11장 어노테이션을 이용한 빈 설정

스프링 프레임워크 기초 공부 2020. 4. 30. 17:25

@Required

spring 5.1버전부터 사용되지 않는 어노테이션이라 뭔지 알기만 하고 넘어가겠다.

@Aurowired

1)자동 주입 메소드

package kr.co.softcampus.beans;

public class DataBean1 {

}

DataBean1 생성

package kr.co.softcampus.beans;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Required;

public class TestBean1 {
	private int data1;
	private DataBean1 data2;
    
        public int getData1() {
		return data1;
	}
	public void setData1(int data1) {
		this.data1 = data1;
	}
	public DataBean1 getData2() {
		return data2;
	}
	
	
	//자동 주입(타입):매개변수 타입이 DataBean1이라고 정의되어있기때문에 DataBean1 타입으로 정의되어있는 bean객체를 찾아서 자동 주입해줌(DataBean1 타입이 정의되어 있지 않으면 오류발생)
	@Autowired
	public void setData2(DataBean1 data2) {
		this.data2 = data2;
	}
	
	
    
 }

TestBean1 생성

package kr.co.softcampus.config;

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

import kr.co.softcampus.beans.DataBean1;
import kr.co.softcampus.beans.TestBean1;

@Configuration
public class BeanConfigClass {
	@Bean
	public TestBean1 java1() {
		return new TestBean1();
	}
	
	@Bean
	public DataBean1 data_bean1() {//DataBean1 타입으로 만든 bean생성 자동주입가능~!
		return new DataBean1();
	}
	
	
}

BeanConfigClass(java) 생성

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
						http://www.springframework.org/schema/beans/spring-beans.xsd
						http://www.springframework.org/schema/context
						http://www.springframework.org/schema/context/spring-context.xsd">
						
	<!-- bean 클래스에 설정되어 있는 어노테이션을 이용한다. -->
	<context:annotation-config/>
	
	<bean id='xml1' class='kr.co.softcampus.beans.TestBean1'/>
	<bean class='kr.co.softcampus.beans.DataBean1'/>DataBean1타입 bean 생성
    
    </beans>

xml파일 생성

package kr.co.softcampus.main;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import kr.co.softcampus.beans.TestBean1;
import kr.co.softcampus.config.BeanConfigClass;

public class MainClass {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ClassPathXmlApplicationContext ctx1 = new ClassPathXmlApplicationContext("kr/co/softcampus/config/beans.xml");
		TestBean1 xml1 = ctx1.getBean("xml1",TestBean1.class);
		System.out.println("xml1.data1:"+xml1.getData1());
		System.out.println("xml1.data2:"+xml1.getData2());
		
		ctx1.close();
		
		System.out.println("========================");
		AnnotationConfigApplicationContext ctx2 = new AnnotationConfigApplicationContext(BeanConfigClass.class);
		TestBean1 java1 = ctx2.getBean("java1",TestBean1.class);
		System.out.println("java1.data1:"+java1.getData1());
		System.out.println("java1.data2:"+java1.getData2());
		
		ctx2.close();
	}

}

출력값

xml1.data1:0
xml1.data2:kr.co.softcampus.beans.DataBean1@175c2241

========================

java1.data1:0
java1.data2:kr.co.softcampus.beans.DataBean1@2d52216b

data2의 값이 자동으로 주입된것을 볼 수 있다.

2)자동 주입 변수

package kr.co.softcampus.beans;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Required;

public class TestBean1 {
	private int data1;
	private DataBean1 data2;
	
	//자동 주입을 변수에 설정.
	//자동으로 setter 메서드가 추가되어 setter메서드를 통해 주입 받게된다.
	@Autowired
	private DataBean1 data3;
	
	public DataBean1 getData3() {
		return data3;
	}
	public int getData1() {
		return data1;
	}
	public void setData1(int data1) {
		this.data1 = data1;
	}
	public DataBean1 getData2() {
		return data2;
	}
	
	
	//자동 주입(타입):매개변수 타입이 DataBean1이라고 정의되어있기때문에 DataBean1 타입으로 정의되어있는 bean객체를 찾아서 자동 주입해줌(DataBean1 타입이 정의되어 있지 않으면 오류발생)
	@Autowired
	public void setData2(DataBean1 data2) {
		this.data2 = data2;
	}
	
	
	
}

private DataBean1 data3 -> 자동 주입을 변수에 설정가능하다. 자동으로 setter 메서드가 추가되어 setter메소드를 생성해줄 필요가없음.

package kr.co.softcampus.main;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import kr.co.softcampus.beans.TestBean1;
import kr.co.softcampus.config.BeanConfigClass;

public class MainClass {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ClassPathXmlApplicationContext ctx1 = new ClassPathXmlApplicationContext("kr/co/softcampus/config/beans.xml");
		TestBean1 xml1 = ctx1.getBean("xml1",TestBean1.class);
		System.out.println("xml1.data1:"+xml1.getData1());
		System.out.println("xml1.data2:"+xml1.getData2());
		System.out.println("xml1.data3:"+xml1.getData3());
		
		ctx1.close();
		
