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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 K5 x) s* m+ ~+ Z
1、设置你的服务器" target=_blank>服务器的iis,给doc等后缀名做映射7 Y0 p* m' n8 L4 ?6 O- b1 Z
2、在向客户端发送时设置其contenttype
, q1 F! A1 u: }2 B下面详细说明方法2
9 l; {; o$ P! {0 @' k<%- W) m k3 H- a0 \7 X3 Z& \: }* _
Response.Buffer = true4 `) m ?* p/ t# g# Q/ d
Response.Clear ; z! j! c6 k L/ s% J
dim url! H) S- p7 M8 v5 O
Dim fso,fl,flsize
( K* N0 G3 f! {; f% j9 ~0 Ldim Dname% G. [" v% g" C/ v5 q3 M
Dim objStream,ContentType,flName,isre,url1
1 d& B. x* L+ g" z$ K% S'*********************************************调用时传入的下载文件名
3 c/ | w+ A, X0 Q$ Y% F- ZDname=trim(request("n"))
$ d7 B* g' e/ t5 [) @# L'******************************************************************
% S( z% w" F" Z4 WIf Dname<>"" Then K) S( I! v3 Z1 [% N
'******************************下载文件存放的服务端目录
/ s4 {8 H) v1 ~- O9 ? url=server.MapPath("/")&"\"&Dname
/ Y# \7 K* n; H6 C/ `. r, m'***************************************************
5 P- T" l# J( s) {' b X, ZEnd If
% s, c0 F* I* o sSet fso=Server.CreateObject("Scripting.FileSystemObject")4 L) `& T \2 \; ^
Set fl=fso.getfile(url)) B I' I6 K' }" `: Q
flsize=fl.size
! ?# ]. \$ V- x" g9 L. C flName=fl.name
1 X% n4 S$ w3 Z7 d. i9 N- H Set fl=Nothing, y, @ ^& q( G7 X& ~
Set fso=Nothing) g0 _ n( j% \
%>
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Set objStream = Server.CreateObject("ADODB.Stream"): E5 ~& l l8 {" u- d2 g
objStream.Open ]0 F: |( E2 C6 o) j
objStream.Type = 1
% \, Z. v6 }: s- r6 G8 g objStream.LoadFromFile url 0 v9 w1 y/ a! }; |- z6 a
3 r: e( t$ X4 Z @ Select Case lcase(Right(flName, 4))
: [* D. T& x/ `, H! e% y4 a Case ".asf"$ n* A1 ~) [2 y! z* `. X4 x. [- }
ContentType = "video/x-ms-asf"# J& y# e5 j9 x- y5 Y% }3 P
Case ".avi" h% t. E% t* @- d- v$ J o/ K6 i
ContentType = "video/avi"7 m1 o) ?6 F1 ^6 ~: b
Case ".doc"9 T6 B3 T( ^ |; ^* D9 N
ContentType = "application/msword"
0 h( B- F+ j. |9 [' z Case ".zip"
# X0 l5 i: D q# O4 I6 h; H) Z ContentType = "application/zip"0 h; ^. q* ^) D+ u1 J' h# V# U
Case ".xls"
9 ?' E8 Y- V4 L/ H# Y) }9 k C ContentType = "application/vnd.ms-excel"
& d/ }# u$ i6 F" f9 d: i8 q Case ".gif"& u+ n. @' P& e& w5 G# p* I L
ContentType = "image/gif"
6 u# c% }& W; t+ d% v+ A, d9 o Case ".jpg", "jpeg"* Y, Q8 Z& w; ^) T
ContentType = "image/jpeg"
+ L- ]" Z8 f3 D+ m2 s Case ".wav"
7 _& n' c/ I! S: L8 v) \ ContentType = "audio/wav"( {0 t9 J4 k3 M: T$ o
Case ".mp3"1 f) W9 C4 o* I' U/ n+ W) ~
ContentType = "audio/mpeg3"3 C" ^4 K" N9 V$ R
Case ".mpg", "mpeg"
1 C1 J3 p, n' [/ f/ K ContentType = "video/mpeg"
+ |3 o8 W2 u1 M9 z3 z+ Q Case ".rtf"* A$ u1 M& B+ t# z8 W4 a
ContentType = "application/rtf"
! b1 o) U7 ~, t- d8 U( | Case ".htm", "html"# x3 r* d7 d) P- N
ContentType = "text/html"
# E4 T' z. I4 c5 E) j$ M9 I* s i4 T Case ".txt"
! U# O- D; ?3 @6 G5 g ContentType = "text/plain"" s x. G2 ~% Y- k0 }2 w1 G
Case Else
( Y4 B) `( W& D [ ContentType = "application/octet-stream"
; t( j& |" g' ~6 |' ]8 ? End Select + ~0 f) F% W+ {( R( v$ m; D
, E) @9 S. H3 x# p' b Response.AddHeader "Content-Disposition", "attachment; filename=" & flName4 f& E! y" W9 J; t2 K
Response.AddHeader "Content-Length", flsize 3 \8 _5 \8 \3 F2 \' \' \
Response.Charset = "UTF-8"- ^- A. A4 ?# [* U; f' {. \
Response.ContentType = ContentType , r* D( C4 x& I8 B! X8 t
Response.BinaryWrite objStream.Read
2 F6 h3 O; u# [2 Z$ S; g* U4 J Response.Flush
8 n6 W( I! H& t9 ?, J7 ? response.Clear()
" H* u f" u' \3 C/ P objStream.Close- S9 G' O& R0 V, l7 V* g
Set objStream = Nothing
2 \8 r1 k# N) b T$ M5 B! R h%>
* W2 P3 C3 \. Y+ \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! - G" V: d; i+ {& |$ R' s5 b3 Z5 ~3 W
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 0 O* m, X: ^" m" I0 ~) q- O
在这个程序的最前面如果加上一个判断: 3 Z* t: v! W( Y1 u
if instr(Request.ServerVariables("HTTP_REFERER"),"http://你的_blank>域名")=0 then
. {) V. \% d: K) O! A1 Q Response.End A# m$ S$ P" @. F9 l; T v4 H
end if . j; x9 R5 U7 s6 u
就能够很好的防止别人的盗链了 |