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[url]http://www.xx.com/down.asp[/url],我们就可以用[url]http://www.xx.com/down.asp?FileName=51windows.pdf[/url]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:
以下是引用片段:
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 = "p_w_picpath/*" '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", "p_w_upload; 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_p_w_picpaths_/"&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
Response.AddHeader "Content-Disposition", "p_w_upload;filename=2.gif"'文件名
Response.ContentType = "p_w_picpath/GIF" ’设置(1)
response.Binarywrite ReadBinaryFile(server.mappath("2.gif"))'就是你读取存在本地的文件,防止被
别人知道真实路径盗连的。
%>
(1)下面的示例将 ContentType 属性设置为其他的常见值。
text/HTML 这个就不说了
p_w_picpath/GIF gif图片
p_w_picpath/JPEG jpg图片
application/x-cdf cdf文档
application/wma 就是西瓜哪个音乐类型了
具体可以参照 Web 浏览器文档或当前的 HTTP 规格说明
这样再利用asp的储存session,cookies,以及读取HTTP头等特殊功能就可以完全真正的实现防盗连,这里
没有设置缓存,如果访问量巨大,我想设置下就会更好吧。
asp下载防盗链代码