Spring.Di

문이빈·2023년 9월 14일
9/14
0

Cloud기반 웹 DevOps 프로젝트 개발자 과정

목록 보기
62/87

DI(Denpendency Injection)

★★★★★★스프링의 핵심개념★★★★★★
객체 사이의 의존 관계를 자기 자신이 아닌 외부에 의해서 설정된 개념

  1. Constructor Injectoin
    생성자를 통해서 의존 관계를 연결
    <constructor-arg>를 추가해주어야 함

  2. Setter Injection
    : setter메소드를 이용하여 의존 관계를 연결시키는 것을 말한다.
    : <property>요소의 name 속성을 이용하여 값의 의존 관계를 연결시킬 대상이 되는 필드값을 지정한다

① 전달인자가 2개 이상인 경우

기본데이터 타입일 경우에는 value 요소를 사용하여 의존관계를 연결시키기 위한 값을 지정

public class Foo {
	private int a, b;

	public void setA(int a) { }
	public void setB(String b) { }
}

[applicationContext.xml]
<bean id="foo"   class="Foo">
	<property name="a">
		<value>25</value>
	</property>
	<property name="b" value="Hello" />
</bean>

② 객체를 전달할 경우에는 ref 요소를 사용

public class Foo {
	private Bar bar;
	
	public void setBar(Bar bar){
		this.bar = bar;
	}
}

public class Bar { }

[applicationContext.xml]
<bean   id="foo"   class="Foo">
	<property   name="bar"   ref="bar"></property>
</bean>

<bean   id="bar"   class="Bar" />

---------------------------------pom.xml---------------------------------

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>chapter02_XML</groupId>
  <artifactId>chapter02_XML</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.1</version>
        <configuration>
          <release>17</release>
        </configuration>
      </plugin>
    </plugins>
  </build>
  
  <!-- Spring Context -->
  <dependencies>
  	<dependency>
	    <groupId>org.springframework</groupId>
	    <artifactId>spring-context</artifactId>
	    <version>5.3.23</version>
	</dependency>
  
  <!-- Project Lombok -->
	<dependency>
	    <groupId>org.projectlombok</groupId>
	    <artifactId>lombok</artifactId>
	    <version>1.18.28</version>
	    <scope>provided</scope>
	</dependency>
</dependencies>
</project>

---------------------------------ApplicationContext.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">

	<bean id="messageBeanImpl" class="sample01.MessageBeanImpl">
		<constructor-arg>
			<value>사과</value>
		</constructor-arg>
		
		<property name="cost">
			<value>5000</value>
		</property>
		<property name="qty" value="3"></property>
	</bean>

</beans>

---------------------------------MessageBean.interface---------------------------------

package sample01;

public interface MessageBean {

	public void sayHello();
    public void sayHello(String fruit, int cost);
    public void sayHello(String fruit, int cost, int qty);

}

---------------------------------MessageBeanImpl.java---------------------------------

package sample01;

public class MessageBeanImpl implements MessageBean {
	
	private String fruit; /* 기본생성자 */
	private int cost; /* setter */
	private int qty;  /* setter */

	/* fruit 기본생성자 */
	public MessageBeanImpl(String fruit) {
		super(); /* 부모생성자 */
		this.fruit = fruit;

	}

	/* cost setter */
	public void setCost(int cost) {
		this.cost = cost;
	}

	/* qty setter */
	public void setQty(int qty) {
		this.qty = qty;
	}

	@Override
	public void sayHello() {
		System.out.println(fruit + "\t" + cost + "\t" + qty);

	}

	@Override
	public void sayHello(String fruit, int cost) {
		System.out.println(fruit + "\t" + cost + "\t" + qty);

	}

	@Override
	public void sayHello(String fruit, int cost, int qty) {
		System.out.println(fruit + "\t" + cost + "\t" + qty);

	}

}

---------------------------------HelloSpring.java---------------------------------

package sample01;

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

public class HelloSpring {
	
	public static void main(String[] args) {
		
		ApplicationContext applicationContext = new ClassPathXmlApplicationContext("ApplicationContext.xml");
		MessageBean messageBean = applicationContext.getBean("messageBeanImpl", MessageBean.class);
		messageBean.sayHello();
		messageBean.sayHello("바나나", 2500);
		messageBean.sayHello("참외", 10000, 2);
		
