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利用WebRequest和WebClient类获得网页源代码

2006-03-20 14:40 405 查看

GetURLHtml.aspx

<%@ Page language="c#" Codebehind="GetURLHtml.aspx.cs" Src="GetURLHtml.aspx.cs" AutoEventWireup="false" Inherits="Lion.Web.Forum.WebForm1" %>
<HTML>
<HEAD>
<title>Lion互动网络=>利用WebClient和WebRequest类获得网页源代码</title>
<META http-equiv="Content-Type" content="text/html; charset=gb2312">
</HEAD>
<body>
<form runat="server">
<asp:TextBox id="UrlText" runat="server" Width="50%">http://www.lionsky.net/mywebsite/index.aspx</asp:TextBox>
<asp:Button id="Button1" runat="server" Text="用WebClient得到"></asp:Button>
<asp:Button id="Button2" 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>

GetURLHtml.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;

namespace Lion.Web.Forum
{
/// <summary>
/// WebForm1 的摘要说明。
/// </summary>
public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.TextBox TextBox1;
protected System.Web.UI.WebControls.Button Button1;
protected System.Web.UI.WebControls.Button Button2;
protected System.Web.UI.WebControls.TextBox UrlText;
protected System.Web.UI.WebControls.TextBox ContentHtml;
protected System.Web.UI.WebControls.TextBox TextBox2;

#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
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.Button1.Click += new System.EventHandler(this.Button1_Click);
this.Button2.Click += new System.EventHandler(this.Button2_Click);

}
#endregion

private void Button1_Click(object sender, System.EventArgs e)
{
string PageUrl = UrlText.Text;
System.Net.WebClient wc = new System.Net.WebClient();
wc.Credentials = System.Net.CredentialCache.DefaultCredentials;

///方法一：
Byte[] pageData = wc.DownloadData(PageUrl);
ContentHtml.Text = System.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 Button2_Click(object sender, System.EventArgs e)
{
string PageUrl = UrlText.Text;
System.Net.WebRequest request = System.Net.WebRequest.Create(PageUrl);
System.Net.WebResponse response = request.GetResponse();
System.IO.Stream resStream = response.GetResponseStream();
System.IO.StreamReader sr = new System.IO.StreamReader(resStream, System.Text.Encoding.Default);
ContentHtml.Text = sr.ReadToEnd();
resStream.Close();
sr.Close();

}
}
}

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