方式一：

//返回Spring容器對(duì)象
       ConfigurableApplicationContext context = SpringApplication.run(Application.class, args);
       UserService userService = (UserService) context.getBean("userServiceImpl");
       String hi = userService.sayHi("spring boot java");
       System.out.println(hi);

方式二：

1、實(shí)現(xiàn)CommandLineRunner接口

public class Application implements CommandLineRunner {

2、啟動(dòng)Spring容器

public static void main(String[] args) {
        //啟動(dòng)SpringBoot，啟動(dòng)Spring容器
        SpringApplication.run(Application.class, args);
    }

3、注入U(xiǎn)serService的Bean

 @Autowired
    private UserService userService;

4、實(shí)現(xiàn)接口方法

 //相當(dāng)于純Java程序的main方法
    @Override
    public void run(String... args) throws Exception {
        String hi = userService.sayHi("springboot java");
        System.out.println(hi);
    }

關(guān)閉SpringBoot圖標(biāo)logo

public static void main(String[] args) {
        SpringApplication springApplication = new SpringApplication(Application.class);
        springApplication.setBannerMode(Banner.Mode.OFF);
        springApplication.run(args);
    }