利用WebClient和WebRequest类获得网页源代码

发布时间:2007年10月17日      浏览次数:1449 次
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)
{}
#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.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,"<[^>]*>", "");
      //替换空格
      ContentHtml.Text = Regex.Replace(ContentHtml.Text,"\\s+", " ");
}
}
}
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