스프링 DI(Dependency Injection) 2

Setter로 DI 주입

package com.spring4.practice01;

public interface Car {

public String brand();

}

package com.spring4.practice01;

public class CarHDImpl implements Car {

public String brand(){

return "자동차는 현대자동차 소나타입니다.";

}

}

package com.spring4.practice01;

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

public class Service {

private Car car;

public Service(){}

  public void setCar(Car car){

this.car = car;

}

public void print(){

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

}

}

생성자 방식과 다른 건 setCar에서 setXxx 이후 이름과 property name이름이 같은면 된다.

즉 setCar에서 Car의 첫 대문자만 소문자로 바꾸고 name을 설정하면 된다.

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

<bean id="car" class="com.spring4.practice01.CarHDImpl" />

<bean id="service" class="com.spring4.practice01.Service">

<property name="car" ref="car"/>

</bean>

</beans>

package com.spring4.practice01;

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

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.GenericXmlApplicationContext;

public class MainCar {

public static void main(String[] args) {

ApplicationContext ctx = new GenericXmlApplicationContext("classpath:carBean.xml");

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

service.print();

}

}