标签：style blog http color 使用 os
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; }
标签：style blog http color 使用 os
原文地址：http://www.cnblogs.com/yujinchao88/p/3855051.html