	}
	
}

xml에서 설정한 값을 나중에 설정한 값이 덮어 씌어주어서 값이 이와 같이 나옴

위 코드를 어노테이션으로 바꿈

---------------------------------ApplicationContext.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>

</beans>

---------------------------------MessageBeanImpl.java---------------------------------

package sample01;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component

public class MessageBeanImpl implements MessageBean {
	
	private String fruit; /* 기본생성자 */
	private int cost; /* setter */
	private int qty;  /* setter */

	/* Constructor Injection */
	/* fruit 기본생성자 */
	public MessageBeanImpl(@Value("사과") String fruit) {
		super(); /* 부모생성자 */
		this.fruit = fruit;

	}

	/* Setter Injection */
	/* cost setter */
	@Autowired /* setter는 자동으로 데이터를 주는 애가 아니여서 왼쪽과 같은 어노테이션을 줌 */
	public void setCost(@Value("5000") int cost) {
		this.cost = cost;
	}

	/* qty setter */
	@Autowired
	public void setQty(@Value("3") int qty) {
		this.qty = qty;
	}

	@Override
	public void sayHello() {
		System.out.println(fruit + "\t" + cost + "\t" + qty);

	}

	@Override
	public void sayHello(String fruit, int cost) {
		System.out.println(fruit + "\t" + cost + "\t" + qty);

	}

	@Override
	public void sayHello(String fruit, int cost, int qty) {
		System.out.println(fruit + "\t" + cost + "\t" + qty);

	}

}

---------------------------------HelloSpring.java---------------------------------

package sample01;

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

public class HelloSpring {
	
	public static void main(String[] args) {
		
		ApplicationContext applicationContext = new ClassPathXmlApplicationContext("ApplicationContext.xml");
		MessageBean messageBean = applicationContext.getBean("messageBeanImpl", MessageBean.class);
		messageBean.sayHello();
		messageBean.sayHello("바나나", 2500);
		messageBean.sayHello("참외", 10000, 2);
		
	}
	
}

생성

  1. xml => Lombok
  2. Annotation => @
    3. Java 파일

@Bean은

  • 메소드에서 return 되는 값을 스프링 빈으로 생성해준다.
  • 메소드의 이름은 반드시 빈의 id명으로 만들어야한다.
---------------------------------MessageBeanImpl.java---------------------------------

package sample01;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

//@Component  //bean생성하렴~(객체생성ㄱㄱ)
public class MessageBeanImpl implements MessageBean {
   
   private String fruit;
   private int cost;
   private int qty;
   
   //Constructor Injection
   public MessageBeanImpl(@Value("사과")String fruit) {
      super();  //부모님모시고와~
      this.fruit = fruit;
   }
   
   //Setter Injection
   @Autowired  //요걸 써줘야 호출이됨(자동임)
   public void setCost(@Value("5000")int cost) {
      this.cost = cost;
   }

   @Autowired
   public void setQty(@Value("3")int qty) {
      this.qty = qty;
   }

   @Override
   public void sayHello() {
      System.out.println(fruit + "\t" + cost + "\t" + qty);
      
   }

   @Override
   public void sayHello(String fruit, int cost) {
      System.out.println(fruit + "\t" + cost + "\t" + qty);
      
   }

   @Override
   public void sayHello(String fruit, int cost, int qty) {
      System.out.println(fruit + "\t" + cost + "\t" + qty);
      
   }

}

---------------------------------SpringConfiguration.java---------------------------------

package spring.conf;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import sample01.MessageBeanImpl;

@Configuration // 스프링 설정파일로 쓰려고 만듬 - bean을 설정할 수 있는

public class SpringConfiguration {
	
	// 빈 생성 - 빈이라고 알려줘야지 spring과 연결이됨
	/*
	 * @Bean 
	 * public MessageBeanImpl messageBeanImpl(){ 
	 * 		return new MessageBeanImpl("사과"); 
	 *     }
	 */
	
	@Bean(name="messageBeanImpl")
	public MessageBeanImpl getMessageBeanImpl(){
		return new MessageBeanImpl("사과");
	}

}

---------------------------------MessageBeanImpl.java---------------------------------

package sample01;

import lombok.NonNull;
import lombok.RequiredArgsConstructor;
import lombok.Setter;

