java定时任务实现的4种方式小结

 Timer timer = new Timer();
    timer.schedule(new TimerTask() {
      @Override
      public void run() {
        System.out.println("Time's up!");
 
      }
    },3*1000,1000);

 ScheduledExecutorService scheduledThreadPool = Executors.newScheduledThreadPool(2);
    scheduledThreadPool.scheduleAtFixedRate(new Runnable() {
      @Override
      public void run() {
        System.out.println("=========================");
      }
    }, 1000, 2000, TimeUnit.MILLISECONDS);
 
    scheduledThreadPool.scheduleAtFixedRate(new Runnable() {
      @Override
      public void run() {
        System.out.println(System.currentTimeMillis()+"<><>"+System.nanoTime());
      }
    }, 1000, 2000, TimeUnit.MILLISECONDS);

@Component
public class SpringScheduled {
 
  @Scheduled(initialDelay = 2000,fixedDelay = 5000)
  public void doSomething() {
    System.out.println("Spring自带的Scheduled执行了=======================");
  }
} 
//下面是开启
@SpringBootApplication
@EnableScheduling
public class DemoApplication {
 
  public static void main(String[] args) throws InterruptedException {
    SpringApplication application = new SpringApplication(DemoApplication.class);
    application.addListeners(new ContextRefreshedEventListener());
    application.run(args);
  }
}

@Configuration
public class QuartzConfig { 
 
  @Resource
  private ScheduleTask scheduleTask;
 
  /**
   * 配置定时任务1
   * @return
   */
  @Bean(name="firstJobDetail")
  public MethodInvokingJobDetailFactoryBean firstJobDetail(){
    MethodInvokingJobDetailFactoryBean method = new MethodInvokingJobDetailFactoryBean();
    // 为需要执行的实体类对应的对象
    method.setTargetObject(scheduleTask);
    // 需要执行的方法
    method.setTargetMethod("test");
    // 是否并发执行
    method.setConcurrent(false);
    return method;
  } 
 
  /**
   *  配置触发器1
   *  @param firstJobDetail
   *  @return
   */
  @Bean(name="firstTrigger")
  public SimpleTriggerFactoryBean firstTrigger(JobDetail firstJobDetail){
    SimpleTriggerFactoryBean simpleBean = new SimpleTriggerFactoryBean();
    simpleBean.setJobDetail(firstJobDetail);
    // 设置任务启动延迟
    simpleBean.setStartDelay(1000);
    // 每1秒执行一次
    simpleBean.setRepeatInterval(1000);
    //设置重复计数
    //simpleBean.setRepeatCount(0);
    return simpleBean;
  }
 
  /**
   * 配置Scheduler
   */
  @Bean(name = "scheduler")
  public SchedulerFactoryBean schedulerFactoryBean(Trigger firstTrigger){
    SchedulerFactoryBean factoryBean = new SchedulerFactoryBean();
    factoryBean.setTriggers(firstTrigger);
    return factoryBean;
  } 
}

@Component
public class ScheduleTask {
 
  public void test() {
    System.out.println("====================================");
  }
 
}

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
  </dependency>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
  </dependency>
   <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-devtools</artifactId>
    <optional>true</optional>
  </dependency>

@Component
public class TimingTask {
 private static final SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");  
  @Scheduled(cron="*/6 * * * * ?")  
  private void process(){
  System.out.println("this is scheduler task runing "+new Date());
  }
  @Scheduled(fixedRate = 6000)
  public void reportCurrentTime() {
    System.out.println("现在时间：" + dateFormat.format(new Date()));
  }
}

@SpringBootApplication(exclude = MongoAutoConfiguration.class)
@EnableScheduling
public class DemoApplication {
 public static void main(String[] args) {
 SpringApplication.run(DemoApplication.class, args);
 }
 
}

this is scheduler task runing Thu Jul 18 10:59:06 CST 2019
现在时间：10:59:10
this is scheduler task runing Thu Jul 18 10:59:12 CST 2019
现在时间：10:59:16
this is scheduler task runing Thu Jul 18 10:59:18 CST 2019
现在时间：10:59:22
this is scheduler task runing Thu Jul 18 10:59:24 CST 2019
现在时间：10:59:28

@RestController
@RequestMapping("/time")
public class DynamicScheduledTask {
 private static String DEFAULT_CRON = "0/5 * * * * ?";
 @Autowired
  private ThreadPoolTaskScheduler threadPoolTaskScheduler;
  private ScheduledFuture<?> future;
  @Bean
  public ThreadPoolTaskScheduler threadPoolTaskScheduler() {
    return new ThreadPoolTaskScheduler();
  }
  @RequestMapping("/{id}/startCron")
  public String startCron(@PathVariable("id") String id) {
    future = threadPoolTaskScheduler.schedule(new MyRunnable(), new CronTrigger(DEFAULT_CRON));
    System.out.println("DynamicTask.startCron()"+"------"+id);
    return "startCron";
  }
  @RequestMapping("/{id}/stopCron")
  public String stopCron(@PathVariable("id") String id) {
    if (future != null) {
      future.cancel(true);
    }
    System.out.println("DynamicTask.stopCron()"+"------"+id);
    return "stopCron";
  }
  @RequestMapping("/{id}/changeCron10")
  public String startCron10(@PathVariable("id") String id) {
    stopCron(id);// 先停止，在开启.
    future = threadPoolTaskScheduler.schedule(new MyRunnable(), new CronTrigger("*/10 * * * * *"));
    System.out.println("DynamicTask.startCron10()"+"------"+id);
    return "changeCron10";
  }
  private class MyRunnable implements Runnable {
    @Override
    public void run() {
      System.out.println("DynamicTask.MyRunnable.run()，" + new Date());
    }
   }
}