程序实现功能：自动将远程页面的文件中的图片下载到本地服务器

'将下文保存为 save2local.asp
'测试：save2local.asp?url=http://ent.sina.com.cn/s/m/2003-11-11/1411231388.html

<%
'参数设置开始
url =  request("url")
localaddr = server.MapPath("images_remote/") '保存到本地的目录
localdir = "images_remote/" 'http 访问的相对路径
AllowFileExt = "jpg|bmp|png|gif" '支持的文件名格式
'参数设置完毕

if createdir(localaddr) = false then
 response.Write "创建目录失败，请检查目录权限"
 response.End
end if
response.Write Convert2LocalAddr(url,localaddr,localdir)

function Convert2LocalAddr(url,localaddr,localdir)
  '参数说明
  'url 页面地址
  'localaddr 保存本地的物理地址
  'localdir 相对路径
 strContent = getHTTPPage(url)
 Set objRegExp = New Regexp
 objRegExp.IgnoreCase = True
 objRegExp.Global = True
 objRegExp.Pattern = "<img.+?>"
 Set Matches =objRegExp.Execute(strContent)
 For Each Match in Matches
  RetStr = RetStr & GetRemoteImages(Match.Value)
 Next
 ImagesArray=split(RetStr,"||")
 RemoteImage=""
 LocalImage=""
 for i=1 to ubound(ImagesArray)
  if ImagesArray(i)<>"" and instr(RemoteImage,ImagesArray(i))<1 then
   fname=baseurl&cstr(i&mid(ImagesArray(i),instrrev(ImagesArray(i),".")))
   ImagesFileName = ImagesArray(i)
   AllowFileExtArray = split(AllowFileExt,"|")
   isGetFile = false
   for tmp = 0 to ubound(AllowFileExtArray)
    if lcase(GetFileExt(ImagesFileName)) = ALlowFileExtArray(tmp) then
     isGetFile=True
    end if
   next
   if isGetFile = true then
    newfilename =  GenerateRandomFileName(fname)
    call Save2Local(ImagesFileName,localaddr & "/" & newfilename)
    RemoteImage=RemoteImage&"||"& ImagesFileName
    LocalImage=LocalImage&"||" & localdir & newfilename
   end if
  end if
 next
 arrnew=split(LocalImage,"||")
 arrall=split(RemoteImage,"||")
 for i=1 to ubound(arrnew)
  strContent=replace(strContent,arrall(i),arrnew(i))
 next
 Convert2LocalAddr = strContent
end function

function GetRemoteImages(str)
 Set objRegExp1 = New Regexp
 objRegExp1.IgnoreCase = True
 objRegExp1.Global = True
 objRegExp1.Pattern = "http://.+? "
 set mm=objRegExp1.Execute(str)
 For Each Match1 in mm
  tmpaddr = left(Match1.Value,len(Match1.Value)-1)
  GetRemoteImages=GetRemoteImages&"||" & replace(replace(tmpaddr,"""",""),"'","")
 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 getHTTPimg(url)
 on error resume next
 dim http
 set http=server.createobject("MSXML2.X