Spring) .xml을 통한 HashMap 세팅

public interface ProtocolHandler {

}

public class RestHandler implements ProtocolHandler {

}

public class RssHandler implements ProtocolHandler {

}

public class ProtocolHandlerFactory {

//Map(key , value)  

private Map<String, ProtocolHandler> handlers;

public void setHandlers(Map<String, ProtocolHandler> handlers) {

this.handlers = handlers;

System.out.println("setter 주입 성공 : " + this.handlers);

}

}

public class Program {

    public static void main(String[] args) {

        /*

        ProtocolHandlerFactory factory = new ProtocolHandlerFactory();

        

        Map<String, ProtocolHandler> map = new HashMap<>();

        map.put("rss", new RssHandler());

        map.put("rest", new RestHandler());

        

factory.setHandlers(map);

     */

        ApplicationContext context =

                new GenericXmlApplicationContext("classpath:DI_09_Spring/DI_09.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.xsd">

<!--

IOC 컨테이너 (Spring 전용 메모리 공간) 안에

생성될 객체를 만들고 조립(의존)관계 설정 하는 파일

ProtocolHandlerFactory factory = new ProtocolHandlerFactory();

        

Map<String, ProtocolHandler> map = new HashMap<>();

map.put("rss", new RssHandler());

    map.put("rest", new RestHandler());

        

factory.setHandlers(map);

-->

    <bean id="factory" class="DI_09_Spring.ProtocolHandlerFactory">

        

        <property name="handlers">

            <map>

                <entry>

                    <key><value>rss</value></key>

                    <ref bean="rsshandler" />

                </entry>

                <entry>

                    <key><value>rest</value></key>

                    <!-- 이렇게 bean을 만들면서 여기서 넣어도 된다 -->

                    <bean class="DI_09_Spring.RestHandler"></bean>

                </entry>

            </map>

        </property>

    </bean>

    

    <!-- 이렇게 bean을 만들어서 위에서 bean id로 넣어도 된다 -->

    <bean id="rsshandler" class="DI_09_Spring.RssHandler" ></bean>

</beans>