EventListener事件觸發(fā)和監(jiān)聽(tīng)器可以對(duì)代碼解耦，在一些與業(yè)務(wù)無(wú)關(guān)的，通用的操作方法，我們可以把它設(shè)計(jì)成事件監(jiān)聽(tīng)器，像通知，消息這些模塊都可以這樣設(shè)計(jì)。

事件源

@Getter
@Builder(toBuilder = true)
public class OrderEvent {
  private String msg;
}

事件處理程序

@Component
public class OrderEventListener {
  @EventListener
  public void handleOrderEvent(OrderEvent event) {
    System.out.println("我監(jiān)聽(tīng)到了handleOrderEvent發(fā)布的message為:" + event.getMsg());
  }
}

事件觸發(fā)

@Service
public class OrderService {
  @Autowired
  private ApplicationContext context;

  public void publishOrder() {
    context.publishEvent(OrderEvent.builder().msg("建立訂單").build());
  }
}

直接測(cè)試事件處理程序

@RunWith(SpringRunner.class)
@SpringBootTest
public class SecurityApplicationTests implements ApplicationContextAware {
  private ApplicationContext context = null;
  @Override
  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    this.context = applicationContext;
  }
  @Test
  public void listener() {
    context.publishEvent(OrderEvent.builder().msg("測(cè)試方法").build());
  }

測(cè)試業(yè)務(wù)代碼

由于@Service也是spring組件 ，所以它里面的事件處理程序也會(huì)被注入，這時(shí)直接注入業(yè)務(wù)對(duì)象即可

  @Autowired
  OrderService orderService;
  @Test
  public void listenerOrder() {
    orderService.publishOrder();
  }