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数据采集类

爬虫,又称蜘蛛,是从别的网站抓取资源的一种方法,C#.NET使用爬虫的方法如下:

protected string GetPageHtml(string url){string pageinfo;try{WebRequest myreq = WebRequest.Create(url);WebResponse myrep = myreq.GetResponse();StreamReader reader = new StreamReader(myrep.GetResponseStream(), Encoding.GetEncoding("gb2312"));pageinfo = reader.ReadToEnd();}catch{pageinfo = "";}return pageinfo;}

 

 


按上述方法就可以在程序中获取某URL的页面源文件。
但是有些网站屏蔽了爬虫,那就需要模拟浏览器获取的方法来进行,具体代码如下:

protected string GetPageHtml(string url){string pageinfo;try{HttpWebRequest myReq = (HttpWebRequest)HttpWebRequest.Create(url);myReq.Accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*";myReq.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)";HttpWebResponse myRep = (HttpWebResponse)myReq.GetResponse();Stream myStream = myRep.GetResponseStream();StreamReader sr = new StreamReader(myStream, Encoding.Default);pageinfo = sr.ReadToEnd().ToString();}catch{pageinfo = "";}return pageinfo;}