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:https://files.cnblogs.com/zjfree/GetHTML.rar
测试环境:WIN2003 + VS2005 + C# + winForm
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