实例讲解实现抓取网上房产信息的ASP程序

!-- #include file="inc/function.asp" -->
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
html>
head>
title>Untitled Document/title>
meta http-equiv="Content-Type" content="text/html; charset=gb2312">
meta http-equiv="refresh" content="300;URL=steal_house.asp">
/head>

body>
%
on error resume next
'
Server.ScriptTimeout = 999999
'========================================================
'字符编码函数
'====================================================
Function BytesToBstr(body,code)
        dim objstream
        set objstream = Server.CreateObject("adodb.stream")
        objstream.Type = 1
        objstream.Mode =3
        objstream.Open
        objstream.Write body
        objstream.Position = 0
        objstream.Type = 2
        objstream.Charset =code
        BytesToBstr = objstream.ReadText 
        objstream.Close
        set objstream = nothing
End Function

'取行字符串在另一字符串中的出现位置
Function Newstring(wstr,strng)
        Newstring=Instr(lcase(wstr),lcase(strng))
        if Newstring=0 then Newstring=Len(wstr)
End Function
'替换字符串函数
function ReplaceStr(ori,str1,str2)
ReplaceStr=replace(ori,str1,str2)
end function
'====================================================
function ReadXml(url,code,start,ends)
set oSend=createobject("Microsoft.XMLHTTP")
SourceCode = oSend.open ("GET",url,false)
oSend.send()
ReadXml=BytesToBstr(oSend.responseBody,code )
start=Instr(ReadXml,start)
ReadXml=mid(ReadXml,start)
ends=Instr(ReadXml,ends)
ReadXml=left(ReadXml,ends-1)
end function

function SubStr(body,start,ends)
start=Instr(body,start)
SubStr=mid(body,start+len(start)+1)
ends=Instr(SubStr,ends)
SubStr=left(SubStr,ends-1)
end function

dim getcont,NewsContent
dim url,title
url="http://www.***.com"'新闻网址knowsky.com
getcont=ReadXml(url,"gb2312","table class=k2 border=""0""","/table>")
getcont=RegexHtml(getcont)
dim KeyId,NewsClass,City,Position,HouseType,Level,Area,Price,Demostra

dim ContactMan,Contact
for i=2 to ubound(getcont)
 response.Write(getcont(i)"__br>")

 tempLink=mid(getcont(i),instr(getcont(i),"href=""")+6,instr(getcont(i),""" onClick")-10)
 tempLink=replace(tempLink,"../","")

 response.Write(i":"tempLink"br>")
 NewsContent=ReadXml(tempLink,"gb2312","td valign=""bottom"" width=""400"">","hr width=""760"" noshade size=""1"" color=""#808080""> ")
 NewsContent=RemoveHtml(NewsContent)
 NewsContent=replace(NewsContent,VbCrLf,"")
 NewsContent=replace(NewsContent,vbNewLine,"")
 NewsContent=replace(NewsContent," ","")
 NewsContent=replace(NewsContent," ","")
 NewsContent=replace(NewsContent,"nbsp;","")
 NewsContent=replace(NewsContent,"\n","")
 NewsContent=replace(NewsContent,chr(10),"")
 NewsContent=replace(NewsContent,chr(13),"")
 '===============get Content=======================
 response.Write(NewsContent)
 KeyId=SubStr(NewsContent,"列号：","信息类别：")
 NewsClass=SubStr(NewsContent,"类别：","所在城市：")
 City=SubStr(NewsContent,"城市：","房屋具体位置：")
 Position=SubStr(NewsContent,"位置：","房屋类型：")
 HouseType=SubStr(NewsContent,"类型：","楼层：")
 Level=SubStr(NewsContent,"楼层：","使用面积：")
 Area=SubStr(NewsContent,"面积：","房价：")
 Price=SubStr(NewsContent,"房价：","其他说明：")
 Demostra=SubStr(NewsContent,"说明：","联系人：")
 ContactMan=SubStr(NewsContent,"联系人：","联系方式：")
 Contact=SubStr(NewsContent,"联系方式：","信息来源：")
 response.Write("总序列号:"KeyId"br>")
 response.Write("信息类别:"NewsClass"br>")
 response.Write("所在城市:"City"br>")
 response.Write("房屋具体位置:"Position"br>")
 response.Write("房屋类型:"HouseType"br>")
 response.Write("楼层:"Level"br>")
 response.Write("使用面积:"Area"br>")
 response.Write("房价:"Price"br>")
 response.Write("其他说明:"Demostra"br>")
 response.Write("联系人:"ContactMan"br>")
 response.Write("联系方式:"Contact"br>")
 'title=RemoveHTML(aa(i))
 'response.Write("title:"title)
 for n=0 to application.Contents.count
   if(application.Contents(n)=KeyId) then
    ifexit=true    
   end if  
 next 
 if not ifexit then
   application(timei)=KeyId
 '添加到数据库
 '====================================================
 set rs=server.CreateObject("adodb.recordset")
 rs.open "select top 1 * from news order by id desc",conn,3,3
 rs.addnew
 rs("NewsClass")=NewsClass
 rs("City")=City
 rs("Position")=Position
 rs("HouseType")=HouseType
 rs("Level")=Level
 rs("Area")=Area
 rs("Price")=Price
 rs("Demostra")=Demostra
 rs("ContactMan")=ContactMan
 rs("Contact")=Contact
 rs.update
 rs.close
 set rs=nothing
 end if
 '==================================================

