SpringBoot - 事件机制使用详解（ApplicationEvent、ApplicationListener）

import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.event.ContextRefreshedEvent;
 
// 自定义事件
public class MyCustomEvent extends ApplicationEvent {
    public MyCustomEvent(Object source) {
        super(source);
    }
}
 
// 自定义监听器
@Configuration
public class MyCustomListener implements ApplicationListener<MyCustomEvent> {
    @Override
    public void onApplicationEvent(MyCustomEvent event) {
        // 处理事件逻辑
        System.out.println("MyCustomListener received MyCustomEvent: " + event);
    }
}
 
// 触发事件的地方
@Configuration
public class EventPublisher {
    
    private final ApplicationEventPublisher publisher;
 
    public EventPublisher(ApplicationEventPublisher publisher) {
        this.publisher = publisher;
    }
 
    public void publish() {
        MyCustomEvent event = new MyCustomEvent(this);
        publisher.publishEvent(event);
    }
}
 
// 在SpringBoot启动完成后发布事件
@Configuration
public class StartupListener implements ApplicationListener<ContextRefreshedEvent> {
    private final EventPublisher eventPublisher;
 
    public StartupListener(EventPublisher eventPublisher) {
        this.eventPublisher = eventPublisher;
    }
 
    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        if (event.getApplicationContext().getParent() == null) {
            // 发布事件
            eventPublisher.publish();
        }
    }
}

这个代码示例展示了如何在SpringBoot应用中定义、监听和发布自定义事件。MyCustomEvent是一个自定义事件类，MyCustomListener是监听该事件的监听器。EventPublisher类中的publish方法用于发布事件，而StartupListener则在SpringBoot启动完成后发布事件。这个例子有助于理解Spring的事件机制，并在实际应用中进行事件驱动的开发。