DAY 60 - 스프링 프레임 워크 HOMEWORK (2024.09.30)

[문제1]

Package : sample02

Interface : Calc.java

추상Method : public void calculate(int x, int y);

Class : HelloSpring - public static void main(String[] args)

            CalcAdd.java - Calc.java 오버라이드

            CalcMul.java - Calc.java 오버라이드

 

[실행결과]

25 + 36 = xx

25 * 36 = xxx

 

xml안에서는 xml로 해주고 !!

어노테이션 안에서는 어노테이션으로 !!

---

Chapter01_XML

Interface : Calc.java

package sample02;

public interface Calc {
	public void calculate(int x, int y);
}

 

---

CalcAdd.java

package sample02;

public class CalcAdd implements Calc {
	@Override
	public void calculate(int x, int y) {
		
		System.out.println(x + " + " + y + " = " + (x+y));
		
	}
}

---

CalcMul.java

package sample02;

public class CalcMul implements Calc {

	@Override
	public void calculate(int x, int y) {
		System.out.println(x + " * " + y + " = " + (x*y));
		
	}
}

---

HelloSpring.java

package sample02;

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

public class HelloSpring {

	public static void main(String[] args) {	
		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
		Calc calc = (Calc) context.getBean("calcAdd");
		calc.calculate(25, 36);
	}

}

---

applicaionContext.xml

<bean id="calcAdd" class="sample02.CalcMul" scope="prototype"></bean>

<?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:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

	<!-- sample01 -->
	<bean id="messageBean" class="sample01.MessageBeanKo" scope="prototype"></bean>
	
	<!-- sample02 -->
	<bean id="calcAdd" class="sample02.CalcAdd" scope="prototype"></bean>
</beans>

---

<bean id="calcMul" class="sample02.CalcMul" scope="prototype"></bean>

<?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:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

	<!-- sample01 -->
	<bean id="messageBean" class="sample01.MessageBeanKo" scope="prototype"></bean>
	<!-- scope="prototype"
		 scope="request"
		 scope="session"
		 scope="singleton"
	-->
	
	
	<!-- sample02 -->
	<bean id="calcAdd" class="sample02.CalcAdd" scope="prototype"></bean>
	<bean id="calcMul" class="sample02.CalcMul" scope="prototype"></bean>
	
</beans>

---

calc = context.getBean("calcMul", Calc.class); // 이렇게 하면 캐스팅 안 시켜도 된다.
calc.calculate(25, 36);

package sample02;

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

public class HelloSpring {

	public static void main(String[] args) {	
		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
		Calc calc = (Calc) context.getBean("calcAdd");
		calc.calculate(25, 36);
		
		calc = context.getBean("calcMul", Calc.class); // 이렇게 하면 캐스팅 안 시켜도 된다.
		calc.calculate(25, 36);
	}

}

---

Chapter01_ANNO

 

applicaionContext.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:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

	<context:component-scan base-package="sample01" />
	<context:component-scan base-package="sample02" />
</beans>

---

HelloSpring.java -- 경로 바꿔주기

package sample02;

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

public class HelloSpring {

	public static void main(String[] args) {	
		ApplicationContext context = new FileSystemXmlApplicationContext("src/main/resources/applicationContext.xml");
		Calc calc = (Calc) context.getBean("calc");
		calc.calc(25, 36);
	}

}

 

---

CalcAdd.java

package sample02;

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

@Component("calcAdd")
@Scope("prototype")
public class CalcAdd implements Calc {
	@Override
	public void calculate(int x, int y) {
		
		System.out.println(x + " + " + y + " = " + (x+y));
		
	}
}

 

클래스명하고 똑같으면 @Component 뒤에 이름을 안 적어도된다 !!

package sample02;

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

@Component
@Scope("prototype")
public class CalcAdd implements Calc {
	@Override
	public void calculate(int x, int y) {
		
		System.out.println(x + " + " + y + " = " + (x+y));
		
	}
}

---

 

CalcMul.java

package sample02;

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

@Component
@Scope("prototype")
public class CalcMul implements Calc {
	@Override
	public void calculate(int x, int y) {
		System.out.println(x + " * " + y + " = " + (x*y));
		
	}
}

 

---

HelloSpring.java

package sample02;

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

public class HelloSpring {

	public static void main(String[] args) {	
		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
		Calc calc = (Calc) context.getBean("calcAdd");
		calc.calculate(25, 36);
		
		calc = context.getBean("calcMul", Calc.class); // 이렇게 하면 캐스팅 안 시켜도 된다.
		calc.calculate(25, 36);
	}

}

---

[문제2] 성적계산

이름, 국어, 영어, 수학점수를 입력하여 총점과 평균을 구하여 출력하시오

- Scanner는 <bean> 으로 생성하는 것이 아니라 new 하면 된다.

