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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:6 q) O$ |, ~% j& K7 _; D
1、设置你的服务器" target=_blank>服务器的iis,给doc等后缀名做映射+ i; W6 f& I! [( U# [( {
2、在向客户端发送时设置其contenttype 5 a4 M- h" k7 X, c% ~9 U1 z2 W
下面详细说明方法2
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Response.Buffer = true; w. y, Q2 m C" n; e+ ?! R
Response.Clear ( r& m3 _% F- l8 X, g
dim url
; N- F1 P9 V. g7 |* ]0 T" c7 eDim fso,fl,flsize
% W% k! n4 @! l6 U2 n% }, Y, _dim Dname
7 x$ c3 L7 y# m' M9 YDim objStream,ContentType,flName,isre,url1' Z- E) A4 f8 }, t
'*********************************************调用时传入的下载文件名6 H5 Z/ @, Y. Z7 l
Dname=trim(request("n"))
& s( n$ A3 s4 M'******************************************************************9 c! {# f- {6 L5 S9 m u0 z
If Dname<>"" Then
3 D: q I2 K6 Q'******************************下载文件存放的服务端目录7 |) y, S+ R5 g& C! i
url=server.MapPath("/")&"\"&Dname: ]- J S z- x6 n
'***************************************************
6 F1 n |0 u! p5 ~0 b+ ^8 q6 GEnd If , y5 U( O# f6 u; a/ ]" Y) l, ^
Set fso=Server.CreateObject("Scripting.FileSystemObject")
' |& P5 r0 s# }& w5 n z Set fl=fso.getfile(url)
7 E0 {% O3 P' s" j4 W flsize=fl.size
8 J8 o; w ~4 Q( E5 a flName=fl.name
" S) X8 H4 ]0 l ]& E: u7 A3 V Set fl=Nothing
8 ?2 e! r4 S/ P, }1 \0 g Set fso=Nothing$ l, x. H5 Q! R g) d
%>
, _1 {6 v" ]; K# q- t1 H<%
# \5 W y. J5 w& z; u5 b Set objStream = Server.CreateObject("ADODB.Stream")
* E# y% b& u' s$ r3 ]6 U: |) y9 I objStream.Open
0 q6 _# C* y. i0 K( o" H+ l objStream.Type = 1( ? E0 ~' j( t* e2 Q' {
objStream.LoadFromFile url
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Select Case lcase(Right(flName, 4)); c R+ G0 Y- d6 p( O
Case ".asf"
7 {+ i1 |, T9 H/ r ContentType = "video/x-ms-asf"* O. [* q8 u- p" W0 w& _' R: v
Case ".avi"/ ~9 R5 D! u+ C# F
ContentType = "video/avi"$ C+ t3 E. ^6 L% Z. o
Case ".doc"' e3 x0 a& k& ]) I4 P4 V. y
ContentType = "application/msword"3 d9 }$ U5 S$ z r
Case ".zip"& I" u5 c1 ?. Q- E* K( a+ {% Y
ContentType = "application/zip"+ I9 s; t: ~& z, M
Case ".xls"9 [# N8 K0 _! d
ContentType = "application/vnd.ms-excel"
) r/ G3 p0 p" |% N$ D% j8 x' O7 P Case ".gif"
: {- z$ j$ u f5 Y" s ContentType = "image/gif"
7 h$ A4 }6 T9 G3 B& u Case ".jpg", "jpeg": d4 Y+ \2 Z" o3 m( X6 Q" N/ T: d7 ?
ContentType = "image/jpeg"9 k$ B4 M- O2 B! ~8 o
Case ".wav"
$ d. s2 e* u" \' @ ContentType = "audio/wav"" W6 s! _& w7 ~5 Y; `# S: Z
Case ".mp3"8 s+ R) V* f9 |( g- {8 d9 p/ ~+ W
ContentType = "audio/mpeg3"
$ O" O, V# A" O4 h) l Case ".mpg", "mpeg"6 f5 K' @3 b3 n
ContentType = "video/mpeg"
3 s; |' s+ C5 S6 l/ e1 @. q Case ".rtf"
) {4 H3 v* S; P9 e* `8 x5 } ContentType = "application/rtf"
! z, {( M! c/ c Case ".htm", "html"
' z$ _7 |+ b$ }/ R/ e+ ^% y) J: n/ B ContentType = "text/html"
) U6 q7 u0 v( T' o/ b& |6 V# h Case ".txt"! F* L3 j, j1 i/ r; A; f
ContentType = "text/plain"3 ^( C4 [0 w- r, O4 d6 t+ q
Case Else* [ N* h$ @9 T+ P
ContentType = "application/octet-stream"% T; _0 t) e* F0 }* F; _0 c
End Select 3 K, B% t. h4 R$ `
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Response.AddHeader "Content-Disposition", "attachment; filename=" & flName
8 v* U. m& u! ]$ G: v! ? Response.AddHeader "Content-Length", flsize
$ } G2 J! j0 W Response.Charset = "UTF-8"
/ w; q$ \' Z8 E. a4 e- z2 B: F9 d Response.ContentType = ContentType
" f0 T1 Q9 ]. U Response.BinaryWrite objStream.Read4 d& Q: \' J9 _
Response.Flush6 t3 f. _: ^/ A3 I
response.Clear()
6 n0 ?( Q# y0 D% W objStream.Close3 k) ^, _6 Z* Z8 j
Set objStream = Nothing
2 e" n" w( g& r: m# t: f%>
9 B- } _+ o1 J3 I, ~9 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! + Y# [8 P! p S1 J/ T, N
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
5 m4 R7 x! L& t2 M( _- y0 q在这个程序的最前面如果加上一个判断: 7 L3 Z0 L5 c' [' c! `8 S
if instr(Request.ServerVariables("HTTP_REFERER"),"http://你的_blank>域名")=0 then
3 H9 X4 K0 P7 E3 L Response.End
' @. e. [4 ~, n8 @. a" Eend if 9 C+ O2 B' @1 V& e% N
就能够很好的防止别人的盗链了 |