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 p1 R) r; M Y5 A1 r6 l0 r 1、设置你的服务器" target=_blank>服务器的iis,给doc等后缀名做映射9 x+ G' b& M+ S 2、在向客户端发送时设置其contenttype
下面详细说明方法2
<%0 G) b0 a3 {; b& i; O Response.Buffer = true Response.Clear
dim url Dim fso,fl,flsize5 V$ O: r, a- y9 c- O/ B Z; \/ f dim Dname Dim objStream,ContentType,flName,isre,url1 '*********************************************调用时传入的下载文件名; f; E% r# X; n9 |" s9 M7 k Dname=trim(request("n"))* ]' w' M) Z8 e8 Z, ~& |7 Y. q '******************************************************************% i3 K# J- ?' o- @+ Y+ F; l If Dname<>"" Then '******************************下载文件存放的服务端目录 url=server.MapPath("/")&"\"&Dname '**************************************************** o. Z0 i& J- ]1 ~ End If
, [; y! J- T$ V* @! ~Set fso=Server.CreateObject("Scripting.FileSystemObject") Set fl=fso.getfile(url): V# ?1 P) ~, E! S8 B flsize=fl.size2 ]$ R0 g% T/ Q1 s+ E: z8 f flName=fl.name Set fl=Nothing$ F& e* y6 x' h( } I Set fso=Nothing) T" u4 t; H- x+ g %> <% Set objStream = Server.CreateObject("ADODB.Stream") objStream.Open( l3 t; J3 \( L objStream.Type = 1 objStream.LoadFromFile url
# ^" U# @2 E4 J" s$ OSelect Case lcase(Right(flName, 4)) Case ".asf" ContentType = "video/x-ms-asf" Case ".avi" ContentType = "video/avi"* i# k' I( S+ y$ S: {7 t# b. t4 } Case ".doc"& b" r$ {. }! J. @2 f& k ContentType = "application/msword" Case ".zip"0 b2 [" q, d7 m/ v2 y ContentType = "application/zip") r' ^# X9 J" d N: q* I Case ".xls"0 [8 }9 [3 |7 ~! r/ T0 h ContentType = "application/vnd.ms-excel"; d" `; ^, c! O7 K% k, N: p9 C Case ".gif"$ A& X9 l/ O/ x7 n ContentType = "image/gif"; q7 _2 M1 D9 s: C% ^/ O2 @4 `6 a- x, L3 ? Case ".jpg", "jpeg"+ S& L- S1 U. O4 v/ p! |3 J( x# g ContentType = "image/jpeg" Case ".wav"3 R/ A6 s% _, D ContentType = "audio/wav" z {4 d+ u3 q1 G, K+ u Case ".mp3" ContentType = "audio/mpeg3"0 }) P' k: l8 R- n) @- C Case ".mpg", "mpeg"4 j5 j4 R9 c3 M, y2 F6 h; q ContentType = "video/mpeg" Case ".rtf"' g7 u6 n$ c- R/ C. C) w9 ]9 N2 t ContentType = "application/rtf"& M1 q V, B" K5 Q Case ".htm", "html"% m( E- z5 U2 f3 q* _ ContentType = "text/html" Case ".txt"" Q g5 r& {1 [: a# s/ x5 o ContentType = "text/plain" Case Else, f6 F) r, b* S, M. |' _ ContentType = "application/octet-stream" End Select
8 W# L3 ~+ y. Z& A! S + ?' Y2 S4 X9 l- Z. h& rResponse.AddHeader "Content-Disposition", "attachment; filename=" & flName" F+ v: M, M1 ~& x/ Z. V: V1 \ Response.AddHeader "Content-Length", flsize
, G4 v+ ~6 I" N" }* QResponse.Charset = "UTF-8" Response.ContentType = ContentType
; [$ N7 H& r4 d4 ?( I) mResponse.BinaryWrite objStream.Read Response.Flush response.Clear() objStream.Close/ u @2 h, R1 B Set objStream = Nothing
. P9 q6 N- H0 b; k, r# |$ c1 A%>
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!
, @) X4 a, j0 U; P, S9 L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
在这个程序的最前面如果加上一个判断:
if instr(Request.ServerVariables("HTTP_REFERER"),"http://你的_blank>域名")=0 then Response.End/ r8 W* d' d, w$ v z7 r; V end if
, S/ E7 U6 W) h4 G就能够很好的防止别人的盗链了
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