以下是一个使用Spring Boot实现DDD领域事件的案例：
1. 首先，创建一个领域事件类`OrderCreatedEvent`：
public class OrderCreatedEvent { private Order order; public OrderCreatedEvent(Order order) { this.order = order; } public Order getOrder() { return order; } }
2. 创建一个领域事件监听器接口`OrderCreatedListener`：
public interface OrderCreatedListener { void onOrderCreated(OrderCreatedEvent event); }
3. 创建一个领域事件发布者`OrderEventPublisher`：
importorg.springframework.context.ApplicationEventPublisher; importorg.springframework.stereotype.Component; publicclassOrderEventPublisher { privatefinalApplicationEventPublisherapplicationEventPublisher; publicOrderEventPublisher(ApplicationEventPublisherapplicationEventPublisher) { this.applicationEventPublisher=applicationEventPublisher; } publicvoidpublishOrderCreatedEvent(Orderorder) { OrderCreatedEventevent=newOrderCreatedEvent(order); applicationEventPublisher.publishEvent(event); } }
4. 创建一个订单服务类`OrderService`，并在其中处理领域事件：
importorg.springframework.beans.factory.annotation.Autowired; importorg.springframework.stereotype.Service; publicclassOrderService { privatefinalOrderEventPublisherorderEventPublisher; publicOrderService(OrderEventPublisherorderEventPublisher) { this.orderEventPublisher=orderEventPublisher; } publicvoidcreateOrder(Orderorder) { // 业务逻辑，创建订单等操作...// ...// 发布领域事件orderEventPublisher.publishOrderCreatedEvent(order); } }
5. 创建一个订单控制器类`OrderController`，并接收领域事件：
```javaimportorg.springframework.beans.factory.annotation.Autowired; importorg.springframework.web.bind.annotation.PostMapping; importorg.springframework.web.bind.annotation.RequestBody; importorg.springframework.web.bind.annotation.RestController; importreactor.core.publisher.Mono; publicclassOrderController { privatefinalOrderServiceorderService; privatefinalOrderCreatedListenerlistener; // 注入领域事件监听器实例publicOrderController(OrderServiceorderService, OrderCreatedListenerlistener) { this.orderService=orderService; this.listener=listener; // 将监听器实例注入到控制器中，以便在领域事件发生
