Springboot定时任务Scheduled重复执行操作

@Component
public class TestJob {
 @Scheduled(cron = "* 0/2 * * * *")
 public void test() {
 System.out.println("测试开始");
 System.out.println("测试结束");
 }
}

@Component
public class TestJob {
 @Scheduled(cron = "* 0/2 * * * *")
 public void test() {
 System.out.println("测试开始");
 System.out.println("测试结束");
 try {
  Thread.sleep(60000);
 } catch (InterruptedException e) {
  e.printStackTrace();
 }
 System.out.println("睡眠结束");
 }
}

public Date next(Date date) {
    Calendar calendar = new GregorianCalendar();
    calendar.setTimeZone(this.timeZone);
    calendar.setTime(date);
   //1.设置下次执行时间的毫秒为0，如上次任务执行过程不足1秒，则calendar的时间会被设置成上次任务的执行时间
    calendar.set(14, 0);
    long originalTimestamp = calendar.getTimeInMillis();
    this.doNext(calendar, calendar.get(1));
   //2.由于有上面一步，执行时间太短，会导致下述条件为true
    if(calendar.getTimeInMillis() == originalTimestamp) {
   //3.calendar在原来的时间上增加1秒
      calendar.add(13, 1);
   //CronSequenceGenerator的doNext算法从指定时间开始(包括指定时间)查找符合cron表达式规则下一个匹配的时间
   //注意第一个匹配符是*，由于增加了1秒，依然符合cron="* 0/2 * * * *"，所以下一个执行时间就是在原来的基础上增加了一秒
      this.doNext(calendar, calendar.get(1));
    }
    return calendar.getTime();
  }

@Configuration("myScheduled")
@EnableScheduling
public class ScheduledDemo{
  //每10秒执行一次
  @Scheduled(cron="0/10 * * * * ?")
  public void timmer(){
 System.out.println("执行任务");
  }
}  

//通过setCron 方法修改 任务周期
@Component("myScheduled")
public class ScheduledDemo implements SchedulingConfigurer{
 //默认的任务周期为 10秒
 private String cron = "0/10 * * * * ?";
 
 @Override
 public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
 // TODO Auto-generated method stub
 taskRegistrar.addTriggerTask(new Runnable() {
 
  @Override
  public void run() {
  // TODO Auto-generated method stub
  System.out.println("执行任务");
  }
  
 }, new Trigger() {
  @Override
  public Date nextExecutionTime(TriggerContext triggerContext) {
  return new CronTrigger(cron).nextExecutionTime(triggerContext);
  }
 });
 }
 
 public void setCron(String cron) {
 this.cron = cron;
 }
}

@Component("myScheduled")
public class ScheduledImpl{
 private ScheduledFuture<?> future;
 
 @Autowired
 private ThreadPoolTaskScheduler threadPoolTaskScheduler;
 
 @Bean
 public ThreadPoolTaskScheduler threadPoolTaskScheduler() {
 return new ThreadPoolTaskScheduler();
 }
 
 @Override
 public void setCron(final String cron) {
 stopCron();
 future = threadPoolTaskScheduler.schedule(new Runnable() {
  @Override
  public void run() {
  // TODO Auto-generated method stub
  System.out.println("执行任务");
  }
 }, new Trigger() {
  @Override
  public Date nextExecutionTime(TriggerContext triggerContext) {
  if(cron==null || "".equals(cron)) {
   return null;
  }
  CronTrigger cronTrigger = new CronTrigger(cron);
  return cronTrigger.nextExecutionTime(triggerContext);
  }
 });
 }
 
 @Override
 public void stopCron() {
 if(future!=null) {
  future.cancel(true);
 }
 } 
}