Spring 监听事件简明使用

步骤

1. 定义事件发布器，需要实现ApplicationEventPublisherAware接口
2. 定义事件监听器，需要继承ApplicationEvent类
3. 定义响应事件，需要继承ApplicationListener<T>接口

定义事件发布器，ApplicationEventPublisherAware

@Component
public class EventDistributor implements ApplicationEventPublisherAware {

    private static ApplicationEventPublisher applicationEventPublisher;

    @Override
    public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
        EventDistributor.applicationEventPublisher = applicationEventPublisher;
    }

  /**
     * 发布同步事件
     * @param event 事件主题
     */
    public static void publishEvent(ApplicationEvent event) {
        try {
            applicationEventPublisher.publishEvent(event);
        }catch (Exception e){
            e.printStackTrace();
            System.out.println("事件发布成功，有部分执行失败");
        }
    }

    /**
     * 发布异步事件，会等待当前事务提交完成后再进行事件发布
     * @param event 事件主题
     */
    public static void publishTransactionSyncEvent(ApplicationEvent event) {
        TransactionSynchronizationManager.registerSynchronization(new TransactionSynchronizationAdapter() {
            @Override
            public void afterCommit() {
              try{
                  applicationEventPublisher.publishEvent(event);
              }catch (Exception e){
                  e.printStackTrace();
              }
            }
        });
    }
}

定义事件监听器，ApplicationEvent

public class TicketAddEvent extends ApplicationEvent {
    public TicketAddEvent(ClienteleTicketMessage userTicketMessage) {
        super(userTicketMessage);
    }

}

在需要被监听处使用：

EventDistributor.publishEvent(new TicketAddEvent(参数)); 

定义响应事件，ApplicationListener

@Component
public class TicketOverviewListener implements ApplicationListener<TicketAddEvent> {
    @Async//异步
    @Override
    public void onApplicationEvent(TicketAddEvent ticketAddEvent) {
        ClienteleTicketMessage userTicketMessage = (ClienteleTicketMessage) ticketAddEvent.getSource();//接受参数
        响应逻辑
}

监听完成