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자바과정/스프링

스프링 실습 예제코드

by Parkej 2021. 4. 5.
- Spring project name : FirstMVC 
- 디렉터리 구조

 

 

 

Calculator.java
package com.javalec.ex;

public class Calculator {

	public Calculator() {

	}

	public void addition(int f, int s) {
		int result = f + s;
		System.out.println(f + " + " + s + " = " + result);
	}

	public void subtraction(int f, int s) {
		int result = f - s;
		System.out.println(f + " - " + s + " = " + result);
	}

	public void multiplication(int f, int s) {
		int result = f * s;
		System.out.println(f + " * " + s + " = " + result);
	}

	public void division(int f, int s) {
		int result = f / s;
		System.out.println(f + " / " + s + " = " + result);
	}
}

 

MainClass.java
package com.javalec.ex;

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

public class MainClass {
	public static void main(String[] args) {
//		Calculator calculation = new Calculator();
//		calculation.setFirstnum(10);
//		calculation.setSecondnum(2);
//		
//		calculation.addition();
//		calculation.subtraction();
//		calculation.multiplication();
//		calculation.division();
		
//		MyCalculator myCalculator = new MyCalculator(new Calculator());
//		myCalculator.setCalculator(new Calculator()); // DI 의존성 주입
//		
//		myCalculator.setFirstNum(10);
//		myCalculator.setSecondNum(2);
//		
//		myCalculator.add();
//		myCalculator.sub();
//		myCalculator.mul();
//		myCalculator.div();
		
		String configLocation = "classpath:applicationCTX.xml";
		AbstractApplicationContext ctx = new GenericXmlApplicationContext(configLocation);
		
		MyCalculator myCalculator = ctx.getBean("myCalculator", MyCalculator.class);
		
		myCalculator.add();
		myCalculator.sub();
		myCalculator.mul();
		myCalculator.div();
	}
}

 

MyCalculator
package com.javalec.ex;

public class MyCalculator {
	Calculator calculator;
	private int firstNum;
	private int secondNum;

//	public MyCalculator(Calculator calculator) {
//		this.calculator = calculator;
//	}

	public void add() {
		calculator.addition(firstNum, secondNum);
	}
	public void sub() {
		calculator.subtraction(firstNum, secondNum);
	}
	public void mul() {
		calculator.multiplication(firstNum, secondNum);
	}
	public void div() {
		calculator.division(firstNum, secondNum);
	}


	public void setFirstNum(int firstNum) {
		this.firstNum = firstNum;
	}

	public void setCalculator(Calculator calculator) {
		this.calculator = calculator;
	}

	public void setSecondNum(int secondNum) {
		this.secondNum = secondNum;
	}
	
}

 

applicationCTX
<?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="calculator" class="com.javalec.ex.Calculator" />

	<bean id="myCalculator" class="com.javalec.ex.MyCalculator">
		<property name="calculator">
			<ref bean="calculator" />
		</property>
		<property name="firstNum" value="10" />
		<property name="secondNum" value="2"></property>
	</bean>

</beans>

실행결과

- Spring project name : secondMVC 

- 디렉터리 구조

 

BMICalculator.java
package com.javalec.ex;

public class BMICalculator {

	private double lowWeight;
	private double normal;
	private double overWeight;
	private double obesity;
	
	public void bmicalculation(double weight, double height) {
		
		double h = height * 0.01 ;
		double result = weight / (h*h);
		
		System.out.println("BMI 吏��닔 : " + (int)result);
		
		if(result > obesity) {
			System.out.println("鍮꾨쭔 �엯�땲�떎.");
		} else if(result > overWeight) {
			System.out.println("怨쇱껜以� �엯�땲�떎.");
		}else if(result > normal) {
			System.out.println("�젙�긽 �엯�땲�떎.");
		}else {
			System.out.println("��泥댁쨷 �엯�땲�떎.");
		}
	}

	public void setLowWeight(double lowWeight) {
		this.lowWeight = lowWeight;
	}

	public void setNormal(double normal) {
		this.normal = normal;
	}

	public void setOverWeight(double overWeight) {
		this.overWeight = overWeight;
	}

	public void setObesity(double obesity) {
		this.obesity = obesity;
	}
	
	
	
