【SpringBoot3】Spring Boot Event 自定义事件的发布与监听

import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.event.EventListener;
import org.springframework.stereotype.Component;
 
// 自定义事件
class CustomEvent extends ApplicationEvent {
    public CustomEvent(Object source) {
        super(source);
    }
}
 
// 自定义事件监听器
@Component
class CustomEventListener {
 
    @EventListener
    public void onCustomEvent(CustomEvent event) {
        // 处理事件逻辑
        System.out.println("Custom event received: " + event.getSource());
    }
}
 
// 事件发布者
@Component
class EventPublisher {
 
    private final ApplicationEventPublisher publisher;
 
    public EventPublisher(ApplicationEventPublisher publisher) {
        this.publisher = publisher;
    }
 
    public void publish() {
        CustomEvent event = new CustomEvent("Hello, World!");
        publisher.publishEvent(event);
    }
}

这个代码示例展示了如何在Spring Boot应用中创建和发布自定义事件，以及如何编写一个监听器来处理这些事件。CustomEvent类继承自ApplicationEvent，用于封装事件的数据。CustomEventListener类中的onCustomEvent方法通过@EventListener注解标记为事件监听器，并处理接收到的自定义事件。EventPublisher组件使用ApplicationEventPublisher发布CustomEvent事件。