2021必修 CSS架构系统精讲



download:2021必修 CSS架构系统精讲



package com.zzger.model;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CountDownLatch;

import com.zzger.module.queue.UrlQueue;
import com.zzger.util.HttpUtils;
import com.zzger.util.RegexUtils;

public class WebSite {

/**
 * 站点url
 */
private String url;

/**
 * 需要爬行的url队列
 */
private UrlQueue<String> urls = new UrlQueue<>();

/**
 * 已爬行过的页面url
 */
private List<String> exitUrls = Collections.synchronizedList(new ArrayList<>());

private static final int TOTAL_THREADS = 12;  

private final CountDownLatch mStartSignal = new CountDownLatch(1);  

private final CountDownLatch mDoneSignal = new CountDownLatch(TOTAL_THREADS);   

public WebSite(String url){
    this.url = url;
    urls.offer(url);//把网站首页加入需要爬行的队列中
}

public void guangDu(){
    new Thread(new Runnable() {
        @Override
        public void run() {
            paxing(HttpUtils.httpGet(url));
        }
    }).start();
}

public void paxing(String html){
    if(html.lastIndexOf("下一页</a></li></ul></div>")<0)    return ;
    String strList = html.substring(html.indexOf("<li class=\\"next-page\\">"), 
            html.lastIndexOf("下一页</a></li></ul></div>"));
    String url = RegexUtils.RegexString("<a href=\\"(.+?)\\"", strList);
    if(url.equals("Nothing")) return ;
    urls.put(url);//把url存储到队列中
    paxing(HttpUtils.httpGet(url));
}

public void dxcPx(){
    Page<DuanZi> page = new Gxpage(urls.take());
    List<Section<DuanZi>> list = page.ybhqSection().getSections();
    for(Section<DuanZi> section : list){
        new Thread(new Runnable() {
            @Override
            public void run() {
                mStartSignal.countDown();// 计数减一为0,工作线程真正启动具体操作   
                try {
                    mStartSignal.await();// 阻塞,等待mStartSignal计数为0运行后面的代码   
                    // 所有的工作线程都在等待同一个启动的命令   
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                DuanZi duanzi = section.select().getModel();
                System.out.println(duanzi.getTitle());
                mDoneSignal.countDown();// 完成以后计数减一   
            }
        }
        ).start();
    }
    try
    {  
        mDoneSignal.await();// 等待所有工作线程结束   
    }  
    catch (InterruptedException e)  
    {  
        e.printStackTrace();  
    }  
    dxcPx();//线程任务执行完后,再次获取url队列进行任务
}
public static void main(String[] args) {
    WebSite web = new WebSite("http://duanziwang.com");
    web.guangDu();
    for(int i = 0; i<10;i++){
        new Thread(new Runnable() {
            @Override
            public void run() {
                web.dxcPx();
            }
        }).start();
    }

}

}

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转载自blog.51cto.com/15158179/2688155

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