asp.net教程之ASP实现文件直接下载

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asp.net教程之ASP实现文件直接下载

在IE进行文档链接时,如果遇到OLE支持的文档,IE会自动调用相应程序打开它,有时候这种功能并不是我们所需的,虽然我们可以提醒用户用鼠标右键-->"目标另存为...."命令来下载文档,但这样毕竟不太友好,本文描述了利用FSO及Stream方法实现IE直接下载文档.

<%@ language=vbscript codepage=65001%>

<%
''Filename must be input
if Request("Filename")="" then
response.write "<h1>Error:</h1>Filename is empty!<p>"
else
call  downloadFile(replace(replace(Request("Filename"),"\",""),"/",""))

Function  downloadFile(strFile)
''  make  sure  you  are  on  the  latest  MDAC  version  for  this  to  work
''  get  full  path  of  specified  file
strFilename  =  server.MapPath(strFile)

''  clear  the  buffer
Response.Buffer  =  True
Response.Clear

''  create  stream
Set  s  =  Server.CreateObject("ADODB.Stream")
s.Open

''  Set  as  binary
s.Type  =  1

''  load  in  the  file
on  error  resume  next

''  check  the  file  exists
Set  fso  =  Server.CreateObject("Scripting.FileSystemObject")
if  not  fso.FileExists(strFilename)  then
Response.Write("<h1>Error:</h1>"&strFilename&" does not exists!<p>")
Response.End
end  if

''  get  length  of  file
Set  f  =  fso.GetFile(strFilename)
intFilelength  =  f.size

s.LoadFromFile(strFilename)
if  err  then
Response.Write("<h1>Error: </h1>Unknown Error!<p>")
Response.End
end  if

''  send  the  headers  to  the  users  Browse
Response.AddHeader  "Content-Disposition","attachment;  filename="&f.name
Response.AddHeader  "Content-Length",intFilelength
Response.CharSet  =  "UTF-8"
Response.ContentType  =  "application/octet-stream"

''  output  the  file  to  the  browser
Response.BinaryWrite  s.Read
Response.Flush

''  tidy  up
s.Close
Set  s  =  Nothing

End  Function
end if
%>

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