https://www.cnblogs.com/fdzfd/p/7872909.html
*****************************************************
一：Application 事件
（1）ApplicationStartingEvent
An ApplicationStartingEvent is sent at the start of a run, but before any processing except the registration of listeners and initializers.
（2）ApplicationEnvironmentPreparedEvent
An ApplicationEnvironmentPreparedEvent is sent when the Environment to be used in the context is known, but before the context is created.
示例：
public class MyListener implements ApplicationListener<ApplicationEnvironmentPreparedEvent> { @Override public void onApplicationEvent(ApplicationEnvironmentPreparedEvent event) { SpringApplication app = event.getSpringApplication(); // app.setBannerMode(Banner.Mode.OFF); System.out.println("#####MyListener found!#####"); } }
Application类中添加
@SpringBootApplication public class Application { public static void main(String[] args){ SpringApplication app = new SpringApplication(Application.class); app.addListeners(new MyListener()); app.run(args); } }
运行结果：
（3）ApplicationPreparedEvent
An ApplicationPreparedEvent is sent just before the refresh is started, but after bean definitions have been loaded.
（4）ApplicationReadyEvent
An ApplicationReadyEvent is sent after the refresh and any related callbacks have been processed to indicate the application is ready to service requests.
当Application启动好后调用
示例：
public class MyListener implements ApplicationListener<ApplicationReadyEvent> { @Override public void onApplicationEvent(ApplicationReadyEvent event) { System.out.println("#####MyListener found!#####"); } }
运行结果位置：
（5）ApplicationFailedEvent
An ApplicationFailedEvent is sent if there is an exception on startup.
这里举了两种事件的例子，其他3种事件可以通过改写MyListener中参数调试。