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利用WebClient和WebRequest类获得网页源代码

2007-06-07 14:36 453 查看

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
{
/// &amp;lt;summary&amp;gt;
/// GetPageHtml 的摘要说明。
/// &amp;lt;/summary&amp;gt;
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 = &amp;quot;&amp;quot;;
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);
}
/// &amp;lt;summary&amp;gt;
/// 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。
/// &amp;lt;/summary&amp;gt;
private void InitializeComponent()
{
this.WebClientButton.Click += new System.EventHandler(this.WebClientButton_Click);
this.WebRequestButton.Click += new System.EventHandler(this.WebRequestButton_Click);
this.GetText.Click += new System.EventHandler(this.GetText_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();
}
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,&amp;quot;&amp;lt;[^&amp;gt;]*&amp;gt;&amp;quot;, &amp;quot;&amp;quot;);
//替换空格
ContentHtml.Text = Regex.Replace(ContentHtml.Text,&amp;quot;//s+&amp;quot;, &amp;quot; &amp;quot;);
}
}
}

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