// @Component -> configuration 해야되서 주석걸었음
@RequiredArgsConstructor
public class MessageBeanImpl implements MessageBean {
	@NonNull
	private String fruit; /* 기본생성자 */
	@Setter
	private int cost; /* setter */
	@Setter
	private int qty; /* setter */

	/*
	 * Constructor Injection fruit 기본생성자 public MessageBeanImpl(@Value("사과") String
	 * fruit) { super(); 부모생성자 this.fruit = fruit;
	 * 
	 * }
	 * 
	 * Setter Injection cost setter
	 * 
	 * @Autowired setter는 자동으로 데이터를 주는 애가 아니여서 왼쪽과 같은 어노테이션을 줌 public void
	 * setCost(@Value("5000") int cost) { this.cost = cost; }
	 * 
	 * qty setter
	 * 
	 * @Autowired public void setQty(@Value("3") int qty) { this.qty = qty; }
	 */

	@Override
	public void sayHello() {
		System.out.println(fruit + "\t" + cost + "\t" + qty);

	}

	@Override
	public void sayHello(String fruit, int cost) {
		System.out.println(fruit + "\t" + cost + "\t" + qty);

	}

	@Override
	public void sayHello(String fruit, int cost, int qty) {
		System.out.println(fruit + "\t" + cost + "\t" + qty);

	}

}

※ Constructor Injection

--------------------------------Calc.interface--------------------------------
package sample02;

public interface Calc {

	public void calculate();
}
--------------------------------CalcAdd.java--------------------------------

package sample02;

import lombok.AllArgsConstructor;

@AllArgsConstructor
public class CalcAdd implements Calc {

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

}

--------------------------------CalcMul.java--------------------------------

package sample02;

import lombok.Setter;

public class CalcMul implements Calc {
	@Setter
	private int x,y;	
	
	/*
	 * public void setX(int x) {
	 *  this.x = x; }
	 * 
	 * public void setY(int y) {
	 *  this.y = y; }
	 */

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

	}

}

--------------------------------ApplicationContext.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">

<!-- smaple01
<bean id="messageBeanImpl" class="sample01.MessageBeanImpl">
	<constructor-arg>
		<value>사과</value>
	</constructor-arg>
	
	<property name="cost">
		<value>5000</value>
	</property>
	<property name="qty" value="3"></property>
</bean> 
-->

<!-- sample02 -->

<!-- Constructor는 값을 주어야함 -->
<bean id="clacAdd" class="sample02.CalcAdd">
	<constructor-arg value="25"/>
	<constructor-arg value="36"/>
</bean>

<!-- Setter 요청 할 수 있도록 property -->
<bean id="clacMul" class="sample02.CalcMul">
	<property name="x" value="25"/>
	<property name="y" value="36"/>
</bean>

</beans>

--------------------------------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 applicationContext = new ClassPathXmlApplicationContext("ApplicationContext.xml");
		
		Calc calc ;
		calc = applicationContext.getBean("calcAdd", Calc.class);
		calc.calculate();

		calc = (Calc)applicationContext.getBean("calcMul");
		calc.calculate();
	}

}

※ annotation Injection

--------------------------------Calc.interface--------------------------------
package sample02;

public interface Calc {

	public void calculate();
}
--------------------------------CalcAdd.java--------------------------------

package sample02;

import org.springframework.beans.factory.annotation.Value;


// @Component
public class CalcAdd implements Calc {

	private int x;
	private int y;
	
	public CalcAdd(@Value("25") int x, @Value("36") int y) {
		
		super(); /* 생성자가 부모 생성자를 부를 때는 무조건 첫째줄 */
		System.out.println("CalcAdd의 기본 생성자");
		this.x = x; 
		this.y = y; 
	}

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

}

--------------------------------CalcMul.java--------------------------------

package sample02;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;


// @Component 는 바로 밑에 있는 클래스 생성
public class CalcMul implements Calc {
	
	private int x,y;	
	
	public CalcMul() {
		System.out.println("CalcMul의 기본 생성자");
	}
	
	@Autowired
	 public void setX(@Value("25") int x) {
		 this.x = x; 
	}
	
	@Autowired
	 public void setY(@Value("36") int y) {
		 this.y = y; 
	}
	 

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

	}

}

--------------------------------ApplicationContext.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">

