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。

@Datapublic 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;    }}

@Componentpublic 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。