利用.NET框架提供的 WebClient类 和 WebRequest类,得到给定URL地址的源代码

作者：孟宪会 出自：【孟宪会之精彩世界】发布日期：2004年1月9日 9点24分42秒

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

<FONT style="BACKGROUND-COLOR: #9acd32"><FONT style="BACKGROUND-COLOR: #ffa500">
<!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></FONT></FONT>

GetPageHtml.aspx.cs

<FONT style="BACKGROUND-COLOR: #deb887"><FONT style="BACKGROUND-COLOR: #ffa500">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;

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;
  private string PageUrl = "";
 
  private void Page_Load(object sender, System.EventArgs e)
   {}

  #region Web Form Designer generated code
  override protected void OnInit(EventArgs e)
   {
   InitializeComponent();
   base.OnInit(e);
  }

  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {    
   this.WebClientButton.Click += new System.EventHandler(this.WebClientButton_Click);
   this.WebRequestButton.Click += new System.EventHandler(this.WebRequestButton_Click);
   this.Load += new System.EventHandler(this.Page_Load);
  }
  #endregion
 
  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();
  }
 }
}
</FONT></FONT>