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C#获取指定网页HTML原代码可使用?WebClient?WebRequest?HttpWebRequest 三种方式来实现。
当然也可使用webBrowse！在此就不研究webBrowse如何获取了。
WebClient?
private string GetWebClient(string url) { ????string strHTML = ""; ????WebClient myWebClient = new WebClient(); ????Stream myStream = myWebClient.OpenRead(url); ????StreamReader sr = new StreamReader(myStream, System.Text.Encoding.GetEncoding("utf-8")); ????strHTML = sr.ReadToEnd(); ????myStream.Close(); ????return strHTML; } |
WebRequest?
private string GetWebRequest(string url) { ????Uri uri = new Uri(url); ????WebRequest myReq = WebRequest.Create(uri); ????WebResponse result = myReq.GetResponse(); ????Stream receviceStream = result.GetResponseStream(); ????StreamReader readerOfStream = new StreamReader(receviceStream, System.Text.Encoding.GetEncoding("utf-8")); ????string strHTML = readerOfStream.ReadToEnd(); ????readerOfStream.Close(); ????receviceStream.Close(); ????result.Close(); ????return strHTML; } |
HttpWebRequest?
private string GetHttpWebRequest(string url) { ????Uri uri = new Uri(url); ????HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create(uri); ????myReq.UserAgent = "User-Agent:Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705"; ????myReq.Accept = "*/*"; ????myReq.KeepAlive = true; ????myReq.Headers.Add("Accept-Language", "zh-cn,en-us;q=0.5"); ????HttpWebResponse result = (HttpWebResponse)myReq.GetResponse(); ????Stream receviceStream = result.GetResponseStream(); ????StreamReader readerOfStream = new StreamReader(receviceStream, System.Text.Encoding.GetEncoding("utf-8")); ????string strHTML = readerOfStream.ReadToEnd(); ????readerOfStream.Close(); ????receviceStream.Close(); ????result.Close(); ????return strHTML; } |
注意"utf-8"应与指定网页的编码对应。
总结
可以看到HttpWebRequest 方式最复杂，但确提供了更多的选择性。
有的网站检测客户端的UserAgent！如163.com，你如果使用WebClient?WebRequest方式获取时，将获取到的是错误提示页面内容。
而通过HttpWebRequest?就没问题。
源码下载：http://files.cnblogs.com/zjfree/GetHTML.rar
测试环境：WIN2003 + VS2005 + C# + winForm
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原文地址：http://www.cnblogs.com/qq260250932/p/5362099.html
