Spring事件監聽實現

1、代碼結構

2、pom文件引入必要jar包

<dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.3.RELEASE</version>
</dependency>

3、業務代碼

• 配置類

@Configuration
@ComponentScan("com.qing.zhao.event")
public class EventConfigration {
}

• 自定義事件類

public class MyEvent extends ApplicationEvent {
    public MyEvent(Object source, String message) {
        super(source);
        System.out.println("自定義事件:"+message+": "+source);
    }

}

• 監聽類

@Component
public class MyEventListener implements ApplicationListener<ApplicationEvent> {
    /**
     * 當容器中發佈ApplicationEvent事件時，該方法就會被觸發
     * @param applicationEvent
     */
    @Override
    public void onApplicationEvent(ApplicationEvent applicationEvent) {
        //省略相關業務處理邏輯
        if (applicationEvent instanceof MyEvent){
            System.out.println("我監聽到了自定義事件："+applicationEvent.getSource());
        }else {
            System.out.println("我監聽都了Spring默認事件"+applicationEvent.getSource());
        }
    }
}

• 事件發佈類

@Component
public class EventHandle {
    @Autowired
    private ApplicationContext applicationContext;

    public void sendEvent(String message){
        MyEvent myEvent = new MyEvent(this, message);
        applicationContext.publishEvent(myEvent);
    }
}

• 測試類

public class EventTest {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(EventConfigration.class);
        EventHandle eventHandle = applicationContext.getBean(EventHandle.class);
        eventHandle.sendEvent("傳參");
        applicationContext.close();
    }
}

4、運行結果