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
     */
    @Override
    public 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);
    }

    @Override
    public 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。