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  • C# 读取网页源代码

    using System.Net;
    using System.IO;

    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;
    }

    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;
    }

    还有一种使用WebBrower的方法,这里就不讨论了。

    另外编码方式,比如“utf-8”要填写具体网页的编码方式。

    可以用正则表达式将网页中的编码方式进行提取,再写入网页内容流时加个判断就好了。

    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。

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  • 原文地址:https://www.cnblogs.com/zhangweilong/p/2733972.html
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