Spring中事件监听器

实现ApplicationListener接口

@Configuration
public class A48 {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(A48.class);
        context.getBean(MyService.class).doBusiness();
        context.close();
    }
	
	// 定义任务
    static class MyEvent extends ApplicationEvent{
        public MyEvent(Object source) {
            super(source);
        }
    }
	
    @Component
    @Slf4j
    static class MyService{
        @Resource
        private ApplicationEventPublisher publisher;
        public void doBusiness(){
            log.info("主线业务");
            publisher.publishEvent(new MyEvent("myservice发送的事件"));
        }
    }
	
    @Component
    @Slf4j
    static class SmsApplicationListener implements ApplicationListener{
        @Override
        public void onApplicationEvent(MyEvent event) {
            log.info("支线任务");
        }
    }
}

@EventListener注解

@Component
@Slf4j
static class SmsApplicationListener{
    @EventListener
    public void listener(MyEvent event){
        log.info("发送短信....");
    }
}

@EventListener结合线程池异步

@Component
@Slf4j
static class SmsApplicationListener{
    @EventListener
    public void listener(MyEvent event){
        log.info("发送短信....");
    }
}
// 线程池异步发送事件
@Bean
public ThreadPoolTaskExecutor executor(){
    ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
    executor.setCorePoolSize(3);
    executor.setMaxPoolSize(10);
    executor.setQueueCapacity(100);
    return executor;
}
@Bean
public SimpleApplicationEventMulticaster applicationEventMulticaster(ThreadPoolTaskExecutor executor){
    SimpleApplicationEventMulticaster multicaster = new SimpleApplicationEventMulticaster();
    multicaster.setTaskExecutor(executor);
    return multicaster;
}

自定义listener进行解析

public static void main(String[] args) {
   AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(A48.class);
   SmsService bean = context.getBean(SmsService.class);
   for (Method method : SmsService.class.getMethods()) {
       if(method.isAnnotationPresent(MyListener.class)){
           ApplicationListener listener = new ApplicationListener() {
               @Override
               public void onApplicationEvent(ApplicationEvent event) {
                   try {
                       method.invoke(bean,event);
                   } catch (Exception e) {
                       e.printStackTrace();
                   }
               }
           };
           context.addApplicationListener(listener);
       }
   }
   context.close();
}
@Component
@Slf4j
static class SmsService{
   @MyListener
   public void listener(ApplicationEvent event){
       log.info("发送短信....");
   }
}