C#实现网页爬虫
2016-01-30 10:47
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HTTP请求工具类(功能:1、获取网页html;2、下载网络图片;):
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using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.IO; using System.Linq; using System.Text; using System.Text.RegularExpressions; using System.Threading; using System.Threading.Tasks; using System.Windows.Forms; using Utils; namespace 爬虫 { public partial class Form1 : Form { List<Thread> threadList = new List<Thread>(); Thread thread = null; public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { DateTime dtStart = DateTime.Now; button3.Enabled = true; button2.Enabled = true; button1.Enabled = false; int page = 0; int count = 0; int personCount = 0; lblPage.Text = "已完成页数:0"; int index = 0; for (int i = 1; i <= 10; i++) { thread = new Thread(new ParameterizedThreadStart(delegate(object obj) { for (int j = 1; j <= 10; j++) { try { index = (Convert.ToInt32(obj) - 1) * 10 + j; string pageHtml = HttpRequestUtil.GetPageHtml("http://tt.mop.com/c44/0/1_" + index.ToString() + ".html"); Regex regA = new Regex("<a[\\s]+class=\"J-userPic([^<>]*?)[\\s]+href=\"([^\"]*?)\""); Regex regImg = new Regex("<p class=\"tc mb10\"><img[\\s]+src=\"([^\"]*?)\""); MatchCollection mc = regA.Matches(pageHtml); foreach (Match match in mc) { int start = match.ToString().IndexOf("href=\""); string url = match.ToString().Substring(start + 6); int end = url.IndexOf("\""); url = url.Substring(0, end); if (url.IndexOf("/") == 0) { string imgPageHtml = HttpRequestUtil.GetPageHtml("http://tt.mop.com" + url); personCount++; lblPerson.Invoke(new Action(delegate() { lblPerson.Text = "已完成条数:" + personCount.ToString(); })); MatchCollection mcImgPage = regImg.Matches(imgPageHtml); foreach (Match matchImgPage in mcImgPage) { start = matchImgPage.ToString().IndexOf("src=\""); string imgUrl = matchImgPage.ToString().Substring(start + 5); end = imgUrl.IndexOf("\""); imgUrl = imgUrl.Substring(0, end); if (imgUrl.IndexOf("http://i1") == 0) { try { HttpRequestUtil.HttpDownloadFile(imgUrl); count++; lblNum.Invoke(new Action(delegate() { lblNum.Text = "已下载图片数" + count.ToString(); DateTime dt = DateTime.Now; double time = dt.Subtract(dtStart).TotalSeconds; if (time > 0) { lblSpeed.Text = "速度:" + (count / time).ToString("0.0") + "张/秒"; } })); } catch { } Thread.Sleep(1); } } } } } catch { } page++; lblPage.Invoke(new Action(delegate() { lblPage.Text = "已完成页数:" + page.ToString(); })); if (page == 100) { button1.Invoke(new Action(delegate() { button1.Enabled = true; })); MessageBox.Show("完成!"); } } })); thread.Start(i); threadList.Add(thread); } } private void button2_Click(object sender, EventArgs e) { button1.Invoke(new Action(delegate() { foreach (Thread thread in threadList) { if (thread.ThreadState == ThreadState.Suspended) { thread.Resume(); } thread.Abort(); } button1.Enabled = true; button2.Enabled = false; button3.Enabled = false; button4.Enabled = false; })); } private void Form1_FormClosing(object sender, FormClosingEventArgs e) { foreach (Thread thread in threadList) { thread.Abort(); } } private void button3_Click(object sender, EventArgs e) { foreach (Thread thread in threadList) { if (thread.ThreadState == ThreadState.Running) { thread.Suspend(); } } button3.Enabled = false; button4.Enabled = true; } private void button4_Click(object sender, EventArgs e) { foreach (Thread thread in threadList) { if (thread.ThreadState == ThreadState.Suspended) { thread.Resume(); } } button3.Enabled = true; button4.Enabled = false; } } }
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