自定义线程池的名称（ThreadPoolExecutor）

目的：有时候为了快速定位出现错误的位置，在采用线程池时我们需要自定义线程池的名称。

1、创建ThreadFactory（ThreadPoolExecutor默认采用的是DefaultThreadFactory，可以参照代码）。

public class NamedThreadFactory implements ThreadFactory{

        private final AtomicInteger poolNumber = new AtomicInteger(1);

        private final ThreadGroup threadGroup;

        private final AtomicInteger threadNumber = new AtomicInteger(1);

        public  final String namePrefix;

        NamedThreadFactory(String name){
            SecurityManager s = System.getSecurityManager();
            threadGroup = (s != null) ? s.getThreadGroup() :
                    Thread.currentThread().getThreadGroup();
            if (null==name || "".equals(name.trim())){
                name = "pool";
            }
            namePrefix = name +"-"+
                    poolNumber.getAndIncrement() +
                    "-thread-";
        }

        @Override
        public Thread newThread(Runnable r) {
            Thread t = new Thread(threadGroup, r,
                    namePrefix + threadNumber.getAndIncrement(),
                    0);
            if (t.isDaemon())
                t.setDaemon(false);
            if (t.getPriority() != Thread.NORM_PRIORITY)
                t.setPriority(Thread.NORM_PRIORITY);
            return t;
        }
    }

2、创建线程池

 static ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(5,5,1,
            TimeUnit.MINUTES,new LinkedBlockingDeque<>(),new NamedThreadFactory("测试"));

3、测试代码

 static ThreadLocal<SimpleDateFormat>threadLocal = new ThreadLocal<SimpleDateFormat>(){
        @Override
        protected SimpleDateFormat initialValue() {
            return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        }
    };


 public static void main(String[] args) {
        threadPoolExecutor.execute(new Runnable() {
            @Override
            public void run() {
                try {
                    System.out.println(threadLocal.get().parse("2019-10-22 16:59:00"));
                    throw new NullPointerException("sfa");
                } catch (ParseException e) {
                    e.printStackTrace();
                }
            }
        });
    }

4、结果