线程池

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把一个任务分解成多个任务，而由于任务太多，不能一次并发执行，需把这些任务进行分批处理，用线程池来处理此问题。

import org.apache.log4j.Logger;public class TaskStartProcessor implements Runnable{    private static Logger logger = Logger.getLogger(TaskStartProcessor.class);    private DataTaskInterface dataTask;    public TaskStartProcessor() {    }    public TaskStartProcessor(DataTaskInterface dataTask) {        this.dataTask = dataTask;    }    @Override    public void run() {        logger.info("正在執行子任務"+dataTask.getId());        dataTask.start();        logger.info("子任務"+dataTask.getId()+"执行完毕");    }}

ThreadPoolExecutor executor = new ThreadPoolExecutor(5, 500, 2000, TimeUnit.MILLISECONDS,                new ArrayBlockingQueue<Runnable>(5));        for(DataTaskInterface dataTask:dataTasks){            TaskStartProcessor taskProcessor = new TaskStartProcessor(dataTask);            executor.execute(taskProcessor);            System.out.println("线程池中线程数目："+executor.getPoolSize()+"，队列中等待执行的任务数目："+ executor.getQueue().size()+"，已执行玩别的任务数目："+executor.getCompletedTaskCount());        }        executor.shutdown();

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