1. 实现 listener 接口
@Component
public class AppReadyListener implements ApplicationListener<ApplicationReadyEvent> {
@Override
public void onApplicationEvent(ApplicationReadyEvent applicationReadyEvent) {
// System.out.println("ApplicationReadyEvent");
}
}
2. Application 添加监听器
public class ApiApplication {
public static void main(String[] args) {
SpringApplication app = new SpringApplication(ApiApplication.class);
app.addListeners(new AppReadyListener());
app.run(args);
}
}
3. 其他可实现的 listener
/**
* https://docs.spring.io/spring-boot/docs/2.3.0.RELEASE/reference/html/spring-boot-features.html#boot-features-application-events-and-listeners
*
* 1 An ApplicationStartingEvent is sent at the start of a run but before any processing, except for the registration of listeners and initializers.
*
* 2 An ApplicationEnvironmentPreparedEvent is sent when the Environment to be used in the context is known but before the context is created.
*
* 3 An ApplicationContextInitializedEvent is sent when the ApplicationContext is prepared and ApplicationContextInitializers have been called but before any bean definitions are loaded.
*
* 4 An ApplicationPreparedEvent is sent just before the refresh is started but after bean definitions have been loaded.
*
* 5 An ApplicationStartedEvent is sent after the context has been refreshed but before any application and command-line runners have been called.
*
* 6 An AvailabilityChangeEvent is sent right after with LivenessState.CORRECT to indicate that the application is considered as live.
*
* 7 An ApplicationReadyEvent is sent after any application and command-line runners have been called.
*
* 8 An LivenessState is sent right after with ReadinessState.ACCEPTING_TRAFFIC to indicate that the application is ready to service requests.
*
* 9 An ApplicationFailedEvent is sent if there is an exception on startup.
*
*
*
*/