 

Project : Chapter01_XML

Package : sample03

 

Interface : SungJuk.java

추상메소드 : public void calc();

                     public void display();

 

Class : SungJukImpl.java - SungJuk를 Override하는 클래스

Field : name, kor, eng, math, tot, avg

Method : 기본 생성자 - Scanner 통해서 데이터 입력

public void calc() - 총점, 평균 계산

public void display() - 출력

 

Class : HelloSpring.java - public static void main(String[] args)

 

[실행결과]

이름 입력 :

국어 입력 :

영어 입력 :

수학 입력 :

 

이름 국어 영어 수학 총점 평균

홍길동 95 78 96 269 89.667

---

Chapter01_XML

SungJuk.java -- 인터페이스 생성

package sample03;

public interface SungJuk {
	public void calc();
	public void display();
}

---

SungJukImpl.java -- SungJuk를 Override하는 클래스

public void calc() - 총점, 평균 계산

public void display() - 출력

package sample03;

import java.util.Scanner;

public class SungJukImpl implements SungJuk {
	private String name;
	private int kor;
	private int eng;
	private int math;
	private int tot;
	private double avg;
	
	public SungJukImpl() {
		Scanner scan = new Scanner(System.in);
		System.out.print("이름 입력 : ");
		name = scan.next();

		System.out.print("국어 입력 : ");
		kor = scan.nextInt();
		
		System.out.print("영어 입력 : ");
		eng = scan.nextInt();
		
		System.out.print("수학 입력 : ");
		math = scan.nextInt();
	}
	
	@Override
	public void calc() {
		tot = kor + eng + math;
		avg = tot / 3.0;

	}

	@Override
	public void display() {
		System.out.println("이름\t국어\t영어\t수학\t총점\t평균\t");
		System.out.println(name + "\t"
				         + kor + "\t"
				         + eng + "\t"
				         + math + "\t"
				         + tot + "\t"
				         + String.format("%.2f", avg) + "\t");
	}

}

---

HelloSpring.java

package sample03;

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

public class HelloSpring {

	public static void main(String[] args) {
		ApplicationContext context = new FileSystemXmlApplicationContext("src/applicationContext.xml");
		SungJuk sungJuk = (SungJuk)context.getBean("sungJukImpl");
		sungJuk.calc();
		sungJuk.display();
	}

}

---

applicationContext.xml

<bean id="sungJukImpl" class="sample03.SungJukImpl" scope="prototype"></bean>

	<!-- sample03 -->
	<bean id="sungJukImpl" class="sample03.SungJukImpl" scope="prototype"></bean>

 

---

Chapter01_ANNO

---

applicationContext.xml -- 이거 먼저 건들기 !

<context:component-scan base-package="sample03" />

<?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:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

	<context:component-scan base-package="sample01" />
	<context:component-scan base-package="sample02" />
	<context:component-scan base-package="sample03" />
</beans>

---

SungJukImpl.java -- @Component("sungJuk") / @Scope("prototype") -- 어노테이션 생성

package sample03;

import java.util.Scanner;

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

@Component
@Scope("prototype")
public class SungJukImpl implements SungJuk {
	private String name;
	private int kor;
	private int eng;
	private int math;
	private int tot;
	private double avg;
	
	@Override
	public void calc() {
		Scanner scan = new Scanner(System.in);
		System.out.print("이름 입력 : ");
		name = scan.next();

		System.out.print("국어 입력 : ");
		kor = scan.nextInt();
		
		System.out.print("영어 입력 : ");
		eng = scan.nextInt();
		
		System.out.print("수학 입력 : ");
		math = scan.nextInt();
		
		tot = kor + eng + math;
		avg = tot / 3.0;

	}

	@Override
	public void display() {
		System.out.println("이름\t국어\t영어\t수학\t총점\t평균\t");
		System.out.println(name + "\t"
				         + kor + "\t"
				         + eng + "\t"
				         + math + "\t"
				         + tot + "\t"
				         + String.format("%.2f", avg) + "\t");
	}

}

---

HelloSpring.java 

package sample03;

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

public class HelloSpring {

	public static void main(String[] args) {
		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
		SungJuk sungJuk = (SungJuk)context.getBean("sungJukImpl");
		sungJuk.calc();
		sungJuk.display();
	}

}