next
function RemoveTag(body)

 Set regEx = New RegExp
 regEx.Pattern = "[a].*?\/[a]>"
 regEx.IgnoreCase = True
 regEx.Global = True
 Set Matches = regEx.Execute(body)
 dim i,arr(15),ifexit
 i=0
 j=0
 For Each Match in Matches
  TempStr = Match.Value 
  TempStr=replace(TempStr,"td>","")
  TempStr=replace(TempStr,"/td>","")
  TempStr=replace(TempStr,"tr>","")
  TempStr=replace(TempStr,"/tr>","") 
  arr(i)=TempStr 
  i=i+1
  if(i>=15) then
   exit for
  end if
 Next
 Set regEx=nothing
 Set Matches =nothing
 RemoveTag=arr

end function
function RegexHtml(body)
 dim r_arr(47),r_temp
 Set regEx2 = New RegExp
 regEx2.Pattern ="a.*?\/a>"
 regEx2.IgnoreCase = True
 regEx2.Global = True
 Set Matches2 = regEx2.Execute(body)
 iii=0
 For Each Match in Matches2

  r_arr(iii)=Match.Value

  iii=iii+1 
 Next
 RegexHtml=r_arr
 set regEx2=nothing
 set Matches2=nothing
end function
'======================================================

conn.close
set conn=nothing
%>
/body>
/html>

　　function.asp

 %
'**************************************************
'函数名：gotTopic
'作  用：截字符串，汉字一个算两个字符，英文算一个字符
'参  数：str   ----原字符串
'       strlen ----截取长度
'返回值：截取后的字符串
'**************************************************
function gotTopic(str,strlen)
 if str="" then
  gotTopic=""
  exit function
 end if
 dim l,t,c, i
 str=replace(replace(replace(replace(str,"nbsp;"," "),"quot;",chr(34)),"gt;",">"),"lt;","")
 str=replace(str,"?","")
 l=len(str)
 t=0
 for i=1 to l
  c=Abs(Asc(Mid(str,i,1)))
  if c>255 then
   t=t+2
  else
   t=t+1
  end if
  if t>=strlen then
   gotTopic=left(str,i) "…"
   exit for
  else
   gotTopic=str
  end if
 next
 gotTopic=replace(replace(replace(replace(gotTopic," ","nbsp;"),chr(34),"quot;"),">","gt;"),"","lt;")
end function
'=========================================================
'函数：RemoveHTML(strHTML)
'功能：去除HTML标记
'参数：strHTML  --要去除HTML标记的字符串
'=========================================================
Function RemoveHTML(strHTML)
Dim objRegExp, Match, Matches
Set objRegExp = New Regexp

objRegExp.IgnoreCase = True
objRegExp.Global = True
'取闭合的>
objRegExp.Pattern = ".+?>"
'进行匹配
Set Matches = objRegExp.Execute(strHTML)

' 遍历匹配集合，并替换掉匹配的项目
For Each Match in Matches
strHtml=Replace(strHTML,Match.Value,"")
Next
RemoveHTML=strHTML
Set objRegExp = Nothing
set Matches=nothing
End Function

%>
 

　　conn.asp

 %
'on error resume next
set conn=server.CreateObject("adodb.connection")
con= "driver={Microsoft Access Driver (*.mdb)};dbq=" Server.MapPath("stest.mdb")
conn.open con

sub connclose
   conn.close
   set conn=nothing  
end sub
%>
 

　　附：抓取信息的详细页面事例