ASP防止盗链的一段代码

<%@Language="vbscript"%>
<%
Response.Buffer = true
Response.Expires = -1441

' variables
dim ref : ref=Request.ServerVariables("HTTP_REFERER")
dim arrReferer : arrReferer = split(ref, "/")
dim imgName, strDomain, strDirectory, strImage, strAntiLeech

' assign variables
strDomain = "http://www.xxxx.net"
strDirectory = "/"

' assign variables
strAntiLeech = "anti-leech.jpg"
strImage = request.querystring("img")

if ref > "" then
ref = arrReferer(2) 
end if

if request.querystring("img") <> "" then

if ref = "localhost" or ref = strDomain or ref = "www." & strDomain then
imgname = strDirectory & strImage
else
imgName = strDirectory & strAntiLeech
end if

else

imgName = strDirectory & strAntiLeech

end if

dim objStream
set objStream = server.CreateObject("ADODB.Stream")
objStream.Type = 1
objStream.Open()
objStream.loadFromFile(Server.MapPath(imgName))

Response.ContentType = "image/gif"
Response.BinaryWrite(objStream.Read())

objStream.close()
set objstream = nothing

%>上面代码保存为a.asp
<img src="a.asp" border="0" />