.NET2.0抓取网页全部链接

最新推荐文章于 2025-11-24 00:49:10 发布

原创最新推荐文章于 2025-11-24 00:49:10 发布 · 457 阅读

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CC 4.0 BY-SA版权

文章标签：

#.net #textbox #button #string #server #regex

本文介绍了一个使用C#编写的简单网页链接抓取器。该抓取器通过输入目标网址，能够从网页中提取所有链接地址，并显示在界面上。采用正则表达式匹配链接，同时利用集合来去除重复项。

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text.RegularExpressions;
using System.Net;
using System.IO;
using System.Collections;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {

        }

    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        TextBox2.Text = "";
        string web_url = this.TextBox1.Text;//"http://blog.youkuaiyun.com/21aspnet/"
        string all_code = "";
        HttpWebRequest all_codeRequest = (HttpWebRequest)WebRequest.Create(web_url);
        WebResponse all_codeResponse = all_codeRequest.GetResponse();
        StreamReader the_Reader = new StreamReader(all_codeResponse.GetResponseStream());
        all_code = the_Reader.ReadToEnd();
        the_Reader.Close();
        ArrayList my_list = new ArrayList();
        string p = @"http://([/w-]+/.)+[/w-]+(/[/w- ./?%&=]*)?";
        Regex re = new Regex(p, RegexOptions.IgnoreCase);
        MatchCollection mc = re.Matches(all_code);

        for (int i = 0; i <= mc.Count - 1; i++)
        {
            bool _foo = false;
            string name = mc[i].ToString();
            foreach (string list in my_list)
            {
                if (name == list)
                {
                    _foo = true;
                    break;
                }
            }//过滤

            if (!_foo)
            {
                TextBox2.Text += name + "/n";
            }
        }
    }
}

前台
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>抓取网页所有链接</title>

</head>
<body >
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="TextBox1" runat="server" Width="481px"></asp:TextBox>
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="提取" />
        <br />
        <asp:TextBox ID="TextBox2" runat="server" Height="304px" TextMode="MultiLine" Width="524px"></asp:TextBox></div>
    </form>
</body>
</html>