스프링빈 조회

*모든 빈 출력하기

AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(AppConfig.class);

@Test
    @DisplayName("모든 빈 출력하기")
    void findAllBean() {
        String[] beanDefinitionNames = ac.getBeanDefinitionNames();
        for(String beanDefinitionName : beanDefinitionNames){
            Object bean = ac.getBean(beanDefinitionName);
            System.out.println("name = " + beanDefinitionName + " object = " + bean);
        }
    }

 

 

*애플리케이션 빈만 출력하기

AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(AppConfig.class);

@Test
    @DisplayName("애플리케이션 빈 출력하기")
    void findApplicationBean() {
        String[] beanDefinitionNames = ac.getBeanDefinitionNames();
        for(String beanDefinitionName : beanDefinitionNames){
            BeanDefinition beanDefinition = ac.getBeanDefinition(beanDefinitionName);

            if(beanDefinition.getRole() == BeanDefinition.ROLE_APPLICATION){
                Object bean = ac.getBean(beanDefinitionName);
                System.out.println("name = " + beanDefinitionName + " object = " + bean);
            }
        }
    }

 

*빈 이름으로 조회

AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(AppConfig.class);

@Test
    @DisplayName("빈 이름으로 조회")
    void findBeanByName() {
        MemberService memberService = ac.getBean("memberService", MemberService.class);
        assertThat(memberService).isInstanceOf(MemberServiceImpl.class);
    }

 

*이름 없이 타입으로만 조회

AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(AppConfig.class);

@Test
    @DisplayName("이름 없이 타입으로만 조회")
    void findBeanByType() {
        MemberService memberService = ac.getBean(MemberService.class);
        assertThat(memberService).isInstanceOf(MemberServiceImpl.class);
    }

 

*빈 이름으로 조회안되는 예외상황

AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(AppConfig.class);

@Test
    @DisplayName("빈 이름으로 조회X")
    void findBeanByNameX() {
        MemberService xxxx = ac.getBean("xxxx", MemberService.class);
        assertThrows(NoSuchBeanDefinitionException.class, () -> ac.getBean("xxxx", MemberService.class));
    }