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1yM9GKW yCJ

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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p\Y,C/v#@P$~

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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._)],Sc
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GetUrl="http://market.ah163.net/city/AllDisplay.php?page=1&cityid=13"51Testing软件测试网At"n6[RNXT*U

myThief.src=GetUrl51Testing软件测试网)c,j5I-h|tA1Y

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#?7F8_ eKv

url_tittle=myThief.value             '抓取的网页存在url_tittle中51Testing软件测试网p&d{LP(D`

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

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Response.write Html                 '显示结果

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Response.write ""           

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set myThief=nothing                 '释放对象

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Class clsThief    '定义一个clsThief类51Testing软件测试网-~(f4eXj S2Y#Yc8Rn

    Private value_    '窃取到的内容51Testing软件测试网 `e0q6u+u:HL |_

    Private src_      '要偷的目标URL地址

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    Private isGet_    '判断是否已经偷过51Testing软件测试网_wsO6d&p

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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k(q(bfr:n}"B[J5Q

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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 S-F:xj-d

        value=value_

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    end property

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    private sub class_initialize() '初始化clsThief类

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        value_=""51Testing软件测试网$ri'Ww*H-X wIP*|@%i

        src_=""51Testing软件测试网,y4Ay"Jib(~

        isGet_= false51Testing软件测试网r$Jt%_i H@Sl:z!O

    end sub51Testing软件测试网-B6X]0w} iKT

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    public sub steal()       '窃取目标URL地址的HTML代码/方法51Testing软件测试网 Kr~Zc"ON"hW

        if src_<>"" then51Testing软件测试网`(UI0Z`CvWA

            dim Http51Testing软件测试网Ur;H~M o

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

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            Http.open "GET",src_ ,false

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            Http.send()51Testing软件测试网E[_A1m8F

            if Http.readystate<>4 then 51Testing软件测试网1Wn8k:G[(W1]

                exit sub

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            end if

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            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9_kKaX\5U

            end if51Testing软件测试网F2bt2n%~m(s!o

            isGet_= True51Testing软件测试网#QPW\&[q

            set http=nothing51Testing软件测试网FW$F_/N$xk

            if err.number<>0 then err.Clear

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        else

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

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        end if

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    end sub51Testing软件测试网IPf
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    private Function BytesToBstr(body,Cset)     '二进制转换成字符51Testing软件测试网bii_qF@

        dim objstream51Testing软件测试网Iq@h$_~!|

        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 = 0

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        objstream.Type = 251Testing软件测试网XKmf7F?%E-e

        objstream.Charset = Cset51Testing软件测试网(Q4r&W8huvg@

        BytesToBstr = objstream.ReadText

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        objstream.Close

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        set ōbjstream = nothing51Testing软件测试网Z4??
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    End Function51Testing软件测试网7PDu)qN8vto

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end class51Testing软件测试网G{ gT|8o6\

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解释一下以上程序中几个关键的语句：51Testing软件测试网I+pN r9{Zz6D~

GetUrl=http://market.ah163.net/city/AllDisplay.php?page=1&cityid=13 '要采集的网址51Testing软件测试网pWX6X4fO'TH-GG

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s{(p,rsS,X$c

Html=""&url_tittle&""                '最后结果存放在Html中51Testing软件测试网-_b] YYE?-d

Response.write Html                  '使用response显示抓取的网页

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