🌱 스프링 빈 조회 - 기본 / 동일한 타입이 둘 이상

1. 기본 

ac.getBean(빈이름, 타입)  /   ac.getBean(타입)

 

import hello.AppConfig;
import hello.core.member.MemberService;
import hello.core.member.MemberServiceImpl;
import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import static org.assertj.core.api.Assertions.assertThat;


public class ApplicationContextBasicFindTest {

    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);

    }

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

    @Test
    @DisplayName("빈 이름으로 조회 안됨 테스트")
    void notFindBeanByName(){
        org.junit.jupiter.api.Assertions.assertThrows(NoSuchBeanDefinitionException.class,()->ac.getBean("안만듦",MemberService.class));
    }
}

 

2. 동일한 타입이 둘 이상

 

이름으로 조회했을 때는 상관없으나, 타입으로만 조회하면 오류가 발생!

이름을 다르게 지정해서 이름으로 조회하자.

package hello.core.beanfind;


import hello.core.member.MemberRepository;
import hello.core.member.MemoryMemberRepository;

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.NoUniqueBeanDefinitionException;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Map;

import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.jupiter.api.Assertions.assertThrows;

public class ApplicationContextSameBean {

    AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(sameBeanConfig.class);

    @Configuration
    static class sameBeanConfig{
        @Bean
        public MemberRepository memberRepository1(){
            return new MemoryMemberRepository();
        }

        @Bean
        public MemberRepository memberRepository2(){
            return new MemoryMemberRepository();
        }

    }


    @Test
    @DisplayName("타입으로만 조회 시 오류 발생")
    void findByType(){
        assertThrows(NoUniqueBeanDefinitionException.class,()->ac.getBean(MemberRepository.class));
    }

    @Test
    @DisplayName("빈 이름으로 조회")
    void findByName(){
        MemberRepository memberRepository = ac.getBean("memberRepository1",MemberRepository.class);
        assertThat(memberRepository).isInstanceOf(MemberRepository.class);
    }

    @Test
    @DisplayName("모두 조회")
    void findAll(){
        Map<String,MemberRepository> beansOfType=ac.getBeansOfType(MemberRepository.class);
        for(String key : beansOfType.keySet()){
            System.out.println("key = " + key +"value" + beansOfType.get(key));
        }

        assertThat(beansOfType.size()).isEqualTo(2);
    }

}

이름 / 리턴값주소 로 반환 해줌