ASP网络篇:4.2 用ASP编写下载网页中所有资源的程序

　　看过一篇关于下载网页中图片的文章，它只能下载以http头的图片，我做了些改进，可以下载网页中的所有连接资源，并按照网页中的目录结构建立本地目录，存放资源。

　　download.asp?url=你要下载的网页

　　download.asp代码如下：

<%
Server.ScriptTimeout=9999
function SaveToFile(from,tofile)
on error resume next
dim geturl,objStream,imgs
geturl=trim(from)
Mybyval=getHTTPstr(geturl)
Set objStream = Server.CreateObject("ADODB.Stream")
objStream.Type =1
objStream.Open
objstream.write Mybyval
objstream.SaveToFile tofile,2
objstream.Close()
set objstream=nothing
if err.number<>0 then err.Clear
end function

function geturlencodel(byval url)’中文文件名转换
Dim i,code
geturlencodel=""
if trim(Url)="" then exit function
for i=1 to len(Url)
code=Asc(mid(Url,i,1))
if code<0 Then code = code + 65536
If code>255 Then
geturlencodel=geturlencodel&"%"&Left(Hex(Code),2)&"%"&Right(Hex(Code),2)
else
geturlencodel=geturlencodel&mid(Url,i,1)
end if
next
end function
function getHTTPPage(url)
on error resume next
dim http
set http=Server.createobject("Msxml2.XMLHTTP")
Http.open "GET",url,false
Http.send()
if Http.readystate<>4 then exit function
getHTTPPage=bytes2BSTR(Http.responseBody)
set http=nothing
if err.number<>0 then err.Clear
end function

Function bytes2BSTR(vIn)
dim strReturn
dim i,ThisCharCode,NextCharCode
strReturn = ""
For i = 1 To LenB(vIn)
ThisCharCode = AscB(MidB(vIn,i,1))
If ThisCharCode < &H80 Then
strReturn = strReturn & Chr(ThisCharCode)
Else
NextCharCode = AscB(MidB(vIn,i+1,1))
strReturn = strReturn & Chr(CLng(ThisCharCode) * &H100 + CInt(NextCharCode))
i = i + 1
End If
Next
bytes2BSTR = strReturn
End Function

function getFileName(byval filename)
if instr(filename,"/")>0 then
fileExt_a=split(filename,"/")
getFileName=lcase(fileExt_a(ubound(fileExt_a)))
if instr(getFileName,"?")>0 then
getFileName=left(getFileName,instr(getFileName,"?")-1)
end if
else
getFileName=filename
end if
end function

function getHTTPstr(url)
on error resume next
dim http
set http=server.createobject("MSXML2.XMLHTTP")
Http.open "GET",url,false
Http.send()
if Http.readystate<>4 then exit function
getHTTPstr=Http.responseBody
set http=nothing
if err.number<>0 then err.Clear
end function