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@SpringBootApplication
public class Demo15Application {
    public static void main(String[] args) {
        ApplicationContext run = SpringApplication.run(Demo15Application.class, args);
        Teacher bean = run.getBean(Teacher.class);
        System.out.println(bean);
    }
    //在运行时执行
    @Bean
    CommandLineRunner cmd(CompanyMapper companyMapper){
        return args -> {
            List<Company> companies = companyMapper.selectList(null);
            for (Company company:companies){
                System.out.println(company);
            }
        };
    }
}