[Spring] map구조

MapTest.java

package com.sist.di08;

import java.util.Map;
import java.util.Set;

import lombok.Data;

@Data
public class MapTest {
	
	// Map 자료형 선언, 멤버변수
	private Map<Integer, String> map;
	
	// 비즈니스 로직
	public void prn() {
		// keySet() : Map에 있는 키를 전부 가져오는 메소드
		Set<Integer> set = map.keySet();
		
		for(Integer k : set) {
			System.out.println(map.get(k));
		}
	}
}

 

map.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">

	<bean id="test" class="com.sist.di08.MapTest">
		<property name="map">
			<map>	
				<entry>	<!-- map의 하나의 태그 라는 의미 -->
					<key> <value>1</value> </key>	<!-- 키는 1 -->
					<value>짜장면</value>	<!-- 값은 '짜장면' -->
				</entry>
				
				<entry>	
					<key> <value>2</value> </key>	
					<value>짬뽕</value>	
				</entry>
				
				
				<entry>	
					<key> <value>3</value> </key>
					<value>탕수육</value>
				</entry>
				
				<entry>	
					<key> <value>4</value> </key>
					<value>볶음밥</value>
				</entry>
				
				<entry>	
					<key> <value>5</value> </key>
					<value>울면</value>
				</entry>
			</map>
		</property>
	</bean>

</beans>

 

Main.java

package com.sist.di08;

import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.GenericXmlApplicationContext;

public class Main {

	public static void main(String[] args) {
		AbstractApplicationContext ctx=
				new GenericXmlApplicationContext("classpath:map.xml");
		
		MapTest test = ctx.getBean("test", MapTest.class);
		
		test.prn();	// 비즈니스로직 호출
		
		ctx.close();	
		
	}

}

결과

INFO : org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loading XML bean definitions from class path resource [map.xml]
INFO : org.springframework.context.support.GenericXmlApplicationContext - Refreshing org.springframework.context.support.GenericXmlApplicationContext@51521cc1: startup date [Mon Dec 13 14:33:56 KST 2021]; root of context hierarchy
INFO : org.springframework.beans.factory.support.DefaultListableBeanFactory - Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@6537cf78: defining beans [test]; root of factory hierarchy
짜장면
짬뽕
탕수육
볶음밥
울면
INFO : org.springframework.context.support.GenericXmlApplicationContext - Closing org.springframework.context.support.GenericXmlApplicationContext@51521cc1: startup date [Mon Dec 13 14:33:56 KST 2021]; root of context hierarchy
INFO : org.springframework.beans.factory.support.DefaultListableBeanFactory - Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@6537cf78: defining beans [test]; root of factory hierarchy