如果我们知道一个静态文件的实际路径如：http://www.xx.com/download/51windows.pdf，如果服务器没有作特别的限制设置，我们就可以毫不费力的把它下载下来！当网站提供51windows.pdf下载时，怎么样才能让下载者无法得到他的实际路径呢！本文就来介绍如何使用Asp来隐藏文件的实际下载路径。
我们在管理网站文件时，可以把扩展名一样的文件放在同一个目录下，起一个比较特别名字，例如放pdf文件目录为the_pdf_file_s，把下面代码另存为down.asp，他的网上路径为http://www.xx.com/down.asp，我们就可以用http://www.xx.com/down.asp?FileName=51windows.pdf来下载这个文件了，而且下载者无法看到这个文件实际下载路径的！在down.asp中我们还可以设置下载文件是否需要登陆，判断下载的来源页是否为外部网站，从而可以做到防止文件被盗链。
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 |
<% 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 %> |
不明白!要怎么样才能找到这个路径呢!?