Spring(DI)_02_03

2025-01-21

 

 

 

 

 

 

INFO : org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loading XML bean definitions from class path resource [mydao.xml]
INFO : org.springframework.context.support.GenericXmlApplicationContext - Refreshing org.springframework.context.support.GenericXmlApplicationContext@32cf48b7: startup date [Tue Jan 21 21:14:52 KST 2025]; root of context hierarchy
INFO : org.springframework.beans.factory.support.DefaultListableBeanFactory - Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@687e99d8: defining beans [mysql,oracle,service]; root of factory hierarchy
MySqlDAO 데이터베이스 연동입니다
INFO : org.springframework.context.support.GenericXmlApplicationContext - Closing org.springframework.context.support.GenericXmlApplicationContext@32cf48b7: startup date [Tue Jan 21 21:14:52 KST 2025]; root of context hierarchy
INFO : org.springframework.beans.factory.support.DefaultListableBeanFactory - Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@687e99d8: defining beans [mysql,oracle,service]; root of factory hierarchy

 

package com.spring.di03;

import org.springframework.context.support.GenericXmlApplicationContext;

public class Main {

	public static void main(String[] args) {
		
		GenericXmlApplicationContext contaier = 
				new GenericXmlApplicationContext("mydao.xml");
		
		DAOImpl dao = (DAOImpl)contaier.getBean("service");
		
		dao.connect();
		
		contaier.close();
	}
}

 

package com.spring.di03;

public interface DAO {

	void add();	// 추상 메서드
}

 

package com.spring.di03;

import lombok.Data;

@Data
public class DAOImpl {

	private DAO dao;
	
	// 비지니스 로직
	public void connect() {
		this.dao.add();
	}
}

 

package com.spring.di03;

public class MySqlDAO implements DAO {

	@Override
	public void add() {
		System.out.println("MySqlDAO 데이터베이스 연동입니다");
	}

}

 

package com.spring.di03;

public class OracleDAO implements DAO {

	@Override
	public void add() {
		System.out.println("OracleDAO 데이터베이스 연동입니다");
	}

}

 

<?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="mysql" class="com.spring.di03.MySqlDAO"/>
	<bean id="oracle" class="com.spring.di03.OracleDAO"/>
	<bean id="service" class="com.spring.di03.DAOImpl">
		<!-- name="dao" ==> 변수명 -->
		<property name="dao">
			<ref bean="mysql"/>
		</property>
	</bean>

</beans>