Spring知识点回顾（07）事件发布和监听
1、DemoEvent extends ApplicationEvent {
public DemoEvent(Object source, String msg){
super(source);
this.msg = msg;
}
}
2、DemoListener implements ApplicationEventListener<DemoEvent> {
public void onApplicationEvent(DemoEvent event){
}
}
3、DemoPublisher {
public void publish（）{
applicationContext.publishEvent( new DemoEvent(this, msg) );
}
}