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Spring Boot默认情况下，所有定时任务会在一个线程中去执行，下面看测试代码，定义了三个测试Job：
@Component
@Slf4j
public class TestJob {
@Scheduled(cron = "0/3 * * * * ? ")
public void job1() {
log.info("do job1 start");
try {
Thread.sleep(10000);
} catch (InterruptedException e) {
e.printStackTrace();
}
log.info("do job1 end");
}
@Scheduled(cron = "0/7 * * * * ? ")
public void job2() {
log.info("do job2");
}
@Scheduled(cron = "0/13 * * * * ? ")
public void job3() {
log.info("do job3");
}
}理论上，如果互不干扰的话，三个任务的触发时间点为：
job1触发：0,3,6,9,12……
job2触发：0,7,14,21,28,35,42,49,56
job3触发：0,13,26,39,52
实际执行结果：
2019-03-01 14:59:24 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job1 start
2019-03-01 14:59:34 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job1 end
2019-03-01 14:59:34 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job3
2019-03-01 14:59:34 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job2
2019-03-01 14:59:35 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job2
2019-03-01 14:59:36 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job1 start
2019-03-01 14:59:46 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job1 end
2019-03-01 14:59:46 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job3
2019-03-01 14:59:46 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job2
2019-03-01 14:59:48 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job1 start
2019-03-01 14:59:58 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job1 end
2019-03-01 14:59:58 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job2
2019-03-01 14:59:58 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job3
2019-03-01 15:00:00 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job2
2019-03-01 15:00:00 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job3
2019-03-01 15:00:00 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job1 start
2019-03-01 15:00:10 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job1 end
2019-03-01 15:00:10 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job2
2019-03-01 15:00:12 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job1 start
2019-03-01 15:00:22 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job1 end
2019-03-01 15:00:22 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job3
2019-03-01 15:00:22 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job2
2019-03-01 15:00:24 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job1 start
2019-03-01 15:00:34 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job1 end
2019-03-01 15:00:34 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job3
2019-03-01 15:00:34 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job2
2019-03-01 15:00:35 INFO 7868 --- [ scheduling-1] c.yclouds.service.demo.TestJob : do job2会看到他们的线程名都为schedule-1，观察line1-4，job1执行过程中，job2，job3触发时间到了，也没有执行。而是等job1结束后，立马执行一次（即使34秒的时候并不是它们的触发时间）。
上干货，并发执行多个定时任务，只需要新增一个线程池配置即可：
@Configuration
public class ScheduleConfig implements SchedulingConfigurer {
@Override
public void configureTasks(ScheduledTaskRegistrar scheduledTaskRegistrar) {
int corePoolSize = 5;
String nameFormat = "Schedule-Pool-%d";
// 设置线程名
ThreadFactory namedThreadFactory = new ThreadFactoryBuilder()
.setNameFormat(nameFormat).build();
// 初始化线程池
ThreadPoolExecutor threadPool = new ScheduledThreadPoolExecutor(corePoolSize,
namedThreadFactory);
scheduledTaskRegistrar.setScheduler(threadPool);
}
}下面再来看执行结果：
2019-03-01 15:21:00 INFO 11204 --- [Schedule-Pool-2] c.yclouds.service.demo.TestJob : do job1 start
2019-03-01 15:21:00 INFO 11204 --- [Schedule-Pool-4] c.yclouds.service.demo.TestJob : do job2
2019-03-01 15:21:00 INFO 11204 --- [Schedule-Pool-3] c.yclouds.service.demo.TestJob : do job3
2019-03-01 15:21:07 INFO 11204 --- [Schedule-Pool-4] c.yclouds.service.demo.TestJob : do job2
2019-03-01 15:21:10 INFO 11204 --- [Schedule-Pool-2] c.yclouds.service.demo.TestJob : do job1 end
2019-03-01 15:21:12 INFO 11204 --- [Schedule-Pool-2] c.yclouds.service.demo.TestJob : do job1 start
2019-03-01 15:21:13 INFO 11204 --- [Schedule-Pool-0] c.yclouds.service.demo.TestJob : do job3
2019-03-01 15:21:14 INFO 11204 --- [Schedule-Pool-3] c.yclouds.service.demo.TestJob : do job2
2019-03-01 15:21:21 INFO 11204 --- [Schedule-Pool-3] c.yclouds.service.demo.TestJob : do job2
2019-03-01 15:21:22 INFO 11204 --- [Schedule-Pool-2] c.yclouds.service.demo.TestJob : do job1 end
2019-03-01 15:21:24 INFO 11204 --- [Schedule-Pool-2] c.yclouds.service.demo.TestJob : do job1 start
2019-03-01 15:21:26 INFO 11204 --- [Schedule-Pool-0] c.yclouds.service.demo.TestJob : do job3
2019-03-01 15:21:28 INFO 11204 --- [Schedule-Pool-1] c.yclouds.service.demo.TestJob : do job2
2019-03-01 15:21:34 INFO 11204 --- [Schedule-Pool-2] c.yclouds.service.demo.TestJob : do job1 end
2019-03-01 15:21:35 INFO 11204 --- [Schedule-Pool-1] c.yclouds.service.demo.TestJob : do job2
2019-03-01 15:21:36 INFO 11204 --- [Schedule-Pool-0] c.yclouds.service.demo.TestJob : do job1 start
2019-03-01 15:21:39 INFO 11204 --- [Schedule-Pool-3] c.yclouds.service.demo.TestJob : do job3
2019-03-01 15:21:42 INFO 11204 --- [Schedule-Pool-4] c.yclouds.service.demo.TestJob : do job2
2019-03-01 15:21:46 INFO 11204 --- [Schedule-Pool-0] c.yclouds.service.demo.TestJob : do job1 end
2019-03-01 15:21:48 INFO 11204 --- [Schedule-Pool-0] c.yclouds.service.demo.TestJob : do job1 start
2019-03-01 15:21:49 INFO 11204 --- [Schedule-Pool-4] c.yclouds.service.demo.TestJob : do job2
2019-03-01 15:21:52 INFO 11204 --- [Schedule-Pool-2] c.yclouds.service.demo.TestJob : do job3
2019-03-01 15:21:56 INFO 11204 --- [Schedule-Pool-1] c.yclouds.service.demo.TestJob : do job2
2019-03-01 15:21:58 INFO 11204 --- [Schedule-Pool-0] c.yclouds.service.demo.TestJob : do job1 end
2019-03-01 15:22:00 INFO 11204 --- [Schedule-Pool-0] c.yclouds.service.demo.TestJob : do job1 start
2019-03-01 15:22:00 INFO 11204 --- [Schedule-Pool-1] c.yclouds.service.demo.TestJob : do job3
2019-03-01 15:22:00 INFO 11204 --- [Schedule-Pool-3] c.yclouds.service.demo.TestJob : do job2
2019-03-01 15:22:07 INFO 11204 --- [Schedule-Pool-3] c.yclouds.service.demo.TestJob : do job2
2019-03-01 15:22:10 INFO 11204 --- [Schedule-Pool-0] c.yclouds.service.demo.TestJob : do job1 end三个任务都在各自的线程里执行，到点就触发，互不干扰。