配置在META-INF/spring.factories **ApplicationContextInitializer** ```java public class HelloApplicationContextInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> { @Override public void initialize(ConfigurableApplicationContext applicationContext) { System.out.println("ApplicationContextInitializer...initialize..."+applicationContext); } } ``` **SpringApplicationRunListener** ```java public class HelloSpringApplicationRunListener implements SpringApplicationRunListener { //必须有的构造器 public HelloSpringApplicationRunListener(SpringApplication application, String[] args){ } @Override public void starting() { System.out.println("SpringApplicationRunListener...starting..."); } @Override public void environmentPrepared(ConfigurableEnvironment environment) { Object o = environment.getSystemProperties().get("os.name"); System.out.println("SpringApplicationRunListener...environmentPrepared.."+o); } @Override public void contextPrepared(ConfigurableApplicationContext context) { System.out.println("SpringApplicationRunListener...contextPrepared..."); } @Override public void contextLoaded(ConfigurableApplicationContext context) { System.out.println("SpringApplicationRunListener...contextLoaded..."); } @Override public void finished(ConfigurableApplicationContext context, Throwable exception) { System.out.println("SpringApplicationRunListener...finished..."); } } ``` 配置（META-INF/spring.factories） ```properties org.springframework.context.ApplicationContextInitializer=\ com.atguigu.springboot.listener.HelloApplicationContextInitializer org.springframework.boot.SpringApplicationRunListener=\ com.atguigu.springboot.listener.HelloSpringApplicationRunListener ``` 只需要放在ioc容器中 **ApplicationRunner** ```java @Component public class HelloApplicationRunner implements ApplicationRunner { @Override public void run(ApplicationArguments args) throws Exception { System.out.println("ApplicationRunner...run...."); } } ``` **CommandLineRunner** ```java @Component public class HelloCommandLineRunner implements CommandLineRunner { @Override public void run(String... args) throws Exception { System.out.println("CommandLineRunner...run..."+ Arrays.asList(args)); } } ```