以下是引用片段：
<%
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 "非法链接！" '防止盗链
response.end
end if
if Request.Cookies("Logined")="" then
response.redirect "/login.asp" '需要登陆！
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 "无效文件名！"
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/*" '对图像文件不出现下载对话框
else
Response.ContentType = "application/ms-download"
end if
Response.AddHeader "content-disposition", "attachment; filename=" & GetFileName(Request.QueryString("FileName"))
Set Stream = server.CreateObject("ADODB.Stream")
Stream.Type = adTypeBinary
Stream.Open
if lcase(right(FileName,3))="pdf" then '设置pdf类型文件目录
TrueFileName = "/the_pdf_file_s/"&FileName
end if
if lcase(right(FileName,3))="doc" then '设置DOC类型文件目录
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 '设置图像文件目录
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
%>
本地图片，音乐等ASP防盗链代码(asp)
以下是引用片段：
以下是引用片段：
<%
'定义函数，用ADODB.Stream读取二进制数据
Function ReadBinaryFile(FileName)
Const adTypeBinary = 1
Dim BinaryStream
Set BinaryStream = CreateObject("ADODB.Stream")
BinaryStream.Type = adTypeBinary
BinaryStream.Open
BinaryStream.LoadFromFile FileName
ReadBinaryFile = BinaryStream.Read
End Function
以下是引用片段：
以下是引用片段：
<html>
<head><title>最简单的用asp防盗链</title></head>
<body>
<%
Option.Explicit
Response.Buffer=Ture
%>
<%
CheckUrl(http://www.gc888.cn)
%>
<%
Function CheckUrl(url)
Dim Where:Where=Request.SeverVariables("HTTP_REFERER")
If Where=url Then
Call main()
Else
Response.write("很抱歉，您必须从"&url&"访问才能进来！")
End if
End Function
%>
<%
Sub main()
Response.write("这儿是你要显示的网页内容")
End sub
%>
</body>
</html>
还有一种方法就是用判断服务器及上一页的地址来完成。
以下是引用片段：
以下是引用片段：
<%
dim from, local
from = request.ServerVariables("HTTP_REFERER")
local = request.ServerVariables("SERVER_NAME")
If mid(from, 8, local)<>Len(local) Then
response.write "不要从外部提交数据"
else
call main()
end if
sub main()
’你的主体内容
end sub
%>
ASP防止盗链或防止下载的方法 
