• c# 获取网页源码 PHP


    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


    欢迎转载,转载请注明:转载自[ http://www.cnblogs.com/zjfree/ ]
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  • 原文地址:https://www.cnblogs.com/zjfree/p/1980325.html
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