ASP.NET抓取网页内容的实现方法

/// <summary>方法一：比较推荐 

/// 用HttpWebRequest取得网页源码 

/// 对于带BOM的网页很有效，不管是什么编码都能正确识别 

/// </summary> 

/// <param name="url">网页地址" </param> 

/// <returns>返回网页源文件</returns> 

public static string GetHtmlSource2(string url) 

{ 

    //处理内容 

    string html = ""; 

    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); 

    request.Accept = "*/*"; //接受任意文件 

    request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.1.4322)"; //  

    request.AllowAutoRedirect = true;//是否允许302 

    //request.CookieContainer = new CookieContainer();//cookie容器， 

    request.Referer = url; //当前页面的引用 

    HttpWebResponse response = (HttpWebResponse)request.GetResponse(); 

    Stream stream = response.GetResponseStream(); 

    StreamReader reader = new StreamReader(stream, Encoding.Default); 

    html = reader.ReadToEnd(); 

    stream.Close(); 

    return html; 

}

public static string GetHttpData2(string Url) 

{ 

    string sException = null; 

    string sRslt = null; 

    WebResponse oWebRps = null; 

    WebRequest oWebRqst = WebRequest.Create(Url); 

    oWebRqst.Timeout = 50000; 

    try 

    { 

        oWebRps = oWebRqst.GetResponse(); 

    } 

    catch (WebException e) 

    { 

        sException = e.Message.ToString(); 

    } 

    catch (Exception e) 

    { 

        sException = e.ToString(); 

    } 

    finally 

    { 

        if (oWebRps != null) 

        { 

            StreamReader oStreamRd = new StreamReader(oWebRps.GetResponseStream(), Encoding.GetEncoding("utf-8")); 

            sRslt = oStreamRd.ReadToEnd(); 

            oStreamRd.Close(); 

            oWebRps.Close(); 

        } 

    } 

    return sRslt; 

}