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。

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 Resp</p><p align='center'><b><font color='red'>[1]</font> <a href='/developer/asp4/200612/20061230022940_15292_2.html'>[2]</a> <a href='/developer/asp4/200612/20061230022940_15292_2.html'>下一页</a> </b></p></td> </tr> </table> </td> </tr> </table> <table class=center_tdbgall cellSpacing=0 cellPadding=0 width=570 border=0 id=table7> <tr> <td align=middle> <script language="javascript" src="/ads/cntuba-ads/dn/y2.js"></script></td> </tr> <tr> <td background=/Skin/sealove/line01.gif height=1></td> </tr> <tr> <td height=2></td> </tr> <tr> <td align=middle> <script language="javascript" src="/ads/cntuba-ads/dn/y3.js"></script></td> </tr> </table> </td> <td width=1 bgColor=#888888></td> <td width=4></td> <td width=1 bgColor=#888888></td> <td vAlign=top width=200> <table cellSpacing=0 cellPadding=0 width="100%" align=center border=0> <tr> <td align=middle> <script language="javascript" src="/ads/cntuba-ads/dn/y5.js"></script></td> </tr> <tr> <td height=5></td> </tr> </table> <table cellSpacing=0 cellPadding=0 width="100%" align=center border=0> <tr> <td align=middle bgColor=#fab571 height=20><FONT color=#ffffff><STRONG>分类推荐</STRONG></FONT></td> </tr> <tr> <td align=middle><table height=216 cellSpacing=0 cellPadding=0 width="100%" align=center border=0> <tr align=middle bgColor=#fcfcf5> <td width=33 rowSpan=2><B><FONT color=#ff0000>社会</FONT></B></td> <td><A href="/News/List/List_17.html">社会</A></td> <td><A href="/News/List/List_18.html">娱乐</A></td> <td><A href="/News/List/List_19.html">军事</A></td> <td><A href="/News/List/List_20.html">校园</A></td> </tr> <tr align=middle bgColor=#fcfcf5> <td><A href="/humor/Index.html">幽默</A></td> <td><A href="/News/List/List_21.html">体育</A></td> <td><A href="/women/List/List_50.html">女性</A></td> <td><A href="/Article/Index.html">专题</A></td> </tr> <tr align=middle bgColor=#eff1f1> <td width=33 rowSpan=2><B><FONT 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<td><A href="/health/List/List_47.html">单身</A></td> <td><A href="/health/List/List_49.html">情感</A></td> <td><A href="/health/List/List_45.html">实录</A></td> </tr> <tr align=middle bgColor=#f3f8fb> <td width=33 rowSpan=2><B><FONT color=#ff0000>视频</FONT></B></td> <td><A href="/movie/List/List_10.html">写真</A></td> <td><A href="/movie/List/List_9.html">搞笑</A></td> <td><A href="/movie/List/List_11.html">MTV</A></td> <td><A href="/movie/List/List_15.html">翻唱</A></td> </tr> <tr align=middle bgColor=#f3f8fb> <td><A href="/movie/List/List_12.html">写实</A></td> <td><A href="/movie/List/List_13.html">片段</A></td> <td><A href="/movie/List/List_14.html">游戏</A></td> <td><A href="/movie/List/List_16.html">综艺</A></td> </tr> </table></td> </tr> <tr> <td height=5></td> </tr> </table> <table cellSpacing=0 cellPadding=0 width="100%" align=center border=0> <tr> <td align=middle bgColor=#82b3ce height=20><FONT color=#ffffff><STRONG>ASP文摘热门文章</STRONG></FONT></td> </tr> <tr> <td> <img 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