springboot 系统事件监听

springboot的事件在org.springframework.boot.context.event包下，可通过GenericApplicationListener监听。 springboot的LoggingApplicationListener集成此接口实现。

可以参考此设计来实现我们自己的一些系统配置的自定义业务。 事件如下：

GenericApplicationListener

public interface GenericApplicationListener extends ApplicationListener<ApplicationEvent>, Ordered{ }

GenericApplicationListener可用来监听springboot的以下事件（按照先后顺序）：

ApplicationContextInitializedEvent

事件发布时机：springApplicaiton开始启动，ApplicationContextInitializers被调用，但是bean还没有被加载。

ApplicationPreparedEventContextRefreshedEventApplicationStartedEvent

事件发布时机：applicationContext已更新但是还没有调用ApplicationRunner/ConmandLineRunnder

AvailabilityChangeEventApplicationReadyEvent

事件发布时机：服务启动成功。

ContextClosedEvent

使用：

创建Listener继承GenericApplicationListener public class TestRunListener implements GenericApplicationListener { public static final int DEFAULT_ORDER = Ordered.HIGHEST_PRECEDENCE + 100; private static final Logger logger = LoggerFactory.getLogger(TestRunListener.class); SpringApplication application = null; String[] args = null; @Override public boolean supportsEventType(ResolvableType eventType) { logger.info("eventType:{}",eventType.toString()); return true; } @Override public int getOrder() { return DEFAULT_ORDER; } @Override public void onApplicationEvent(ApplicationEvent event) { logger.info("TestRun,eventType is:{}",event.toString()); } }

2, 注册到application

@SpringBootApplication public class LogTestApplication { private static final Logger logger = LoggerFactory.getLogger(LogTestApplication.class); public static void main(String[] args) { SpringApplication application = new SpringApplication(LogTestApplication.class); application.addListeners(new TestRunListener()); application.run(args); } }