java写的简单通用线程池demo

首先声明，代码部分来自网络。

1、入口DabianTest：

package com.lbh.myThreadPool;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.lbh.myThreadPool.ThreadPool;

public class DabianTest {

    public static void main(String[] args) {
        
        //初始化池，并创建3条未执行任务的线程
        ThreadPool threadPool = new ThreadPool(3);
        threadPool.initPool();
        
        //模拟DTO
        List humanList = new ArrayList();
        for(int i=0; i<10;i++){
            Map human = new HashMap();
            human.put("name", "jack"+i);
            human.put("age", i+"");
            humanList.add(human);
        }
        
        //模拟BO，遍历任务，并添加到池中
        DabianImpl bianBian;
        for(int i = 0 ; i< humanList.size(); i++){
            Map myHuman = (Map)humanList.get(i);
            bianBian = new DabianImpl(myHuman.get("name").toString(),myHuman.get("age").toString());
            threadPool.addJob(bianBian);//向池中添加新任务
            
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

 

2：线程池ThreadPool

package com.lbh.myThreadPool;

import java.util.LinkedList;

/**
 * 线程池,包含调度及其他各种功能
 */
public class ThreadPool {
    
    protected int poolSize;//池默认容量
    protected LinkedList<DabianThread> threadList = new LinkedList<DabianThread>();
    protected boolean hasFreeThread = true;//池状态，true为有空闲线程。

    public ThreadPool(int poolSize) {
        this.poolSize = poolSize;
    }

    /**
     * 初始化池，创建等于池容量的线程数。
     */
    public void initPool() {
        for (int i = 0; i < poolSize; i++) {
            DabianThread dabianThread = new DabianThread(this);
            Thread thread = new Thread(dabianThread);
            thread.start();
            threadList.add(dabianThread);
        }
        System.out.println("初始化成功_"+"线程池容量："+poolSize);
    }
    
    /**
     * 添加新任务到空闲线程中
     */
    public void addJob(Dabian Dabian){
        //先拿到空闲线程
        DabianThread freeTh = getFreeThread();
        if(freeTh != null && freeTh.hasJob == false){
            freeTh.hasJob = true;
            freeTh.dabian = Dabian;
            freeTh.notifyJob();
        }
        else System.out.println("获取空线程失败，请检查。");
    }
    
    /**
     * 获取空闲线程
     */
    public DabianThread getFreeThread(){
        while(true){
            for(int i=0; i < threadList.size(); i++){
                DabianThread DabianTh = threadList.get(i);
                if(!DabianTh.hasJob){
                    return DabianTh;
                }
            }
            System.out.println("线程池已满，请等待。");
            hasFreeThread = false;//将池状态设置为false
            
            //阻塞，直到有空闲线程
            if(waitForFree()){
                continue;
            }
        }
    }
    
    /**
     *更新空闲线程状态 
     */
    public void updateFreeState(){
        this.hasFreeThread = true;
    }
    
    /**
     * 设置阻塞，直到有空闲线程
     */
    public boolean waitForFree(){
        
        while(!hasFreeThread){
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            continue;
        }
        return true;
    }
    
}

3、线程处理DabianThread

package com.lbh.myThreadPool;

/**
 *@comment  
 *@author LolOT
 *@date 2015-3-6 下午4:40:24
 *@version 1.0.0
 *@see
 */
public class DabianThread implements Runnable {

    ThreadPool pool;
    Dabian dabian;
    boolean hasJob;
    
    //初始化需要执行的线程对象
    DabianThread(ThreadPool pool){
        this.pool = pool;
        this.hasJob = false;
    }
    
    //唤醒休眠的线程，用于向池内添加任务时调用
    public synchronized void notifyJob() {
        hasJob = true;
        this.notify();
    }
    
    @Override
    //运行线程，这里判断一下该线程中是否有任务，没有的话就wait。
    public synchronized void run() {
        try {
            while (true) {
                if (!hasJob) {
                    pool.hasFreeThread = true;
                    System.out.println("当前线程空闲，线程号：" + Thread.currentThread().getId());
                    this.wait();
                } else {
                    dabian.process();
                    hasJob = false;
                }
            }
        } catch (InterruptedException e) {
            e.toString();
        }
    }
}

4、业务处理实现类DabianImpl

package com.lbh.myThreadPool;

import java.text.SimpleDateFormat;
import java.util.Date;

public class DabianImpl implements Dabian {
    
    String humanName;
    String humanAge;
    SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss SS");// 设置日期格式
    
    public DabianImpl(String humanName, String humanAge){
        this.humanName = humanName;
        this.humanAge = humanAge;
    }

    @Override
    public void process() {
        System.out.println("当前："+humanName+"开始大便。" + sdf.format(new Date())+"线程号："+Thread.currentThread().getId());
        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(humanName+"大便完成。" + sdf.format(new Date())+"线程号："+Thread.currentThread().getId());
    }
}

5、业务处理接口Dabian

/**
 * 
 */
package com.lbh.myThreadPool;

public interface Dabian {

    public void process();
}