<!-- 
<bean id="messageBeanImpl" class="sample01.MessageBeanImpl">
	<constructor-arg>
		<value>사과</value>
	</constructor-arg>
	
	<property name="cost">
		<value>5000</value>
	</property>
	<property name="qty" value="3"></property>
</bean> 
-->
	
<context:component-scan base-package="sample01"></context:component-scan>
<context:component-scan base-package="sample02"></context:component-scan>
<context:component-scan base-package="spring.conf"></context:component-scan>
</beans>

--------------------------------SpringConfiguration.java--------------------------------

package spring.conf;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import sample01.MessageBeanImpl;
import sample02.CalcAdd;
import sample02.CalcMul;

@Configuration // 스프링 설정파일로 쓰려고 만듬 - bean을 설정할 수 있는

public class SpringConfiguration {
	
	// 빈 생성 - 빈이라고 알려줘야지 spring과 연결이됨
	/*
	 * @Bean 
	 * public MessageBeanImpl messageBeanImpl(){ 
	 * 		return new MessageBeanImpl("사과"); 
	 *     }
	 */
	
	@Bean(name="messageBeanImpl")
	public MessageBeanImpl getMessageBeanImpl(){
		return new MessageBeanImpl("사과");
	}
	
	@Bean
	public CalcAdd calcAdd(){
		return new CalcAdd(25, 36);
	}
	
	@Bean(name="calcMul")
	public CalcMul getcalcMul(){
		return new CalcMul();
	}

}

--------------------------------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 applicationContext = new ClassPathXmlApplicationContext("ApplicationContext.xml");
		
		Calc calc ;
		calc = applicationContext.getBean("calcAdd", Calc.class);
		calc.calculate();

		calc = (Calc)applicationContext.getBean("calcMul");
		calc.calculate();
	}

}

※ Constructor Injection

--------------------------------SungJuk.interface--------------------------------

package sample03;

public interface SungJuk {

	public void calcTot(); //총점 계산
    public void calcAvg(); //평균 계산
    public void display(); //출력
    public void modify(); //수정
}

--------------------------------SungJukDTO.java--------------------------------

package sample03;

import lombok.Getter;
import lombok.Setter;

@Getter
@Setter
public class SungJukDTO {
	
	 private String name;
	 private int kor;
	 private int eng;
	 private int math;
	 private int tot;
	 private double avg;

}

--------------------------------ApplicationContext.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">

<!-- sample03 -->
<bean id="sungJukDTO" class="sample03.SungJukDTO">
	<property name="name" value="홍길동"/>
	<property name="kor" value="97"/>
	<property name="eng" value="100"/>
	<property name="math" value="95"/>
</bean>
</beans>

<bean id="sungJukImpl" class="sample03.SungJukImpl">
	<constructor-arg ref="sungJukDTO"/>
</bean>

--------------------------------SungJukImpl.java--------------------------------

package sample03;

import java.util.Scanner;

import lombok.AllArgsConstructor;

@AllArgsConstructor

public class SungJukImpl implements SungJuk {
	
	private SungJukDTO sungJukDTO; // 필드, 초기화 = null
	
	
//	 public SungJukImpl(SungJukDTO sungJukDTO) { 
//	 super(); 
//	 this.sungJukDTO = sungJukDTO;
//	 }
=>  @AllArgsConstructor와 public SungJukImpl 코드 둘중에 하나 써야됨
	
    
	@Override
	public void calcTot() {
		sungJukDTO.setTot(sungJukDTO.getKor() + sungJukDTO.getEng() + sungJukDTO.getMath());
	}

	@Override
	public void calcAvg() {
		sungJukDTO.setAvg(sungJukDTO.getTot()/3.0);
	}

	@Override
	public void display() {
		
		System.out.println("이름\t국어\t영어\t수학\t총점\t평균");
		System.out.println(sungJukDTO);

	}

	@Override
	public void modify() {
		
		Scanner scan = new Scanner(System.in);
		

		System.out.print("이름 입력 : ");
		String name = scan.next();
		System.out.print("국어 입력 : ");
		int kor = scan.nextInt();
		System.out.print("영어 입력 : ");
		int eng = scan.nextInt();
		System.out.print("수학 입력 : ");
		int math = scan.nextInt();
		
