多线程带智能采集策略的采集系统 (线程池)

using System; using System.Collections.Generic; using System.Text; using System.Net; using System.Threading; using CJData; using System.Text.RegularExpressions; using NLog;

namespace CJ {     /// <summary>     /// 写日志委托     /// </summary>     /// <param name="log"></param>     public delegate void WriteLogCallBack(String log);     /// <summary>     /// 采集     /// </summary>     public class CaiJi     {         private WebClient _wc;

        public WebClient Wc         {             get             {                 if (_wc == null) _wc = new WebClient();                 return _wc;             }         }         private Thread thread;

        public String Name = "";         public event WriteLogCallBack OnWriteLog;

        /// <summary>         /// 开始工作         /// </summary>         public void Start()         {             if (thread != null) return;             thread = new Thread(new ThreadStart(Work));             thread.Start();         }         /// <summary>         /// 停止工作         /// </summary>         public void Stop()         {             if (thread != null) thread.Abort();             thread = null;         }

        private void Work()         {             int times = 0;             while (times < 100)             {                 Url url = Url.SelectOne();                 try                 {                     if (url != null)                     {                         String page = Wc.DownloadString(url.UrlAddress);                         if (!String.IsNullOrEmpty(page))                         {                             OnWriteLog(Name + " 成功抓取：" + url.UrlAddress);                             times = 0;                             ThreadPool.QueueUserWorkItem(new WaitCallback(ParsePage), new Object[] { url, page });                         }                     }                     else                     {                         //OnWriteLog(Name + " 没有工作，休息半秒");                         times++;                         //没有工作，休息半秒                         Thread.Sleep(500);                     }                 }                 catch (ThreadAbortException e)                 {                     OnWriteLog(Name + " 外部终止");                     break;                 }                 catch (Exception e)                 {                     times++;                     OnWriteLog(Name + " 赚取" + url.UrlAddress + "出错，休息半秒。" + e.Message);                     Trace.WriteLine(url.UrlAddress);                     //出错，休息半秒                     Thread.Sleep(500);                 }             }             OnWriteLog(Name + " 完成！");         }

        private void ParsePage(Object state)         {             Object[] objs = (Object[])state;             Url url = objs[0] as Url;             String page = (String)objs[1];             IList<Rule> rs = Rule.SelectAll(Rule._.FromTypeID, url.TypeID);             //if (url.PageType.TypeName == "详细页")             if (rs == null || rs.Count < 1)             {                 CjPage cp = new CjPage();                 cp.CjTime = DateTime.Now;                 cp.Content = page;                 cp.Url = url.UrlAddress;                 cp.TypeID = url.TypeID;                 cp.Insert();             }             else             {                 foreach (Rule r in rs)                 {                     ParseUrl(url, r, page);                 }             }         }         private void ParseUrl(Url u, Rule r, String page)         {             Regex reg = new Regex(r.Pattern, RegexOptions.Compiled | RegexOptions.IgnoreCase);             MatchCollection ms = reg.Matches(page);             foreach (Match m in ms)             {                 Url url = new Url();                 url.TypeID = r.ToTypeID;                 url.UrlAddress = m.Groups[1].Value;                 if (!url.UrlAddress.StartsWith("http://"))                 {                     if (url.UrlAddress.Substring(0, 1) == "/")                     {                         url.UrlAddress = u.UrlAddress.Substring(0, u.UrlAddress.IndexOf("/", 8)) + url.UrlAddress;                     }                     else                     {                         if (u.UrlAddress.Substring(u.UrlAddress.Length - 1) == "/")                             url.UrlAddress = u.UrlAddress + url.UrlAddress;                         else                             if (u.UrlAddress.LastIndexOf("/") < u.UrlAddress.LastIndexOf("."))                                 url.UrlAddress = u.UrlAddress.Substring(0, u.UrlAddress.LastIndexOf("/") + 1) + url.UrlAddress;                             else                                 url.UrlAddress = u.UrlAddress + "/" + url.UrlAddress;                     }                 }                 url.Insert();             }         }     } }

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Net;

namespace CJ {     public partial class Form1 : Form     {         public Form1()         {             InitializeComponent();         }

        CaiJi[] cjs;         private void button1_Click(object sender, EventArgs e)         {             Button btn = sender as Button;             if (btn.Text == "停止")             {                 foreach (CaiJi cj in cjs)                 {                     if (cj != null) cj.Stop();                 }                 cjs = null;                 btn.Text = "开始";                 return;             }

            richTextBox1.Text = "";             btn.Text = "停止";

            int k = 100;             if (!int.TryParse(textBox1.Text, out k)) k = 100;             cjs = new CaiJi[k];             for (int i = 0; i < cjs.Length; i++)             {                 cjs[i] = new CaiJi();                 cjs[i].Name = "线程" + i.ToString("00");                 cjs[i].OnWriteLog += new WriteLogCallBack(cj_OnWriteLog);             }             foreach (CaiJi cj in cjs)             {                 cj.Start();             }         }

        void cj_OnWriteLog(string log)         {             if (richTextBox1.InvokeRequired)             {                 richTextBox1.Invoke(new WriteLogCallBack(cj_OnWriteLog), new object[] { log });             }             else             {                 if (richTextBox1.Lines.Length > 3000) richTextBox1.Text = "";                 richTextBox1.Text = log + Environment.NewLine + richTextBox1.Text;             }         }     } }