		System.out.println("========================");
		AnnotationConfigApplicationContext ctx2 = new AnnotationConfigApplicationContext(BeanConfigClass.class);
		TestBean1 java1 = ctx2.getBean("java1",TestBean1.class);
		System.out.println("java1.data1:"+java1.getData1());
		System.out.println("java1.data2:"+java1.getData2());
		System.out.println("java1.data3:"+java1.getData3());
		ctx2.close();
	}

}

출력값

xml1.data1:0
xml1.data2:kr.co.softcampus.beans.DataBean1@6c6cb480
xml1.data3:kr.co.softcampus.beans.DataBean1@6c6cb480

========================

java1.data1:0
java1.data2:kr.co.softcampus.beans.DataBean1@60bd273d
java1.data3:kr.co.softcampus.beans.DataBean1@60bd273d

data3값에 자동으로 객체가 주입된것을 볼 수 있다.~

@Qualifier

package kr.co.softcampus.beans;

public class DataBean2 {

}

DataBean2 클래스 생성

package kr.co.softcampus.beans;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Required;

public class TestBean1 {
	private int data1;
	private DataBean1 data2;
	
	//자동 주입을 변수에 설정.
	//자동으로 setter 메서드가 추가되어 setter메서드를 통해 주입 받게된다.
	@Autowired
	private DataBean1 data3;
	
	@Autowired
	@Qualifier("obj4")
	private DataBean2 data4;
	
	@Autowired
	@Qualifier("obj5")
	private DataBean2 data5;
	
	public DataBean2 getData5() {
		return data5;
	}
	public DataBean2 getData4() {
		return data4;
	}
	public DataBean1 getData3() {
		return data3;
	}
	public int getData1() {
		return data1;
	}
	public void setData1(int data1) {
		this.data1 = data1;
	}
	public DataBean1 getData2() {
		return data2;
	}
	
	
	//자동 주입(타입):매개변수 타입이 DataBean1이라고 정의되어있기때문에 DataBean1 타입으로 정의되어있는 bean객체를 찾아서 자동 주입해줌(DataBean1 타입이 정의되어 있지 않으면 오류발생)
	@Autowired
	public void setData2(DataBean1 data2) {
		this.data2 = data2;
	}
	
	
	
}

@Autowired
@Qualifier("obj4")
private DataBean2 data4;

자동 주입 변수 선언후 Qualifier 설정

@Autowired
@Qualifier("obj5")
private DataBean2 data5;

자동 주입 변수 선언후 Qualifier 설정

package kr.co.softcampus.config;

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

import kr.co.softcampus.beans.DataBean1;
import kr.co.softcampus.beans.DataBean2;
import kr.co.softcampus.beans.TestBean1;

@Configuration
public class BeanConfigClass {
	@Bean
	public TestBean1 java1() {
		return new TestBean1();
	}
	
	@Bean
	public DataBean1 data_bean1() {//DataBean1 타입으로 만든 bean생성 자동주입가능~!
		return new DataBean1();
	}
	
	@Bean
	public DataBean2 obj4() {
		return new DataBean2();
	}
	
	@Bean
	public DataBean2 obj5() {
		return new DataBean2();
	}
	
}

Qualifier 설정한 이름과 같은 Bean obj4와 obj5 생성(java)

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
						http://www.springframework.org/schema/beans/spring-beans.xsd
						http://www.springframework.org/schema/context
						http://www.springframework.org/schema/context/spring-context.xsd">
						
	<!-- bean 클래스에 설정되어 있는 어노테이션을 이용한다. -->
	<context:annotation-config/>
	
	<bean id='xml1' class='kr.co.softcampus.beans.TestBean1'/>
	
	<bean class='kr.co.softcampus.beans.DataBean1'/>
	
	<bean id='obj4' class='kr.co.softcampus.beans.DataBean2'/>
	<bean id='obj5' class='kr.co.softcampus.beans.DataBean2'/>
	
						
</beans>

Qualifier 설정한 이름과 같은 Bean obj4와 obj5 생성(xml)

package kr.co.softcampus.main;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import kr.co.softcampus.beans.TestBean1;
import kr.co.softcampus.config.BeanConfigClass;

public class MainClass {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ClassPathXmlApplicationContext ctx1 = new ClassPathXmlApplicationContext("kr/co/softcampus/config/beans.xml");
		TestBean1 xml1 = ctx1.getBean("xml1",TestBean1.class);
		System.out.println("xml1.data1:"+xml1.getData1());
		System.out.println("xml1.data2:"+xml1.getData2());
		System.out.println("xml1.data3:"+xml1.getData3());
		System.out.println("xml1.data4:"+xml1.getData4());
		System.out.println("xml1.data5:"+xml1.getData5());
		
		ctx1.close();
		
		System.out.println("========================");
		AnnotationConfigApplicationContext ctx2 = new AnnotationConfigApplicationContext(BeanConfigClass.class);
		TestBean1 java1 = ctx2.getBean("java1",TestBean1.class);
		System.out.println("java1.data1:"+java1.getData1());
		System.out.println("java1.data2:"+java1.getData2());
		System.out.println("java1.data3:"+java1.getData3());
		System.out.println("java1.data4:"+java1.getData4());
		System.out.println("java1.data5:"+java1.getData5());
		
		ctx2.close();
	}

}

출력값

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