SpringBoot监听应用程序启动的生命周期事件的四种方法

import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;

@Component
public class ApplicationStartupListener implements ApplicationListener<ApplicationReadyEvent> {

    @Override
    public void onApplicationEvent(ApplicationReadyEvent event) {
        System.out.println("Application is ready!");
        // Your custom logic here
    }
}

import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.context.event.EventListener;
import org.springframework.stereotype.Component;

@Component
public class ApplicationStartupListener {

    @EventListener
    public void handleApplicationReady(ApplicationReadyEvent event) {
        System.out.println("Application is ready!");
        // Your custom logic here
    }
}

import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;

@Component
public class MyCommandLineRunner implements CommandLineRunner {

    @Override
    public void run(String... args) throws Exception {
        System.out.println("Application has started!");
        // Your custom logic here
    }
}

import org.springframework.context.SmartLifecycle;
import org.springframework.stereotype.Component;

@Component
public class MySmartLifecycle implements SmartLifecycle {

    private boolean running = false;

    @Override
    public void start() {
        System.out.println("Starting MySmartLifecycle");
        running = true;
        // Your custom logic here
    }

    @Override
    public void stop() {
        System.out.println("Stopping MySmartLifecycle");
        running = false;
        // Your custom logic here
    }

    @Override
    public boolean isRunning() {
        return running;
    }

    @Override
    public int getPhase() {
        return 0;
    }

    @Override
    public boolean isAutoStartup() {
        return true;
    }

    @Override
    public void stop(Runnable callback) {
        stop();
        callback.run();
    }
}