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import org.springframework.boot.context.event.ApplicationStartedEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.lang.NonNull;

/**
 * @author itning
 * @date 2020/4/29 16:59
 */
public class FirstListener implements ApplicationListener<ApplicationStartedEvent> {
    @Override
    public void onApplicationEvent(@NonNull ApplicationStartedEvent event) {
        System.out.println("FirstListener");
    }
}

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import org.springframework.context.ApplicationContextInitializer;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.annotation.Order;
import org.springframework.lang.NonNull;

/**
 * @author itning
 * @date 2020/4/28 20:43
 */
@Order(1)
public class FirstApplicationContextInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {
    @Override
    public void initialize(@NonNull ConfigurableApplicationContext applicationContext) {
        System.out.println("FirstApplicationContextInitializer");
    }
}