Spring @Scheduled 多线程配置

Spring @Scheduled 多线程配置

环境

• SpringBoot 2.0.2.RELEASE
• JDK8

两种方式实现

1.@Scheduled+@Async

测试代码：

@SpringBootApplication
@EnableScheduling
@EnableAsync
public class ScheduleBootstrap {

  public static void main(String[] args) {
    SpringApplication.run(ScheduleBootstrap.class, args);
  }

  @Bean
  public TaskScheduler taskScheduler() {
    ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
    scheduler.setPoolSize(10);
    return scheduler;
  }

  @Scheduled(fixedRate = 100)
  @Async
  public void executeTask() throws InterruptedException {
    Thread.sleep(5000);
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
    LocalDateTime date = LocalDateTime.now();
    System.out.println(Thread.currentThread().getName() + ":" + date.format(formatter));
  }

}

执行结果：

taskScheduler-2:2020-12-16 15:14:14
taskScheduler-3:2020-12-16 15:14:14
taskScheduler-1:2020-12-16 15:14:14
taskScheduler-6:2020-12-16 15:14:14
taskScheduler-7:2020-12-16 15:14:14
taskScheduler-4:2020-12-16 15:14:14
taskScheduler-8:2020-12-16 15:14:14
taskScheduler-5:2020-12-16 15:14:14
taskScheduler-9:2020-12-16 15:14:14
taskScheduler-10:2020-12-16 15:14:14

taskScheduler-2:2020-12-16 15:14:19
taskScheduler-3:2020-12-16 15:14:19
taskScheduler-1:2020-12-16 15:14:19
taskScheduler-6:2020-12-16 15:14:19
taskScheduler-7:2020-12-16 15:14:19
taskScheduler-4:2020-12-16 15:14:19
taskScheduler-8:2020-12-16 15:14:19
taskScheduler-5:2020-12-16 15:14:19
taskScheduler-9:2020-12-16 15:14:19
taskScheduler-10:2020-12-16 15:14:19
...

每5秒中，10个线程同时执行

2.Java API

测试代码：

@SpringBootApplication
@EnableScheduling
public class ScheduleBootstrap {

  public static void main(String[] args) {
    SpringApplication.run(ScheduleBootstrap.class, args);
  }

  @Component
  class TaskJob {

    @PostConstruct
    public void init() {
      // 定时线程池
      ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
      scheduler.setPoolSize(10);
      scheduler.initialize();
      for (int i = 0; i < 10; i++) {
        scheduler.scheduleAtFixedRate(this::executeTask, 500);
      }
    }

    public void executeTask() {
      try {
        Thread.sleep(5000);
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        LocalDateTime date = LocalDateTime.now();
        System.out.println(Thread.currentThread().getName() + ":" + date.format(formatter));
      } catch (Exception e) {
        e.printStackTrace();
      }
    }
  }

}

执行结果

ThreadPoolTaskScheduler-9:2020-12-16 15:09:26
ThreadPoolTaskScheduler-4:2020-12-16 15:09:26
ThreadPoolTaskScheduler-7:2020-12-16 15:09:26
ThreadPoolTaskScheduler-3:2020-12-16 15:09:26
ThreadPoolTaskScheduler-5:2020-12-16 15:09:26
ThreadPoolTaskScheduler-2:2020-12-16 15:09:26
ThreadPoolTaskScheduler-10:2020-12-16 15:09:26
ThreadPoolTaskScheduler-8:2020-12-16 15:09:26
ThreadPoolTaskScheduler-1:2020-12-16 15:09:26
ThreadPoolTaskScheduler-6:2020-12-16 15:09:26

ThreadPoolTaskScheduler-2:2020-12-16 15:09:31
ThreadPoolTaskScheduler-3:2020-12-16 15:09:31
ThreadPoolTaskScheduler-9:2020-12-16 15:09:31
ThreadPoolTaskScheduler-7:2020-12-16 15:09:31
ThreadPoolTaskScheduler-8:2020-12-16 15:09:31
ThreadPoolTaskScheduler-6:2020-12-16 15:09:31
ThreadPoolTaskScheduler-10:2020-12-16 15:09:31
ThreadPoolTaskScheduler-5:2020-12-16 15:09:31
ThreadPoolTaskScheduler-1:2020-12-16 15:09:31
ThreadPoolTaskScheduler-4:2020-12-16 15:09:31
...

每5秒中，10个线程会同时执行，和方法一的结果一致。