详解SpringBoot加载应用事件监听器

@Order(Ordered.HIGHEST_PRECEDENCE)
public class HelloWorldApplicationListener implements ApplicationListener<ContextRefreshedEvent> {
  @Override
  public void onApplicationEvent(ContextRefreshedEvent event) {
    System.out.println("HelloWorld : " + event.getApplicationContext().getId()
        + " , timestamp : " + event.getTimestamp());
  }
}

public class AfterHelloWorldApplicationListener implements ApplicationListener<ContextRefreshedEvent>,Ordered {
  @Override
  public void onApplicationEvent(ContextRefreshedEvent event) {
    System.out.println("AfterHelloWorld : " + event.getApplicationContext().getId()
        + " , timestamp : " + event.getTimestamp());
  }
  @Override
  public int getOrder() {
    return Ordered.LOWEST_PRECEDENCE;
  }
}