[Spring] Spring에서 새터(Setter)로 리스트(List), 맵(Map) 자료구조 주입

| 리스트(List) 및 맵(Map) 자료구조 주입

xml 설정 파일 상에서 새터(Setter) 방식을 이용하여 자바의 리스트(List) 혹은 맵(Map)에 의존성을 주입할 수 있다.

<?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="resturant1" class="com.tutorial.spring.Resturant">
        <property name="names">
            <list>
                <value>Duke</value>
                <value>Mario</value>
                <value>Suzy</value>
                <value>Kate</value>
            </list>
        </property>

        <property name="menus">
            <map>
                <entry>
                    <key>
                        <value>1</value>
                    </key>
                    <value>KingCrap</value>
                </entry>
                <entry>
                    <key>
                        <value>2</value>
                    </key>
                    <value>IceCream</value>
                </entry>
                <entry>
                    <key>
                        <value>3</value>
                    </key>
                    <value>Pork</value>
                </entry>
            </map>
        </property>
    </bean>
</beans>

<appContext2.xml 설정파일>

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.springframework.context.support.GenericXmlApplicationContext;

class Resturant {

    private List<String> names;
    private Map<Integer, String> menus;

    Resturant(){
        names = new ArrayList<>();
        menus = new HashMap<>();
    }

    public List<String> getNames() {
        return names;
    }

    public void setNames(List<String> names) {
        this.names = names;
    }

    public Map<Integer, String> getMenus() {
        return menus;
    }

    public void setMenus(Map<Integer, String> menus) {
        this.menus = menus;
    }
}

public class App {

    public static void main(String[] args) {
        GenericXmlApplicationContext ctx = new GenericXmlApplicationContext("classpath:appContext2.xml");
        Resturant resturant = ctx.getBean("resturant1", Resturant.class);

        System.out.println("--- names property ---");
        resturant.getNames().stream().forEach(System.out::println);
        System.out.println("--- menus property ---");
        resturant.getMenus().forEach((k, v) -> {
            System.out.println("key : " + k + " " + "value : " + v);
        });
    }
}

11월 28, 2018 11:15:32 오후 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
정보: Loading XML bean definitions from class path resource [appContext2.xml]
11월 28, 2018 11:15:32 오후 org.springframework.context.support.AbstractApplicationContext prepareRefresh
정보: Refreshing org.springframework.context.support.GenericXmlApplicationContext@439f5b3d: startup date [Wed Nov 28 23:15:32 KST 2018]; root of context hierarchy
11월 28, 2018 11:15:32 오후 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
정보: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@59a6e353: defining beans [resturant1]; root of factory hierarchy
--- names property ---
Duke
Mario
Suzy
Kate
--- menus property ---
key : 1 value : KingCrap
key : 2 value : IceCream
key : 3 value : Pork

<실행 자바 코드>