[스프링 핵심 원리 -기본편] 스프링 컨테이너와 스프링 빈

스프링 컨테이너 생성

- 빈의 이름은 항상 다른 이름을 부여해야한다.

 

컨테이너에 등록된 모든 빈 조회

public class ApplicationContextInfoTest {

    AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(AppConfig.class);

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

        }
    }
}

name = org.springframework.context.annotation.internalConfigurationAnnotationProcessor object = org.springframework.context.annotation.ConfigurationClassPostProcessor@42d236fb
name = org.springframework.context.annotation.internalAutowiredAnnotationProcessor object = org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor@60e9df3c
name = org.springframework.context.annotation.internalCommonAnnotationProcessor object = org.springframework.context.annotation.CommonAnnotationBeanPostProcessor@907f2b7
name = org.springframework.context.event.internalEventListenerProcessor object = org.springframework.context.event.EventListenerMethodProcessor@435ce306
name = org.springframework.context.event.internalEventListenerFactory object = org.springframework.context.event.DefaultEventListenerFactory@537b32ef
name = appConfig object = hello.hellospring.config.AppConfig$$SpringCGLIB$$0@7dc51783
name = memberService object = hello.hellospring.service.MemberServiceImpl@4b61d0c6
name = memberRepository object = hello.hellospring.repository.MemoryMemberRepository@6f815e7f
name = orderService object = hello.hellospring.order.OrderServiceImpl@65e7f52a
name = discountPolicy object = hello.hellospring.discount.RateDiscountPolicy@304b9f1a

애플리케이션 빈 출력하기

@Test
@DisplayName("애플리케이션 빈 출력하기")
void findApplicationBean() {
    String[] beanDefinitionNames = ac.getBeanDefinitionNames();
    for (String beanDefinationName : beanDefinitionNames) {
        BeanDefinition beanDefinition = ac.getBeanDefinition(beanDefinationName);
        if (beanDefinition.getRole() == BeanDefinition.ROLE_APPLICATION) {
            Object bean = ac.getBean(beanDefinationName);
            System.out.println("name = " + beanDefinationName + " object = " + bean);
        }

name = appConfig object = hello.hellospring.config.AppConfig$$SpringCGLIB$$0@537b32ef
name = memberService object = hello.hellospring.service.MemberServiceImpl@78f9ed3e
name = memberRepository object = hello.hellospring.repository.MemoryMemberRepository@1059754c
name = orderService object = hello.hellospring.order.OrderServiceImpl@b0964b2
name = discountPolicy object = hello.hellospring.discount.RateDiscountPolicy@48e7b3d2

스프링 빈 조회 - 기본

- ac.getBean(빈이름, 타입)

- ac.getBean(타입)

- 조회 대상 스프링 빈이 없으면 예외 발생 : NoSuchBeanDefinitionException

@Test
@DisplayName("빈 이름으로 조회")
void findBeanByName() {
    MemberService memberService = ac.getBean("memberService", MemberService.class);
    String[] beanDefinitionNames = ac.getBeanDefinitionNames();
    System.out.println("memberService = " + memberService);
    System.out.println("memberService.getClass() = " + memberService.getClass());

    Assertions.assertThat(memberService).isInstanceOf(MemberService.class)
}

memberService = hello.hellospring.service.MemberServiceImpl@42d236fb
memberService.getClass() = class hello.hellospring.service.MemberServiceImpl

스프링 빈 조회 - 동일한 타입이 둘 이상

BeanFactory와 ApplicationContext

다양한 설정 형식 지원 - 자바 코드, XML

스프링 빈 설정 메타 정보 - BeanDefinition

 

 

 

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