通过CommandLineRunner接口，可以实现在Spring Boot完全启动后执行一些代码逻辑，本文将执行的逻辑是打印所有Bean的信息；
1) 通过 ApplicationContext.getBeanDefinitionNames() 方法获取所有Bean的名称；
2) 通过 ApplicationContext.getBean(beanName)获取Bean的详细信息；
public class BootdemoApplication implements CommandLineRunner {
public static void main(String[] args) {
SpringApplication.run(BootdemoApplication.class, args);
/*SpringApplication application = new SpringApplication(BootdemoApplication.class);
//关闭banner条显示
application.setBannerMode(Banner.Mode.OFF);
application.run(args);*/
}
@Autowired
private ApplicationContext applicationContext;
@Override
public void run(String... args) throws Exception
{
String[] beans = applicationContext.getBeanDefinitionNames();
Arrays.sort(beans);
for (String bean : beans)
{
System.out.println("bean id："+bean+"，bean类型：" + applicationContext.getBean(bean).getClass());
}
}
}
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