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

Function CreateDIR(ByVal LocalPath) '建立目录的程序，如果有多级目录，则一级一级的创建
　On Error Resume Next
　LocalPath = Replace(LocalPath, "\", "/")
　Set FileObject = server.CreateObject("Scripting.FileSystemObject")
　patharr = Split(LocalPath, "/")
　path_level = UBound(patharr)
　For I = 0 To path_level
　　If I = 0 Then pathtmp = patharr(0) & "/" Else pathtmp = pathtmp & patharr(I) & "/"
　　　cpath = Left(pathtmp, Len(pathtmp) - 1)
　　If Not FileObject.FolderExists(cpath) Then FileObject.CreateFolder cpath
　Next
　Set FileObject = Nothing
　If Err.Number ＜＞ 0 Then
　　CreateDIR = False
　　Err.Clear
　Else
　　CreateDIR = True
　End If
End Function

function GetfileExt(byval filename)
　fileExt_a=split(filename,".")
　GetfileExt=lcase(fileExt_a(ubound(fileExt_a)))
end function

function getvirtual(str,path,urlhead)
　if left(str,7)="http://" then
　　url=str
　elseif left(str,1)="/" then
　　start=instrRev(str,"/")
　　if start=1 then
　　　url="/"
　　else
　　　url=left(str,start)
　　end if
　　url=urlhead&url
　　elseif left(str,3)="../" then
　　str1=mid(str,inStrRev(str,"../")+2)
　　ar=split(str,"../")
　　lv=ubound(ar)+1
　　ar=split(path,"/")
　　url="/"
　　for i=1 to (ubound(ar)-lv)
　　　url=url&ar(i)
　　next
　　url=url&str1
　　url=urlhead&url
　else
　　url=urlhead&str
　end if
　getvirtual=url
end function
'示例代码
dim dlpath

virtual="/downweb/"
truepath=server.MapPath(virtual)
if request("url")＜＞ "" then
　url=request("url")
　fn=getFileName(url)
　urlhead=left(url,(instr(replace(url,"//",""),"/")+1))
　urlpath=replace(left(url,instrRev(url,"/")),urlhead,"")
　strContent = getHTTPPage(url)
　mystr=strContent
　Set objRegExp = New Regexp
　objRegExp.IgnoreCase = True
　objRegExp.Global = True
　objRegExp.Pattern = "(src|href)=.[^\＞]+? "
　Set Matches =objRegExp.Execute(strContent)
　For Each Match in Matches
　　str=Match.Value
　　str=replace(str,"src=","")
　　str=replace(str,"href=","")
　　str=replace(str,"""","")
　str=replace(str,"'","")
filename=GetfileName(str)
　　getRet=getVirtual(str,urlpath,urlhead)
　　temp=Replace(getRet,"//","**")
　　start=instr(temp,"/")
　　endt=instrRev(temp,"/")-start+1
　　if start＞0 then
　　　repl=virtual&mid(temp,start)&" "
　　　'response.Write repl&"＜br＞"
　　　mystr=Replace(mystr,str,repl)

　　dir=mid(temp,start,endt)
　　temp=truepath&Replace(dir,"/","\")
　　CreateDir(temp)
　　'response.Write getRet&"||"&temp&filename&"＜br＞＜br＞"
　　SaveToFile getRet,temp&filename
　end if
Next
set Matches=nothing
end if

%＞