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用ASP编写下载网页中所有资源的程序

8.3分
出处:网络 时间:2011-07-04

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核心提示: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

  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

%>

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