		System.out.println();
		
		sungJukDTO.setName(name);
		sungJukDTO.setKor(kor);
		sungJukDTO.setEng(eng);
		sungJukDTO.setMath(math);
		
	}

}

--------------------------------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 applicationContext = new ClassPathXmlApplicationContext("ApplicationContext.xml");
		SungJuk sungJuk = applicationContext.getBean("sungJukImpl", SungJuk.class);
		
		sungJuk.calcTot();
		sungJuk.calcAvg();
		sungJuk.display();		
		
		System.out.println();
		
		sungJuk.modify(); // 수정
		sungJuk.calcTot();
		sungJuk.calcAvg();
		sungJuk.display();

	}

}

※ annotation Injection

--------------------------------SungJukDTO.java--------------------------------

package sample03;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class SungJukDTO {
	
	 private String name;
	 private int kor;
	 private int eng;
	 private int math;
	 private int tot;
	 private double avg;
	
	 
	public String getName() {
		return name;
	}
	@Autowired
	public void setName(@Value("홍길동") String name) {
		this.name = name;
	}
	
	public int getKor() {
		return kor;
	}
	@Autowired
	public void setKor(@Value("97") int kor) {
		this.kor = kor;
	}
	
	public int getEng() {
		return eng;
	}
	@Autowired
	public void setEng(@Value("100") int eng) {
		this.eng = eng;
	}
	public int getMath() {
		return math;
	}
	@Autowired
	public void setMath(@Value("95") int math) {
		this.math = math;
	}
	public int getTot() {
		return tot;
	}
	public void setTot(int tot) {
		this.tot = tot;
	}
	public double getAvg() {
		return avg;
	}
	public void setAvg(double avg) {
		this.avg = avg;
	}

	 @Override
	 public String toString() {
		
		return name + "\t"+ kor +"\t"+ eng +"\t"+ math +"\t"+ tot +"\t"+ String.format("%.2f", avg) ;
		// 이렇게 하면 Impl에서 display()에서처럼 찍을 필요가 없다.
		/*
		System.out.println("이름"+"\t"+"국어"+"\t"+"영어"+"\t"+"수학"+"\t"+"총점"+"\t"+"평균");
		System.out.println(sungJukDTO.getName()+"\t"
						  +sungJukDTO.getKor()+"\t"
						  +sungJukDTO.getEng()+"\t"
						  +sungJukDTO.getMath()+"\t"
						  +sungJukDTO.getTot()+"\t"
						  +String.format("%.2f", sungJukDTO.getAvg()));
		*/
	}
}


--------------------------------ApplicationContext.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="sample03"></context:component-scan>

</beans>


--------------------------------SungJukImpl.java--------------------------------

package sample03;

import java.util.Scanner;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class SungJukImpl implements SungJuk {
	
	// @Autowired : 
	// 생성된 bean들(@component, @Bean) 중에서 SungJukDTO 찾아서 매핑을 해라 
	// - 생성자던 setter 메소드던 상관없이 매핑을 해라(자동 매칭)
	
	@Autowired
	private SungJukDTO sungJukDTO=null; // 필드, 초기화 = null
	
	
	@Override
	public void calcTot() {
		sungJukDTO.setTot(sungJukDTO.getKor() + sungJukDTO.getEng() + sungJukDTO.getMath());
	}

	@Override
	public void calcAvg() {
		sungJukDTO.setAvg(sungJukDTO.getTot()/3.0);
	}

	@Override
	public void display() {
		
		System.out.println("이름\t국어\t영어\t수학\t총점\t평균");
		System.out.println(sungJukDTO);

	}

	@Override
	public void modify() {
		
		Scanner scan = new Scanner(System.in);
		

		System.out.print("이름 입력 : ");
		String name = scan.next();
		System.out.print("국어 입력 : ");
		int kor = scan.nextInt();
		System.out.print("영어 입력 : ");
		int eng = scan.nextInt();
		System.out.print("수학 입력 : ");
		int math = scan.nextInt();
		
		System.out.println();
		
		sungJukDTO.setName(name);
		sungJukDTO.setKor(kor);
		sungJukDTO.setEng(eng);
		sungJukDTO.setMath(math);
		
	}

}
profile
문이빈
이전 포스트

Spring다운

다음 포스트

Spring & JDBC

0개의 댓글