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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:
* y5 L0 W- H) W1、设置你的服务器" target=_blank>服务器的iis,给doc等后缀名做映射
& u! V. C) e" q4 v2、在向客户端发送时设置其contenttype
# {( y7 |3 i) D下面详细说明方法2 ; o" q/ f9 w" { W
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Response.Buffer = true
! R* y& Y0 Y) ^5 \Response.Clear U6 ^: a0 _' J U7 }, e1 q
dim url: ]0 i+ S9 g% t
Dim fso,fl,flsize) _; P# t- ~2 {5 H9 Y, f
dim Dname
' B; l# c, U1 g P, HDim objStream,ContentType,flName,isre,url1
# h E6 g# q) k$ W. t'*********************************************调用时传入的下载文件名 O+ w' f" P i' }/ l
Dname=trim(request("n"))" |4 D& d" r% b7 f
'******************************************************************
5 }9 X% P9 B- MIf Dname<>"" Then( O+ K. h: D% n& D3 P& k
'******************************下载文件存放的服务端目录, \3 j# d; k8 @- ]& x
url=server.MapPath("/")&"\"&Dname6 V. I& c3 P( @: ]3 I( \
'***************************************************, r! e6 F$ |9 _( |
End If
5 _6 d6 ]) k6 i) m0 B) pSet fso=Server.CreateObject("Scripting.FileSystemObject")
& p! U0 c4 H7 q; W. E Set fl=fso.getfile(url)* s- Q* Y! y& [" a+ z/ i6 j
flsize=fl.size
- \' B1 Z) I; o( T" q flName=fl.name
! {2 S( K% K+ r Set fl=Nothing
8 }" o7 G# ?8 [ F7 |( | Set fso=Nothing
5 ^; P9 m' Y1 C%>6 g- P+ W7 X9 Y4 {
<%
* D2 m. Z9 v& ~* X( ] Set objStream = Server.CreateObject("ADODB.Stream")# B- J2 Y/ h& k! F$ S5 w
objStream.Open
5 a; P8 h; w, @' V' M objStream.Type = 18 {7 |0 L- N0 |
objStream.LoadFromFile url
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Select Case lcase(Right(flName, 4))
6 V' `- V9 y8 a) Y' e T9 m8 @ Case ".asf"
" U5 W( X/ q! v5 a- Z9 @ ContentType = "video/x-ms-asf"5 v; x2 W0 ~) {; n( j7 t
Case ".avi"* k0 m$ ` b( A
ContentType = "video/avi") |# s* F5 C! h
Case ".doc"
X- |+ v" A$ u( ]6 [7 H+ y ContentType = "application/msword"
4 l" e5 U5 F# M Case ".zip"; {, }! P3 Z# v2 N0 U
ContentType = "application/zip"
' O8 M1 @9 U" W Case ".xls"
2 x. L: q+ G1 O3 q( {$ q/ R, { ContentType = "application/vnd.ms-excel"3 {8 z/ b0 c& y% ^0 h% K
Case ".gif") t+ O8 W" E; ~2 J6 p
ContentType = "image/gif"
; Y \$ `( }% A9 B- I' J Case ".jpg", "jpeg". j! j& T9 e5 M7 W" q$ N
ContentType = "image/jpeg"
+ Y( r4 e8 l/ S s4 N$ q9 L Case ".wav"- n+ A% V9 ] Y' b" s0 X6 A
ContentType = "audio/wav"
3 L0 q8 }& a6 n Case ".mp3") m5 k* i5 Y: r- Z
ContentType = "audio/mpeg3"
* y& Z2 F& l w9 r$ V' ?! q3 P# l# @ Case ".mpg", "mpeg"
$ h; S+ p" G. _4 g+ v; t ContentType = "video/mpeg"
( J" v, L& p$ A; U8 u" l M2 [3 } Case ".rtf"2 p8 a8 P+ ]& q9 U5 Y
ContentType = "application/rtf"% `* n+ ~# {$ l; F, D- Q& `$ _
Case ".htm", "html"
& u7 V/ p+ Z! m9 @& u H ContentType = "text/html"1 }, N. Z8 z" w. [5 T. K" I6 [) W, I
Case ".txt"; d' \1 `2 }; C1 {# S ~
ContentType = "text/plain"4 H5 y; P$ m& Z, _# s1 x
Case Else' t6 W' o, l% b i Y$ c
ContentType = "application/octet-stream"6 k) R6 ~5 ]- X8 J
End Select 0 ~2 C. s0 M& X( a P
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Response.AddHeader "Content-Disposition", "attachment; filename=" & flName) f p, V, n- u
Response.AddHeader "Content-Length", flsize * E' A: r3 R8 d5 U
Response.Charset = "UTF-8"2 J% s3 L0 i: {# l- ]
Response.ContentType = ContentType + i* P# O6 s% x$ I- y2 G
Response.BinaryWrite objStream.Read
/ P; H5 ~* d+ @0 c* {5 U. v Response.Flush
4 f/ z* ]' Y- V$ t response.Clear()3 l$ _4 V6 C+ G4 F' e. ^7 t% Q
objStream.Close( c6 K1 g* P% S1 P& |# y0 s- f0 C
Set objStream = Nothing
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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/ E# |& V0 M' g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 $ a6 L: x# M8 S" b8 p% s
在这个程序的最前面如果加上一个判断: . R1 `3 w$ X$ G. G! D
if instr(Request.ServerVariables("HTTP_REFERER"),"http://你的_blank>域名")=0 then6 e& t4 ~! j0 w/ |6 ~0 Y8 ?
Response.End
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就能够很好的防止别人的盗链了 |