利用WebClient和WebRequest类获得网页源代码

类别:.NET开发 点击:0 评论:0 推荐:
利用WebClient和WebRequest类获得网页源代码
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.

查看例子

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; 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(); } } }

本文地址:http://com.8s8s.com/it/it43211.htm