如何在Spring Boot的main方法中创建仓库实例？

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

@SpringBootApplication
public class MyApp {
    public static void main(String[] args) {
        SpringApplication.run(MyApp.class, args);
    }
}

public interface UserRepository extends JpaRepository<User, Long> {
    // 可以在这里定义自定义的查询方法
}

@Service
public class UserService {
    private final UserRepository userRepository;

    @Autowired
    public UserService(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    // 可以在这里使用userRepository进行数据库操作
}