08.Spring 应用之 Event

代码已经上传至 https://github.com/masteryourself/study-spring.git ，分支是 master，工程是 study-spring-framework

1. Event

1.1 ApplicationListener

监听容器中发布的事件，事件驱动模型开发
监听 ApplicationEvent 及其子类的事件

1.2 @EventListener

可以使用注解简化开发，原理是通过 EventListenerMethodProcessor 处理器解析方法上的 @EventListener 注解

2. 代码

1. MyAnnotationListener

@Component
public class MyAnnotationListener {

	@EventListener(classes = {ApplicationEvent.class})
	public void applicationEventListen(ApplicationEvent event) {
		System.out.println("MyAnnotationListener 接收到事件：" + event.getClass());
	}

}

2. MyApplicationListener

@Component
public class MyApplicationListener implements ApplicationListener<ApplicationEvent> {

	@Override
	public void onApplicationEvent(ApplicationEvent event) {
		System.out.println("MyApplicationListener 接收到事件：" + event.getClass());
	}

}

3. SpringConfig

@Configuration
@ComponentScan
public class SpringConfig {
}

4. EventTest

public class EventTest {

    public static void main(String[] args) {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(SpringConfig.class);
        context.publishEvent(new ApplicationEvent("hello spring annotation") {
        });
        context.close();
        // MyAnnotationListener 接收到事件：class org.springframework.context.event.ContextRefreshedEvent
        // MyApplicationListener 接收到事件：class org.springframework.context.event.ContextRefreshedEvent
        // MyAnnotationListener 接收到事件：class pers.masteryourself.study.spring.framework.event.EventTest$1
        // MyApplicationListener 接收到事件：class pers.masteryourself.study.spring.framework.event.EventTest$1
        // MyAnnotationListener 接收到事件：class org.springframework.context.event.ContextClosedEvent
        // MyApplicationListener 接收到事件：class org.springframework.context.event.ContextClosedEvent
    }

}

来源：CSDN

作者：masteryourself

链接：https://blog.csdn.net/masteryourself/article/details/104269114

标签

事件驱动

spring原理