asp下载图片代码

用asp实现下载图片,原来的在ie中打入图片,将会在ie浏览器中打开图片,怎么实现下载图片呢？看下面代码
比如下载一个forasp.jpg，把下面文件保存为 index.asp ,并在同级路径下放入forasp.jpg,当下载的时候就是index.asp?FileName=forasp.jpg这样既可。前面的功能还实现了判断是否是盗链，是否需要登录等功能，这根据自己的需要来删除或者添加。

'这里是判断是否是盗链,来源书籍，www.forasp.cn网站制作学习网整理
'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！"
'response.end
'end if
'这www里.for是asp判.cn断是否登录了，如果不登陆则输出登陆
'if Request.Cookies("Logined")="" then
'response.write  "需要登陆！"
'response.end
'end if
Function GetFileName(longname)
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！" 'www.forasp.cn整理，转载请保留
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 = "/download/"&FileName
end if
if lcase(right(FileName,3))="doc" then '设置DOC类型文件目录
TrueFileName = "/download/"&FileName
end if
if lcase(right(FileName,3))="gif" or lcase(right(FileName,3))="jpg" or lcase(right(FileName,3))="png" then
TrueFileName = "/images/"&FileName '设置www.f图or像asp文.c件n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

网站制作学习网整理，www.forasp.cn  转载请注明，鄙视采集。