}

 

MainClass.java
package com.javalec.ex;

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

public class MainClass {

	public static void main(String[] args) {
		String configLocation = "classpath:applicationCTX.xml";
		AbstractApplicationContext ctx = new GenericXmlApplicationContext(configLocation);

		MyInfo myInfo = ctx.getBean("myInfo",MyInfo.class);
		myInfo.getInfo();
		ctx.close();
	}
}

 

MyInfo.java
package com.javalec.ex;

import java.util.ArrayList;

public class MyInfo {
	private String name;
	private double height;
	private double weight;
	private ArrayList<String> hobbys;
	private BMICalculator bmiCalculator;
	
	
	public BMICalculator getBmiCalculator() {
		return bmiCalculator;
	}
	public void setBmiCalculator(BMICalculator bmiCalculator) {
		this.bmiCalculator = bmiCalculator;
	}
	public void setName(String name) {
		this.name = name;
	}
	public void setHeight(double height) {
		this.height = height;
	}
	public void setWeight(double weight) {
		this.weight = weight;
	}
	public void setHobbys(ArrayList<String> hobbys) {
		this.hobbys = hobbys;
	}
	
	public void bmiCalculation() {
		bmiCalculator.bmicalculation(weight, height);
	}
	
	public void getInfo() {
		System.out.println("이름 : " + name);
		System.out.println("키 : " + height);
		System.out.println("몸무게 : " + weight);
		System.out.println("취미 : " + hobbys);
		bmiCalculation();

	}
}

 

applicationCTX.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="bmiCalculator" class="com.javalec.ex.BMICalculator" >
   		<property name="lowWeight"><value>18.5</value></property>
   		<property name="normal"><value>23</value></property>
   		<property name="overWeight"><value>25</value></property>
   		<property name="obesity"><value>30</value></property>
   </bean>
   
	<bean id="myInfo" class="com.javalec.ex.MyInfo">
   
      <property name="name">
      	<value>홍길동</value>
      </property>
      <property name="height" value="187" />
      <property name="weight" value="84"></property>
      <property name="hobbys">
      <list>
      	<value>수영</value>
      	<value>요리</value>
      	<value>독서</value>
      </list>
      </property>
      <property name="bmiCalculator">
      	<ref bean="bmiCalculator"/>
      </property>
   </bean>

</beans>

실행결과

 

- Spring project name : ThirdMVC 

- 디렉터리 구조

 

MainClass.java
package com.javalec.ex;

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

public class MainClass {
	public static void main (String[] args) {
		String configLocation = "classpath:applicationCTX.xml";
		AbstractApplicationContext ctx = new GenericXmlApplicationContext(configLocation);
		
		StudentInfo studentInfo = ctx.getBean("studentInfo", StudentInfo.class);
		studentInfo.getStudentInfo();
		
		Student student2 = ctx.getBean("student2", Student.class);
		studentInfo.setStudent(student2);
		studentInfo.getStudentInfo();
		
		ctx.close();
		
	}
}

 

Student.java
package com.javalec.ex;

public class Student {
	private String name;
	private String age;
	private String gradeNum;
	private String classNum;
	
	public Student(String name,String age,String gradeNum, String classNum) {
		this.name = name;
		this.age = age;
		this.gradeNum = gradeNum;
		this.classNum = classNum;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getAge() {
		return age;
	}

	public void setAge(String age) {
		this.age = age;
	}

	public String getGradeNum() {
		return gradeNum;
	}

	public void setGradeNum(String gradeNum) {
		this.gradeNum = gradeNum;
	}

	public String getClassNum() {
		return classNum;
	}

	public void setClassNum(String classNum) {
		this.classNum = classNum;
	}
	
	
}

 

