스프링 DI - 자바코드 설정

package com.spring4.practice01;

public interface Car {

public String brand();

}

package com.spring4.practice01;

public class CarImpl implements Car {

@Override

public String brand() {

return "자동차는 삼성 SM5입니다";

}

}

package com.spring4.practice01;

public interface Tire {

public String mount();

}

package com.spring4.practice01;

public class TireImpl implements Tire {

public String mount(){

return "타이어는 한국타이어 장착했네요.";

}

}

package com.spring4.practice01;

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

public class Service {

@Autowired

Car car;

@Autowired

Tire tire;

public Service(){

}

public void test(){

System.out.println("테스트입니다.");

System.out.println("Car객체: "+car);

}

public void print(){

System.out.println("car: "+car.brand());

System.out.println("tire: "+tire.mount());

}

}

package com.spring4.practice01;

import org.springframework.context.ApplicationContext;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import org.springframework.context.support.GenericXmlApplicationContext;

public class CarMain {

public static void main(String[] args) {

ApplicationContext ctx = new AnnotationConfigApplicationContext(JavaConfig.class);

Service service = (Service)ctx.getBean("service",Service.class);

service.print();

service.test();

}

}

자바 설정 파일:

자바설정 파일 테스트를 위해 pom.xml 파일에 cglib를 추가해야한다.

pom.xml 파일에 추가해서 메이븐으로 자동 다운로드 받으면 된다.

<!-- https://mvnrepository.com/artifact/cglib/cglib -->

<dependency>

   <groupId>cglib</groupId>

   <artifactId>cglib</artifactId>

   <version>3.2.3</version>

</dependency>

package com.spring4.practice01;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import com.spring4.practice01.CarImpl;

import com.spring4.practice01.Tire;

import com.spring4.practice01.Service;

@Configuration

public class JavaConfig {

@Bean

public Car car(){

return new CarImpl();

}

@Bean

public Tire tire(){

return new TireImpl();

}

@Bean

public Service service(){

return new Service();

}

}

생성자 방식은  요약해서 아래에 기술한다.

@Bean

public Service service(){

return new Service(car(), tire());

}

public Service(){

}

public Service(Car car, Tire tire){

this.car = car;

this.tire = tire;

}

// 위에 처럼 생성자에다가 직접 값을 넣고, 받으면 됨.

public void test(){

System.out.println("테스트입니다.");

System.out.println("Car객체: "+car);

}