SpringBoot下使用定时任务的方式全揭秘(6种)

  public static void main(String[] args){
    //定时任务间隔时间
    int sleepTime=2*1000;
    new Thread(new Runnable() {
      @Override
      public void run() {
        while (true){
          try {
            System.out.println("Thread方式执行一次定时任务");
            //线程休眠规定时间
            Thread.sleep(sleepTime);
          } catch (InterruptedException e) {
            e.printStackTrace();
          }
        }
      }
    }).start();
  }

  public static void main(String[] args){
    int sleepTime=2*1000;
    TimerTask timerTask = new TimerTask() {
      @Override
      public void run() {
        System.out.println("Timer方式执行一次定时任务");
      }
    };
    new Timer().schedule(timerTask,1,sleepTime);
  }

  public static void main(String[] args){
    int sleepTime=2*1000;
    ScheduledExecutorService scheduledExecutor = Executors.newSingleThreadScheduledExecutor();
    scheduledExecutor.scheduleAtFixedRate(
        new Runnable() {
          @Override
          public void run() {
            System.out.println("ScheduledExecutorService方式执行一次定时任务");
          }
        }
    ,1,sleepTime, TimeUnit.SECONDS);
  }

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-quartz</artifactId>
</dependency>

@Configuration
public class QuartzConfig {
  @Bean
  public JobDetail quartzDetail(){
    return JobBuilder.newJob(QuartzTest.class).withIdentity("QuartzTest").storeDurably().build();
  }
  @Bean
  public SimpleTrigger quartzTrigger(){
    SimpleScheduleBuilder scheduleBuilder = SimpleScheduleBuilder.simpleSchedule()
        .withIntervalInSeconds(10)
        .repeatForever();
    return TriggerBuilder.newTrigger().forJob(quartzDetail())
        .withIdentity("QuartzTest")
        .withSchedule(scheduleBuilder)
        .build();
  }
}

public class QuartzTest extends QuartzJobBean {
  @Override
  protected void executeInternal(JobExecutionContext jobExecutionContext){
    System.out.println("quartz执行一次定时任务 ");
  }
}

@Target({ElementType.METHOD, ElementType.ANNOTATION_TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Repeatable(Schedules.class)
public @interface Scheduled {
//cron表达式
  String cron() default "";
//接收一个java.util.TimeZone#ID。
  String zone() default "";
//上一次执行完毕时间点之后多长时间再执行
  long fixedDelay() default -1;
//支持占位符形式的字符串类型的fixedDelay
  String fixedDelayString() default "";
//上一次开始执行时间点之后多长时间再执行
  long fixedRate() default -1;
//支持占位符形式的字符串类型的fixedRateString
  String fixedRateString() default "";
//第一次延迟多长时间后再执行  
  long initialDelay() default -1;
//支持占位符形式的字符串类型的initialDelay
  String initialDelayString() default "";
}

@SpringBootApplication
/**
 * 开启定时任务支持
 */
@EnableScheduling
public class TestApplication extends SpringBootServletInitializer {
  public static void main(String[] args) {
    SpringApplication.run(TestApplication.class, args);
  }
  @Override
  protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
    return builder.sources(this.getClass());
  }
}

@Component
public class ScheduledTest {
  private Logger logger = LoggerFactory.getLogger(ScheduledTest.class);
  /**
   * 每15秒执行一次定时任务
   */
  @Scheduled(cron = "0/15 * * * * ? ")
  public void testCron(){
    logger.info("Scheduled 执行一次定时任务");
  }
}