StudentInfo.java
package com.javalec.ex;

public class StudentInfo {
	private Student student;
	
	public StudentInfo(Student student) {
		this.student = student;
	}
	
	public void getStudentInfo() {
		if(student != null) {
			System.out.println("이름 : " + student.getName());
			System.out.println("나이 : " + student.getAge());
			System.out.println("학년 : " + student.getGradeNum());
			System.out.println("반 : " + student.getClassNum());
			System.out.println("======================");
		}
	}
	
	public void setStudent(Student student) {
		this.student = student;
	}
}

 

applicationCTX.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="student1" class = "com.javalec.ex.Student">
	<constructor-arg>
		<value>홍길동</value>
	</constructor-arg>
	
	<constructor-arg>
		<value>10살</value>
	</constructor-arg>
	
	<constructor-arg>
		<value>3학년</value>
	</constructor-arg>
	
	<constructor-arg>
		<value>20번</value>
	</constructor-arg>
	</bean>
	
	<bean id="student2" class = "com.javalec.ex.Student">
		<constructor-arg value="홍길동"/>
		<constructor-arg value="9살"/>
		<constructor-arg value="2학년"/>
		<constructor-arg value="10번"/>
	</bean>
	
	<bean id="studentInfo" class = "com.javalec.ex.StudentInfo">
		<constructor-arg>
			<ref bean="student1"/>
		</constructor-arg>
	</bean>
</beans>

실행결과

- Spring project name : FMVC 

- 디렉터리 구조

 

MainClass.java
package com.javalec.ex;

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

public class MainClass {

	public static void main(String[] args) {
		AbstractApplicationContext ctx = new GenericXmlApplicationContext("classpath:applicationCTX.xml");
		
		Pencil pencil = ctx.getBean("pencil",Pencil.class);
		pencil.use();
		ctx.close();
	}

}

 

Pencil.java
package com.javalec.ex;

public interface Pencil {
	public void use(); // 추상메서드
}

 

Pencil4B.java
package com.javalec.ex;

public class Pencil4B implements Pencil{

	public void use() {
		System.out.println("4B 굵기로 쓰인다.");
	}

}

 

Pencil6B.java
package com.javalec.ex;

public class Pencil6B implements Pencil{

	@Override
	public void use() {
		System.out.println("6B 굵기로 쓰인다.");
		
	}

}

 

Pencil6BWithEraser.java
package com.javalec.ex;

public class Pencil6BWithEraser extends Pencil6B implements Pencil {
	
	@Override
	public void use() {
		super.use();
		System.out.println("6B 굵기로 쓰이고, 지우개가 있다.");
		
	}
}

 

applicationCTX.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 = "pencil" class="com.javalec.ex.Pencil6BWithEraser"/>
</beans>

 Spring project name : TestMVC 


- 디렉터리 구조

 

Family.java
package com.javalec.ex;

public class Family {
	String papaName; // 생성자를 통한 초기화
	String mamiName;
	String sisterName; // 세터를 통한 초기화
	String brotherName;
	
	public Family(String papaName, String mamiName) {
		this.papaName = papaName;
		this.mamiName = mamiName;
	}

	public String getPapaName() {
		return papaName;
	}

	public void setPapaName(String papaName) {
		this.papaName = papaName;
	}

	public String getMamiName() {
		return mamiName;
	}

	public void setMamiName(String mamiName) {
		this.mamiName = mamiName;
	}

	public String getSisterName() {
		return sisterName;
	}

	public void setSisterName(String sisterName) {
		this.sisterName = sisterName;
	}

	public String getBrotherName() {
		return brotherName;
	}

	public void setBrotherName(String brotherName) {
		this.brotherName = brotherName;
	}
	
}

 

MainClass.java
package com.javalec.ex;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.GenericXmlApplicationContext;

import com.javalec.ex.Family;
import com.javalec.ex.Student;
import com.javalec.ex.StudentInfo;

public class MainClass {

	public static void main(String[] args) {
		String configLocation1 = "classpath:applicationCTX.xml";
		String configLocation2 = "classpath:applicationCTX1.xml";
		AbstractApplicationContext ctx 
		= new GenericXmlApplicationContext(configLocation1, configLocation2);
		
