[자바교육,스프링교육(Spring Framework/Boot)추천_탑크리에듀]#20.ApplicationContext의 분리(부모, 자식)

#20.ApplicationContext의 분리(부모, 자식)

ApplicationContext의 분리(부모, 자식)

n  한 컨텍스는 다른 컨텍스트의 부모가 될 수 있다. 자식 컨텍스에 있는 빈이 부모 컨텍스트에 있는 빈 참조 가능한데 스프링은 ApplicationContext 중첩 기능을 제공 함으로서 설정을 여러 파일로 나눌 수 있게 해준다. 자식 컨텍스트에서 부모 컨텍스트의 빈을 참조하는 방식은 동일하다. 단 이름이 같은 것이 있다면 ref 태그에서 parent 속성을 사용하면 된다.

[parent.xml]

<?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-4.2.xsd">

<bean id="parent1" class="java.lang.String">

<constructor-arg>

<value>parent bean 1</value>

</constructor-arg>

</bean>

<bean id="parent2" class="java.lang.String">

<constructor-arg>

<value>parent bean 2</value>

</constructor-arg>

</bean>

</beans>

[child.xml]

<?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-4.2.xsd">

<bean id="target1" class="onj.context.overlap.Onj">

<property name="val1">

<ref bean="parent1"/>

</property>

</bean>

<bean id="target2" class="onj.context.overlap.Onj">

<property name="val2">

<ref parent="parent2"/> <!– 부모 context에서 parent2라는 id,name을 검색 à

</property>

</bean>

<bean id="parent2" class="java.lang.String">

<constructor-arg>

<value>child bean 2</value>

</constructor-arg>

</bean>

</beans>

[Onj.java]

package onj.context.overlap;

public class Onj {

private String val1;

private String val2;

public String getVal1() {

           return val1;

}

public void setVal1(String val1) {

         this.val1 = val1;

}

public String getVal2() {

           return val2;

}

public void setVal2(String val2) {

           this.val2 = val2;

}

}

[ContextOverlapExam.java]

package onj.context.overlap;

import org.springframework.context.support.GenericXmlApplicationContext;

public class ContextOverlapExam {

public static void main(String[] args) {

GenericXmlApplicationContext parent = new GenericXmlApplicationContext();

parent.load("classpath:parent.xml");

parent.refresh();

GenericXmlApplicationContext child = new GenericXmlApplicationContext();

child.load("classpath:child.xml");

child.setParent(parent);

child.refresh();

Onj target1 = (Onj) child.getBean("target1");

Onj target2 = (Onj) child.getBean("target2");

String target3 = (String) child.getBean("parent2");

System.out.println(target1.getVal1());

System.out.println(target2.getVal2());

System.out.println(target3);

}

}