ApplicationListener接口实践

通过之前的学习，我们了解到ApplicationListener接口在spring事件广播中能够将消息广播到需要的监听器中。那么就让我们手撸一个监听器来试试。看看效果。

@Data
public class MyApplicationEvent extends ApplicationEvent {private String age;private String name;/*** Create a new ApplicationEvent.** @param source the object on which the event initially occurred (never {@code null})*/public MyApplicationEvent(Object source,String age,String name) {super(source);this.age=age;this.name=name;}
}

@Component
public class MyApplicationListener implements ApplicationListener {/**** 监听事件* @param event*/@Overridepublic void onApplicationEvent(ApplicationEvent event) {System.out.println("myApplication....");if (event instanceof MyApplicationEvent){System.out.println("myapplicationEvent...");System.out.println(event.toString());}}
}

@RestController
@RequestMapping("/file")
public class FileController  implements ApplicationContextAware {private static ApplicationContext context;@GetMapping(value = "/test")public void test(){MyApplicationEvent myApplicationEvent=new MyApplicationEvent("test","123","tjl");context.publishEvent(myApplicationEvent);}@Overridepublic void setApplicationContext(ApplicationContext applicationContext) throws BeansException {this.context=applicationContext;}
}

注释：上述打印的结果中，最后两个输出是容器事件。

总结：在做广播的时候要首先明确广播事件，定义好广播事件之后再定义广播监听器。然后在广播监听器中对广播事件进行处理。在发送广播的时候用IOC容器的pushEvent方法。在注入content的时候，可以通过ApplicationContentAware接口来实现。