Spring | 컬렉션(collection) 생성과 목록 DI | Namespaces util

ArrayList 생성과 사용

Program.java

package spring.di;

import java.util.ArrayList;
import java.util.List;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import spring.di.entity.Exam;
import spring.di.entity.NewIecExam;
import spring.di.ui.ExamConsole;
import spring.di.ui.GridExamConsole;
import spring.di.ui.InlineExamConsole;

public class Program {

	public static void main(String[] args) {
		
		/* 스프링에게 지시하는 방법으로 코드를 변경
		 * Exam exam = new NewIecExam();
		 * Exam exam = new NewIecExam(10,10,10,10); 
		 * ExamConsole console = new GridExamConsole();
		 * 
		 * console.setExam(exam);
		 */
		
		//지시서 읽어들이기
		ApplicationContext context = new ClassPathXmlApplicationContext("spring/di/setting.xml");
		
		Exam exam = context.getBean(Exam.class);
		System.out.println(exam.toString());
		//ExamConsole console = (ExamConsole) context.getBean("console"); //id로 꺼내기
		ExamConsole console = context.getBean(ExamConsole.class); //(가르키는 인터페이스 형식에 찹조하는 객체를 찾아준다.) 클래스명으로 가져오기
		console.print();
		
		List<Exam> exams = (List<Exam>) context.getBean("exams"); //new ArrayList<>();
		exams.add(new NewIecExam(1,1,1,1));
		
		for(Exam e : exams)
			System.out.println(e);
		
	}

}

 

 

setting.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"
	xmlns:p="http://www.springframework.org/schema/p"
	xmlns:util="http://www.springframework.org/schema/util"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.3.xsd">
	<!-- Exam exam = new NewIecExam(); -->
	<bean id="exam" class="spring.di.entity.NewIecExam" p:kor="10"  p:eng="10" />
	<!-- 	
	<bean id="exam" class="spring.di.entity.NewIecExam" >
		<constructor-arg name="kor" value="10" />
		<constructor-arg name="math" value="10" />
		<constructor-arg name="com" value="10" />
		<constructor-arg name="eng" value="10" />
	</bean> 
	-->
	<!-- ExamConsole console = new GridExamConsole(); -->
	<bean id="console" class="spring.di.ui.GridExamConsole" >
		<!-- console.setExam(exam); -->
		<property name="exam" ref="exam" />
	</bean>	
	
	<!-- ArrayList를 생성자로 넘기는 방식 -->
	<bean id="exams" class="java.util.ArrayList">
		<constructor-arg>
			<list>
				<bean class="spring.di.entity.NewIecExam" p:kor="10"  p:eng="10" /> <!-- 직접생성 -->
				<ref bean="exam" /> <!-- 위에 참조 -->
			</list>
		</constructor-arg>
	</bean>
</beans>

---

컬랙션을 개별적으로 만드는 방법 - Namespaces util 

별도의 Namespaces 이용

Program.java

package spring.di;

import java.util.ArrayList;
import java.util.List;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import spring.di.entity.Exam;
import spring.di.entity.NewIecExam;
import spring.di.ui.ExamConsole;
import spring.di.ui.GridExamConsole;
import spring.di.ui.InlineExamConsole;

public class Program {

	public static void main(String[] args) {
		
		/* 스프링에게 지시하는 방법으로 코드를 변경
		 * Exam exam = new NewIecExam();
		 * Exam exam = new NewIecExam(10,10,10,10); 
		 * ExamConsole console = new GridExamConsole();
		 * 
		 * console.setExam(exam);
		 */
		
		//지시서 읽어들이기
		ApplicationContext context = new ClassPathXmlApplicationContext("spring/di/setting.xml");
		
		Exam exam = context.getBean(Exam.class);
		System.out.println(exam.toString());
		
		ExamConsole console = (ExamConsole) context.getBean("console"); //id로 꺼내기
		//ExamConsole console = context.getBean(ExamConsole.class); //(가르키는 인터페이스 형식에 찹조하는 객체를 찾아준다.) 클래스명으로 가져오기
		console.print();
		
		List<Exam> exams = (List<Exam>) context.getBean("exams"); //new ArrayList<>();
		//exams.add(new NewIecExam(1,1,1,1));
		
		for(Exam e : exams)
			System.out.println(e);
		
	}

}

 

setting.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"
	xmlns:p="http://www.springframework.org/schema/p"
	xmlns:util="http://www.springframework.org/schema/util"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.3.xsd">
	<!-- Exam exam = new NewIecExam(); -->
	<bean id="exam" class="spring.di.entity.NewIecExam" p:kor="10"  p:eng="10" />
	<!-- 	
	<bean id="exam" class="spring.di.entity.NewIecExam" >
		<constructor-arg name="kor" value="10" />
		<constructor-arg name="math" value="10" />
		<constructor-arg name="com" value="10" />
		<constructor-arg name="eng" value="10" />
	</bean> 
	-->
	<!-- ExamConsole console = new GridExamConsole(); -->
	<bean id="console" class="spring.di.ui.GridExamConsole" >
		<!-- console.setExam(exam); -->
		<property name="exam" ref="exam" />
	</bean>	
	
	<!-- 컬랙션 실제로 객체를 만드는 능력 -->
	<util:list id="exams" list-class="java.util.ArrayList">
		<bean class="spring.di.entity.NewIecExam" p:kor="1"  p:eng="1" /> <!-- 직접생성 -->
		<ref bean="exam" /> <!-- 위에 참조 -->
	</util:list>
	
	<!-- ArrayList를 생성자로 넘기는 방식 -->
	<!-- <bean id="exams" class="java.util.ArrayList">
		<constructor-arg>
			<list>
				<bean class="spring.di.entity.NewIecExam" p:kor="10"  p:eng="10" /> 직접생성
				<ref bean="exam" /> 위에 참조
			</list>
		</constructor-arg>
	</bean> -->
</beans>