.NET下获取网页源码的几种方法

最新推荐文章于 2024-10-25 14:30:44 发布

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最新推荐文章于 2024-10-25 14:30:44 发布

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原文链接：http://www.cnblogs.com/yasin/archive/2011/01/06/1928978.html

本文介绍了两种从远程服务器获取网页内容的方法：使用WebClient组件及WebRequest对象。通过示例代码展示了如何下载网页数据并将其转换为字符串形式显示。

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/// <summary>
    /// 使用WebClient方法
    /// </summary>
    protected void WebClientButton_Click(object sender, EventArgs e)
    {
        pageUrl = UrlText.Text;
        WebClient wc = new WebClient();
        wc.Credentials = CredentialCache.DefaultCredentials;

        //方法一
        byte[] pageData = wc.DownloadData(pageUrl);
        ContentHtml.Text = Encoding.Default.GetString(pageData);

        /*
        //方法二
        Stream resStream = wc.OpenRead(pageurl);
        StreamReader sr = new StreamReader(resStream, Encoding.Default);
        ContentHtml.Text = sr.ReadToEnd();
        resStream.Close();
        */

        wc.Dispose();
    }

    /// <summary>
    /// 使用WebRequest方法
    /// </summary>
    protected void WebRequestButton_Click(object sender, EventArgs e)
    {
        pageUrl = UrlText.Text;
        WebRequest wrequest = WebRequest.Create(pageUrl);
        WebResponse wresponse = wrequest.GetResponse();
        Stream resStream = wresponse.GetResponseStream();
        StreamReader sr = new StreamReader(resStream, Encoding.Default);
        ContentHtml.Text = sr.ReadToEnd();
        resStream.Close();
        sr.Close();
    }

public string GetRemoteHtmlCode(string Url)
    {
        string s = null;
        try
        {
            MSXML2.XMLHTTP _xmlhttp = new MSXML2.XMLHTTPClass();
            _xmlhttp.open("GET", Url, false, null, null);
            _xmlhttp.send("");
            if (_xmlhttp.readyState == 4)
            {
                s = System.Text.Encoding.UTF8.GetString((byte[])_xmlhttp.responseBody);
            }

        }
        catch
        {
        }
        return s;
    }

    public string GetRemoteHtmlCodeByGB2312(string Url)
    {
        string s = null;
        try
        {
            MSXML2.XMLHTTP _xmlhttp = new MSXML2.XMLHTTPClass();
            _xmlhttp.open("GET", Url, false, null, null);
            _xmlhttp.send("");
            if (_xmlhttp.readyState == 4)
            {
                s = System.Text.Encoding.Default.GetString((byte[])_xmlhttp.responseBody);
            }
        }
        catch
        {
        }
        return s;
    }