		Student student1 = ctx.getBean("student1",Student.class);
		System.out.println(student1.getName()); // 홍길동
		System.out.println(student1.getHobbys()); // 수영 요리
		
		StudentInfo studentInfo = ctx.getBean("studentInfo1", StudentInfo.class);
		Student student2 = studentInfo.getStudent(); // student == student2
		System.out.println(student2.getName()); // 홍길동
		System.out.println(student2.getHobbys()); // 수영 요리
		
		if(student1.equals(student2)) { // student 1과 studentInfo(student2)가 같으면 ref 참조쓰기
			System.out.println("student1 == student2");
		}
		
		Student student3  = ctx.getBean("student3", Student.class);
		System.out.println(student3.getName());
		
		if(student1.equals(student3)) {
			System.out.println("student1 == student3");
		}else {
			System.out.println("student1 != student3");
		}
		
		Family family = ctx.getBean("family", Family.class);
		System.out.println(family.getPapaName());
		System.out.println(family.getMamiName());
		System.out.println(family.getSisterName());
		System.out.println(family.getBrotherName());
		
		ctx.close();
	}

}

 

Student.java
package com.javalec.ex;

import java.util.*;

public class Student {
	private String name;
	private int age;
	private ArrayList<String> hobbys;
	private double height;
	private double weight;
	
	public Student(String name, int age, ArrayList<String> hobbys) {
		this.name = name;
		this.age = age;
		this.hobbys = hobbys;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public ArrayList<String> getHobbys() {
		return hobbys;
	}

	public void setHobbys(ArrayList<String> hobbys) {
		this.hobbys = hobbys;
	}

	public double getHeight() {
		return height;
	}

	public void setHeight(double height) {
		this.height = height;
	}

	public double getWeight() {
		return weight;
	}

	public void setWeight(double weight) {
		this.weight = weight;
	}
	
	
}

 

StudentInfo.java
package com.javalec.ex;

public class StudentInfo {
// 레퍼런스 참조만 되게끔
	private Student student;
	
	public StudentInfo() {
		
	}

	public Student getStudent() {
		return student;
	}

	public void setStudent(Student student) {
		this.student = student;
	}
	
	
}

 

applicationCTX.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:c="http://www.springframework.org/schema/c"
	xmlns:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

	<bean id="studentInfo1" class="com.javalec.ex.StudentInfo">
		<property name="student">
			<ref bean="student1"></ref>
		</property>

	</bean>


	<bean id="student1" class="com.javalec.ex.Student" c:name="홍길동"
		c:age="20">
		<!-- <constructor-arg> <value>홍길동</value> </constructor-arg> <constructor-arg> 
			<value>19</value> </constructor-arg> -->
		<constructor-arg>
			<list>
				<value>수영</value>
				<value>요리</value>
			</list>
		</constructor-arg>
	</bean>




	<bean id="student3" class="com.javalec.ex.Student" c:name="홍길자"
		c:age="30">
		<!-- <constructor-arg> <value>홍길자</value> </constructor-arg> <constructor-arg> 
			<value>30</value> </constructor-arg> -->
		<constructor-arg>
			<list>
				<value>히히</value>
				<value>하하</value>
			</list>
		</constructor-arg>

	</bean>

</beans>

 

applicationCTX1.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:c="http://www.springframework.org/schema/c"
	xmlns:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

	<bean id="family" class="com.javalec.ex.Family" c:papaName="홍아빠"
		c:mamiName="홍엄마" p:sisterName="홍누나" p:brotherName="홍오빠">
		<!-- <constructor-arg> <value>홍아빠</value> </constructor-arg> <constructor-arg> 
			<value>홍엄마</value> </constructor-arg> <property name="sisterName" value="홍누나"/> 
			<property name="brotherName" value="홍오빠"/> -->

	</bean>
</beans>

실행결과

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