asp 采集实战代码
最近实在是太流行采集了，本人是不喜欢采集的，但对采集的原理我却很有兴趣进行研究，拿到了网上采集常用函数，对其进行了一番研究，并实战，结果成功，撇开效率问题，采集原理并不复杂，大家可以在搜索吧输入“采集”查看其原理。下面是一个采集的例子：
<%@LANGUAGE="VBSCRIPT" CODEPAGE="65001"%>
<% Response.CodePage=65001%>
<% Response.Charset="UTF-8" %>
<%Server.Scripttimeout=9999999
response.expires = 0
response.expiresabsolute = Now() - 1
response.addHeader "pragma","no-cache"
response.addHeader "cache-control","private"
Response.CacheControl = "no-cache"
%>
<%
'声明取得目标信息的函数,通过XML组件进行实现。
Function GetURL(url)
Set Retrieval = server.createobject("MSXML2.XMLHTTP")
With Retrieval
.Open "GET", url, False
.Send
If .Status<>200 then '判断文档是否已经解析完，以做客户端接受返回消息
exit function
End If
' 二进制转字符串
GetURL = sTb(.responsebody)
end with
'对取得信息进行验证，如果信息长度小于100则说明截取失败
End Function
' 二进制转字符串，否则会出现乱码的！
Function sTb(vin)
Const adTypeText = 2
Dim BytesStream,StringReturn
Set BytesStream = Server.CreateObject("ADODB.Stream")
With BytesStream
.Type = adTypeText
.Open
.WriteText vin
.Position = 0
.Charset = "GB2312"
.Position = 2
StringReturn = .ReadText
.Close
End With
Set BytesStream = Nothing
sTb = StringReturn
End Function
Function Newstring(Wstr,Strng)
Newstring=Instr(Lcase(Wstr),Lcase(Strng))
If Newstring<=0 Then Newstring=Len(Wstr)
End Function
'声明截取的格式，从Start开始截取，到Over为结束
Function GetKey(HTML,Start,Over)
Start=Newstring(HTML,start)
Over=Newstring(HTML,Over)
GetKey=Mid(HTML,Start,Over-start)
End Function
Dim Softid,Url,Html,Title
'采集百度知道
For i = 1 to 100
Url="http://zhidao.baidu.com/question/10000"&i&".html"
Html = GetURL(Url)
Question = GetKey(Html,""," ")
Answer = GetKey(Html,""," ")
Response.Write(Question&"
Response.Write(Answer)
Response.Write("采集成功")
Next
'打开数据库,准备入库
'dim connstr,conn,rs,sql
'connstr="DBQ="+server.mappath("db1.mdb")+";DefaultDir=;DRIVER={Microsoft Access Driver (*.mdb)};"
'set conn=server.createobject("ADODB.CONNECTION")
'conn.open connstr
'set rs=server.createobject("adodb.recordset")
'sql="select [列名] from [表名] where [列名]='"&Title&"'"
'rs.open sql,conn,3,3
'if rs.eof and rs.bof then
'rs("列名")=Title
'rs.update
'set rs=nothing
'end if
'set rs=nothing
%>
复制代码 代码如下:
<%@LANGUAGE="VBSCRIPT" CODEPAGE="65001"%>
<% Response.CodePage=65001%>
<% Response.Charset="UTF-8" %>
<%Server.Scripttimeout=9999999
response.expires = 0
response.expiresabsolute = Now() - 1
response.addHeader "pragma","no-cache"
response.addHeader "cache-control","private"
Response.CacheControl = "no-cache"
%>
<%
'声明取得目标信息的函数,通过XML组件进行实现。
Function GetURL(url)
Set Retrieval = server.createobject("MSXML2.XMLHTTP")
With Retrieval
.Open "GET", url, False
.Send
If .Status<>200 then '判断文档是否已经解析完，以做客户端接受返回消息
exit function
End If
' 二进制转字符串
GetURL = sTb(.responsebody)
end with
'对取得信息进行验证，如果信息长度小于100则说明截取失败
End Function
' 二进制转字符串，否则会出现乱码的！
Function sTb(vin)
Const adTypeText = 2
Dim BytesStream,StringReturn
Set BytesStream = Server.CreateObject("ADODB.Stream")
With BytesStream
.Type = adTypeText
.Open
.WriteText vin
.Position = 0
.Charset = "GB2312"
.Position = 2
StringReturn = .ReadText
.Close
End With
Set BytesStream = Nothing
sTb = StringReturn
End Function
Function Newstring(Wstr,Strng)
Newstring=Instr(Lcase(Wstr),Lcase(Strng))
If Newstring<=0 Then Newstring=Len(Wstr)
End Function
'声明截取的格式，从Start开始截取，到Over为结束
Function GetKey(HTML,Start,Over)
Start=Newstring(HTML,start)
Over=Newstring(HTML,Over)
GetKey=Mid(HTML,Start,Over-start)
End Function
Dim Softid,Url,Html,Title
'采集百度知道
For i = 1 to 100
Url="http://zhidao.baidu.com/question/10000"&i&".html"
Html = GetURL(Url)
Question = GetKey(Html,"
Answer = GetKey(Html,"
Response.Write(Question&"
Response.Write(Answer)
Response.Write("采集成功")
Next
'打开数据库,准备入库
'dim connstr,conn,rs,sql
'connstr="DBQ="+server.mappath("db1.mdb")+";DefaultDir=;DRIVER={Microsoft Access Driver (*.mdb)};"
'set conn=server.createobject("ADODB.CONNECTION")
'conn.open connstr
'set rs=server.createobject("adodb.recordset")
'sql="select [列名] from [表名] where [列名]='"&Title&"'"
'rs.open sql,conn,3,3
'if rs.eof and rs.bof then
'rs("列名")=Title
'rs.update
'set rs=nothing
'end if
'set rs=nothing
%>
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