@Component
public class TestJob {
 @Scheduled(cron = "* 0/2 * * * *")
 public void test() {
 System.out.println("測(cè)試開(kāi)始");
 System.out.println("測(cè)試結(jié)束");
 }
}

@Component
public class TestJob {
 @Scheduled(cron = "* 0/2 * * * *")
 public void test() {
 System.out.println("測(cè)試開(kāi)始");
 System.out.println("測(cè)試結(jié)束");
 try {
  Thread.sleep(60000);
 } catch (InterruptedException e) {
  e.printStackTrace();
 }
 System.out.println("睡眠結(jié)束");
 }
}

public Date next(Date date) {
    Calendar calendar = new GregorianCalendar();
    calendar.setTimeZone(this.timeZone);
    calendar.setTime(date);
   //1.設(shè)置下次執(zhí)行時(shí)間的毫秒為0，如上次任務(wù)執(zhí)行過(guò)程不足1秒，則calendar的時(shí)間會(huì)被設(shè)置成上次任務(wù)的執(zhí)行時(shí)間
    calendar.set(14, 0);
    long originalTimestamp = calendar.getTimeInMillis();
    this.doNext(calendar, calendar.get(1));
   //2.由于有上面一步，執(zhí)行時(shí)間太短，會(huì)導(dǎo)致下述條件為true
    if(calendar.getTimeInMillis() == originalTimestamp) {
   //3.calendar在原來(lái)的時(shí)間上增加1秒
      calendar.add(13, 1);
   //CronSequenceGenerator的doNext算法從指定時(shí)間開(kāi)始(包括指定時(shí)間)查找符合cron表達(dá)式規(guī)則下一個(gè)匹配的時(shí)間
   //注意第一個(gè)匹配符是*，由于增加了1秒，依然符合cron="* 0/2 * * * *"，所以下一個(gè)執(zhí)行時(shí)間就是在原來(lái)的基礎(chǔ)上增加了一秒
      this.doNext(calendar, calendar.get(1));
    }
    return calendar.getTime();
  }

@Configuration("myScheduled")
@EnableScheduling
public class ScheduledDemo{
  //每10秒執(zhí)行一次
  @Scheduled(cron="0/10 * * * * ?")
  public void timmer(){
 System.out.println("執(zhí)行任務(wù)");
  }
}  

//通過(guò)setCron 方法修改 任務(wù)周期
@Component("myScheduled")
public class ScheduledDemo implements SchedulingConfigurer{
 //默認(rèn)的任務(wù)周期為 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("執(zhí)行任務(wù)");
  }
  
 }, 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("執(zhí)行任務(wù)");
  }
 }, 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);
 }
 } 
}