用Asp隐藏文件路径,实现防盗链

示例代码：

<%

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/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/* '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; 200497141230.htm= & 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

%>