springboot自定义事件发布及监听

自定义线程池

@Configuration
public class MyThreadPool {//ThreadPoolTaskExecutor不会自动创建ThreadPoolExecutor，需要手动调initialize才会创建。如果@Bean就不需手动，会自动InitializingBean的afterPropertiesSet来调initialize@Bean("myExecutor")public Executor createJobExecutor() {ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();// 线程池活跃的线程数executor.setCorePoolSize(20);// 设置线程队列最大线程数executor.setMaxPoolSize(40);// 设置等待队列大小executor.setQueueCapacity(200);// 线程池维护线程所允许的空闲时间executor.setKeepAliveSeconds(60);// 线程前缀名称executor.setThreadNamePrefix("myExecutor---: ");executor.initialize();return executor;}
}

实体类

public class StudentEvent extends ApplicationEvent{private String id;private String name;public StudentEvent(Object source, String id,String name) {super(source);this.id = id;this.name = name;}
}

事件发布

sevice层


public interface StudentService {void sendStudentEvent(String id, String name);
}

serviceImpl层

@Service
public class StudentServiceImpl implements StudentService {@AutowiredApplicationEventPublisher eventPublisher;@Override@Async("myExecutor")public void sendStudentEvent(String id, String name){StudentEvent studentEvent = new StudentEvent(this,id,name);eventPublisher.publishEvent(studentEvent);}
}

事件监听

@Component
public class MyStudentEventListener {@EventListener@Async("myExecutor")public void handleStudentEvent(StudentEvent studentEvent) {// 处理事件}
}

监听器的执行顺序
如果应用程序中有多个事件监听器，可以通过@Order 注解，指定它们的执行顺序。例如：

@Component
public class MyEventListener1 {@EventListener@Order(1)public void handleEvent(MyEvent event) {// 处理事件}
}@Component
public class MyEventListener2 {@EventListener@Order(2)public void handleEvent(MyEvent event) {// 处理事件}
}

监听器的条件
只想在特定条件下才执行事件监听器,可以使用 @ConditionalOnProperty 注解：

@Component
@ConditionalOnProperty(name = "myapp.event.listener.enabled", havingValue = "true")
public class MyEventListener {@EventListenerpublic void handleEvent(MyEvent event) {// 处理事件}
}