用Asp隱藏文件路徑，完成防盜鏈

示例代碼：
<%
From_url = Cstr(Request.ServerVariables("HTTP_REFERER"))
Serv_url = Cstr(Request.ServerVariables("SERVER_NAME"))
if mid(From_url,8,len(Serv_url)) <> Serv_url then
��response.write "非法鏈接！" '防止盜鏈
��response.end
end if
if Request.Cookies("Logined")="" then
��response.redirect "/login.asp" '需要登陸！
end if
Function GetFileName(longname)'/folder1/folder2/file.asp=>file.asp
��while instr(longname,"/")
�，�longname = right(longname,len(longname)-1)
��wend
��GetFileName = longname
End Function

Dim Stream
Dim Contents
Dim FileName
Dim TrueFileName
Dim FileExt
Const adTypeBinary = 1
FileName = Request.QueryString("FileName")
if FileName = "" Then
�，�Response.Write "無(wú)效/webpage/asp/041101/24.htm！"
�，�Response.End
End if

FileExt = Mid(FileName, InStrRev(FileName, ".") + 1)
Select Case UCase(FileExt)
�，�Case "ASP", "ASA", "ASPX", "ASAX", "MDB"
�，，，�Response.Write "非法操作！"
�，，，�Response.End
End Select

Response.Clear

if lcase(right(FileName,3))="gif" or lcase(right(FileName,3))="jpg" or lcase(right(FileName,3))="png" then
��Response.ContentType = "image/*" '對(duì)圖像文件不出現(xiàn)下載對(duì)話框
else
��Response.ContentType = "application/ms-download"
end if

Response.AddHeader "content-disposition", "attachment; 200497141230.htm=" & GetFileName(Request.QueryString("FileName"))
Set Stream = server.CreateObject("ADODB.Stream")
Stream.Type = adTypeBinary
Stream.Open
if lcase(right(FileName,3))="pdf" then '設(shè)置pdf類型文件目錄
��TrueFileName = "/the_pdf_file_s/"&FileName
end if
if lcase(right(FileName,3))="doc" then '設(shè)置DOC類型文件目錄
��TrueFileName = "/my_D_O_C_file/"&FileName
end if
if lcase(right(FileName,3))="gif" or lcase(right(FileName,3))="jpg" or lcase(right(FileName,3))="png" then
��TrueFileName = "/all_images_/"&FileName '設(shè)置圖像文件目錄
end if
Stream.LoadFromFile Server.MapPath(TrueFileName)
While Not Stream.EOS
��Response.BinaryWrite Stream.Read(1024 * 64)
Wend
Stream.Close
Set Stream = Nothing
Response.Flush
Response.End
%>