利用.NET框架提供的 WebClient类和 WebRequest类,我们可以很轻易地得到给定URL地址的源代码,很简单,以下是C#的完整的例子.

GetPageHtml.aspx

<%...@ Page language="c#" validateRequest = "false" Codebehind="GetPageHtml.aspx.cs"
AutoEventWireup="false" Inherits="eMeng.Exam.GetPageHtml" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
  <HEAD>
    <title>得到网页源代码</title>
    <meta name="GENERATOR" Content="Microsoft Visual Studio 7.0">
    <meta name="CODE_LANGUAGE" Content="C#">
    <meta name="vs_defaultClientScript" content="JavaScript">
    <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
  </HEAD>
  <body MS_POSITIONING="GridLayout">
    <form id="aspNetBuffer" method="post" runat="server">
      <div align="center" style="FONT-WEIGHT: bold">得到任意网页源代码</div>
      <asp:TextBox id="UrlText" runat="server" Width="400px">http://dotnet.aspx.cc/content.aspx
          </asp:TextBox>
      <asp:Button id="WebClientButton" Runat="server" Text="用WebClient得到"></asp:Button>
      <asp:Button id="WebRequestButton" runat="server" Text="用WebRequest得到"></asp:Button>
      <br>
      <asp:TextBox id="ContentHtml" runat="server" Width="100%" Height="360px" TextMode="MultiLine">
          </asp:TextBox>
    </form>
  </body>
</HTML>

GetPageHtml.aspx.cs

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
namespace eMeng.Exam
...{
/**//// <summary>
/// GetPageHtml 的摘要说明。
/// </summary>
public class GetPageHtml : System.Web.UI.Page
...{
protected System.Web.UI.WebControls.Button WebClientButton;
protected System.Web.UI.WebControls.Button WebRequestButton;
protected System.Web.UI.WebControls.TextBox ContentHtml;
protected System.Web.UI.WebControls.TextBox UrlText;
protected System.Web.UI.WebControls.Button GetText;
private string PageUrl = "";

private void Page_Load(object sender, System.EventArgs e)
...{}

Web Form Designer generated code

private void WebClientButton_Click(object sender, System.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：
/// ***************代码开始**********
/// Stream resStream = wc.OpenRead(PageUrl);
/// StreamReader sr = new StreamReader(resStream,System.Text.Encoding.Default);
/// ContentHtml.Text = sr.ReadToEnd();
/// resStream.Close();
/// **************代码结束********
///
wc.Dispose();
}

private void WebRequestButton_Click(object sender, System.EventArgs e)
...{
PageUrl = UrlText.Text;
WebRequest  request = WebRequest.Create(PageUrl);
WebResponse response = request.GetResponse();
Stream resStream = response.GetResponseStream();
StreamReader sr = new StreamReader(resStream, System.Text.Encoding.Default);
ContentHtml.Text = sr.ReadToEnd();
resStream.Close();
sr.Close();
}

private void GetText_Click(object sender, System.EventArgs e)
...{
    PageUrl = UrlText.Text;
    WebRequest  request = WebRequest.Create(PageUrl);
    WebResponse response = request.GetResponse();
    Stream resStream = response.GetResponseStream();
    StreamReader sr = new StreamReader(resStream, System.Text.Encoding.Default);
    ContentHtml.Text = sr.ReadToEnd();
    resStream.Close();
    sr.Close();
    ContentHtml.Text = Regex.Replace(ContentHtml.Text,"<[^>]*>", "");
    //替换空格
    ContentHtml.Text = Regex.Replace(ContentHtml.Text,"/s+", " ");
}
}
}

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