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ASP另类速成法 用ASP编写下载网页中所有资源的程序


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关键字:ASP 2006-9-16

 

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

%>

ASP另类速成法 用ASP编写下载网页中所有资源的程序

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