如何用asp编写网站数据采集程序

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抓取网页实例51Testing软件测试网5r+Z1Z%suf/F

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例如要抓取六安信息港网页（http://market.ah163.net/city/AllDisplay.php?page=1&cityid=13），可以写一个2hand-cj.asp文件，在该文件中定义一个clsThief类，类中含有上面的子程序和函数，代码如下：51Testing软件测试网\\9W(\"`XLx3lr)A6R

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<%

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Dim Html,myThief,url_tittle

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'====采集六安信息港帖子网址列表

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set myThief=new clsThief 51Testing软件测试网\%pL)r
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GetUrl="http://market.ah163.net/city/AllDisplay.php?page=1&cityid=13"51Testing软件测试网MN jC,o8}E

myThief.src=GetUrl

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myThief.steal           '抓取远程GetUrl整个网页，并将该网页二进制代码转换成字符51Testing软件测试网5mZz}S

url_tittle=myThief.value             '抓取的网页存在url_tittle中51Testing软件测试网rI;f6s1G [l

Html=""&url_tittle&""                '最后结果存在Html中

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Response.write Html                 '显示结果51Testing软件测试网6Q CXx
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Response.write ""           

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set myThief=nothing                 '释放对象51Testing软件测试网 ]3PoP'_P)j

 

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Class clsThief    '定义一个clsThief类51Testing软件测试网%?:R%XJ GF2D2vf$mi(I

    Private value_    '窃取到的内容51Testing软件测试网R+R['p VxP]h"^

    Private src_      '要偷的目标URL地址51Testing软件测试网Y5u8ME4z?lo

    Private isGet_    '判断是否已经偷过51Testing软件测试网0K8tm-eG8z i$c

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    public property let src(str) '赋值—要偷的目标URL地址/属性

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        src_=str

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    end property51Testing软件测试网+Jh1G6H3v

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    public property get value '返回值—最终窃取并应用类方法加工过的内容/属性51Testing软件测试网(Oa JRKm

        value=value_51Testing软件测试网?D L3q9xap@

    end property51Testing软件测试网K4Y;G
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    private sub class_initialize() '初始化clsThief类

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        value_=""

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        src_=""51Testing软件测试网~x,]c5nk]

        isGet_= false51Testing软件测试网*@%|!z Rte)Zc

    end sub51Testing软件测试网 WN8| z~J'W)|^

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    public sub steal()       '窃取目标URL地址的HTML代码/方法

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        if src_<>"" then51Testing软件测试网7K8El~!t(eta

            dim Http

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            set Http=server.createobject("Micorosoft.XMLHTTP")

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            Http.open "GET",src_ ,false

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            Http.send()

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            if Http.readystate<>4 then 51Testing软件测试网I$w
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                exit sub51Testing软件测试网Vi_DR@XM~

            end if51Testing软件测试网UwX$s!K

            value_=BytesToBSTR(Http.responseBody,"GB2312")     '将网页二进制转换成字符

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            if len(value_)<100 then

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                response.write "获取远程文件 "&url&" 失败。"

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                response.end51Testing软件测试网U[JM?*k+u

            end if51Testing软件测试网%| P(SaCU3qm?F6O9t

            isGet_= True

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            set http=nothing

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            if err.number<>0 then err.Clear51Testing软件测试网hg;F.A-|GDS

        else

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            response.Write("alert(""请先设置src属性！"")")

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        end if51Testing软件测试网;o i)s(c2d2H-OUx

    end sub

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    private Function BytesToBstr(body,Cset)     '二进制转换成字符

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        dim objstream

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        set ōbjstream = Server.Createobject("adodb.stream")

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        objstream.Type = 1

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        objstream.Mode =3

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        objstream.Open

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        objstream.Write body

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        objstream.Position = 051Testing软件测试网0PyllQ2E

        objstream.Type = 2

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        objstream.Charset = Cset

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        BytesToBstr = objstream.ReadText 51Testing软件测试网B6vQNyxE

        objstream.Close51Testing软件测试网-@:V~,n3Zrxs8b

        set ōbjstream = nothing

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    End Function51Testing软件测试网 G@j:F1s wu|

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end class51Testing软件测试网9]+Tas ^? q!b

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解释一下以上程序中几个关键的语句：

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GetUrl=http://market.ah163.net/city/AllDisplay.php?page=1&cityid=13 '要采集的网址51Testing软件测试网"i]q| q%R`\

myThief.src=GetUrl                   '网址赋予myThief.src

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myThief.steal        '调用steal方法抓取远程网页，并将该网页二进制代码转换成字符

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url_tittle=myThief.value             '抓取的网页存放在url_tittle中51Testing软件测试网1U\ i8kTE

Html=""&url_tittle&""                '最后结果存放在Html中

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Response.write Html                  '使用response显示抓取的网页51Testing软件测试网/@h C,~.B X'}