- g+ d( N$ m
Response.End
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就能够很好的防止别人的盗链了 |