使用线程池和单线程

Posted 2020-08-22

 

/**
* 使用线程池和单线程
**/
public class TestTask {

    public static void main(String[] args) throws InterruptedException {
        long currentTimeMillis = System.currentTimeMillis();
        System.out.println("currentTimeMillis:" + currentTimeMillis);
        useThreadPool();
        System.out.println("cost:" + (System.currentTimeMillis() - currentTimeMillis));
        System.out.println("===================================================");
        currentTimeMillis = System.currentTimeMillis();
        useSinglePool();
        System.out.println("cost:" + (System.currentTimeMillis() - currentTimeMillis));

    }

    /**
     * 
     */
    private static void useSinglePool() {
        for (int i = 0; i < 10; i++) {
            doTask(RandomStringUtils.randomAlphanumeric(10), RandomStringUtils.randomAlphanumeric(5));
        }
    }

    /**
     * 
     */
    private static void useThreadPool() {
        ExecutorService es = Executors.newFixedThreadPool(10);
        List<Future<Boolean>> list = new ArrayList<Future<Boolean>>();
        for (int i = 0; i < 10; i++) {
            Future<Boolean> future = es.submit(new Callable<Boolean>() {

                @Override
                public Boolean call() {
                    return doTask(RandomStringUtils.randomAlphanumeric(10), RandomStringUtils.randomAlphanumeric(5));
                }
            });
            list.add(future);
        }
　　　　 //关闭线程池，等旧任务执行完，并停止接收新任务
        es.shutdown();
        try {
　　　　　　　//获取处理结果
            for (Future<Boolean> future : list) {
                System.out.println(future.get());
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }
    }

    public static boolean doTask(String arg1, String arg2) {
        System.out.println(Thread.currentThread() + ":" + arg1 + "_" + arg2);
        try {
　　         //模拟业务处理时长
            Thread.sleep(1000);
            return true;
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return false;
        }
    }
}

 

　　

currentTimeMillis:1481104024029
Thread[pool-1-thread-2,5,main]:yaJSUdkD4f_v3rqW
Thread[pool-1-thread-3,5,main]:PpQbrtr7wP_KE78z
Thread[pool-1-thread-10,5,main]:LSODdw5Zqk_4LxLY
Thread[pool-1-thread-7,5,main]:KDseIk6FJ9_84qra
Thread[pool-1-thread-6,5,main]:ucm8VSevwB_WVOhS
Thread[pool-1-thread-4,5,main]:c132FVrokB_gtQDt
Thread[pool-1-thread-9,5,main]:KKcWv3rmVc_GR9LZ
Thread[pool-1-thread-5,5,main]:clXJOjW6F4_TlEzf
Thread[pool-1-thread-8,5,main]:aQBLjR4BTG_KwqBG
Thread[pool-1-thread-1,5,main]:jtyxUhMTSa_ykpVu
true
true
true
true
true
true
true
true
true
true
cost:1163
===================================================
Thread[main,5,main]:ncJJsfIfDH_pu7mj
Thread[main,5,main]:cFTiqRR8SZ_kXgYz
Thread[main,5,main]:k27V4Xzs43_9x7iC
Thread[main,5,main]:Butab2DJHb_4ePjg
Thread[main,5,main]:qhGBE1iyBE_SHOGj
Thread[main,5,main]:DEhiau4dqG_fxNa0
Thread[main,5,main]:byTFoqVkBC_Lb7vm
Thread[main,5,main]:Q544NhN0Lr_rpbwS
Thread[main,5,main]:5nNdV1G1nQ_VkvAK
Thread[main,5,main]:N3j4o8INfl_eLruR
cost:10001