이클립스 spring maven 프로젝트

 

https://mvnrepository.com/

 

maven context 검색

<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>5.3.10</version>
		</dependency>

maven-compiler-plugin

<dependency>
			<groupId>org.apache.maven.plugins</groupId>
			<artifactId>maven-compiler-plugin</artifactId>
			<version>3.8.1</version>
		</dependency>

 

interface Fuel{
	String getFule();
}

class Water implements Fuel{
	public String getFule() {
		
		return "물";
	}
}
class Airplane{
	Fuel fuel;
	Airplane(Fuel fuel){
		this.fuel = fuel;
	}
	void Fly() {
		System.out.println(fuel + "날다");
	}
}

public class Hello {

	public static void main(String[] args) {
		System.out.println();
		Airplane airplane = new Airplane(new Water());
		airplane.Fly();
		
	}

}

 

 

interface Fuel{
	String getFule();
}

class Water implements Fuel{
	public String getFule() {
		
		return "물";
	}
}
class Airplane{
	Fuel fuel;
	Airplane(Fuel fuel){
		this.fuel = fuel;
	}
	void Fly() {
		System.out.println(fuel + "날다");
	}
}
class Factory{
	
	Airplane makeAirplane() {
		Airplane airplane = new Airplane(new Water());
		return airplane;
	}
}
public class Hello {

	public static void main(String[] args) {
		Airplane airplane = new Factory().makeAirplane();
		airplane.Fly();
		
	}

}

 

interface Fuel{
	String getFule();
}

class Water implements Fuel{
	public String getFule() {
		
		return "물";
	}
}
class Airplane{
	Fuel fuel;
	Airplane(Fuel fuel){
		this.fuel = fuel;
	}
	void Fly() {
		System.out.println(fuel + "날다");
	}
}
class Ship{
	Fuel fuel;
	Ship(Fuel fuel){
		this.fuel = fuel;
	}

}
class Car{
	Fuel fuel;
	Car(Fuel fuel){
		this.fuel = fuel;
	}

}
class Factory{	
	Fuel makefuel() {
		return new Water();
	}
	Airplane airplane() {		
		return new Airplane(makefuel());
	}
	Ship ship() {		
		return new Ship(makefuel());
	}
	Car car() {
		return new Car(makefuel());		

	}
}

 

interface Fuel{
	String getFule();
}

class Water implements Fuel{
	public String getFule() {
		
		return "물";
	}
}
class Airplane{
	Fuel fuel;
	Airplane(Fuel fuel){
		this.fuel = fuel;
	}
	void Fly() {
		System.out.println(fuel + "날다");
	}
}
class Ship{
	Fuel fuel;
	Ship(Fuel fuel){
		this.fuel = fuel;
	}

}
class Car{
	Fuel fuel;
	Car(Fuel fuel){
		this.fuel = fuel;
	}

}
@Configuration // 여기 안에 자동으로 객체를 생성해줌 스프링에서 사용
class Factory{	
	@Bean
	Fuel makefuel() {
		return new Water();
	}
	Airplane airplane() {		
		return new Airplane(makefuel());
	}
	Ship ship() {		
		return new Ship(makefuel());
	}
	Car car() {
		return new Car(makefuel());		

	}
}

public class Hello {

	public static void main(String[] args) {
		AnnotationConfigApplicationContext ctx = 
				new AnnotationConfigApplicationContext(Factory.class);
			//Fuel fuel = ctx.getBean("makeFuel",Fuel.class);
			Fuel fuel = (Fuel)ctx.getBean("makeFuel");
			System.out.println(fuel.getFule());
			//Airplane airplane = new Factory().airplane(); 밑에있는 로직과 같은 방식
			Airplane airplane = ctx.getBean("airplane",Airplane.class);
			airplane.Fly();
			
			ctx.close();
	}

}

 

interface Fuel{
	String getFuel();
}

class Water implements Fuel{
	public String getFuel() {
		return "물";
	}
}

class Gas implements Fuel{
	public String getFuel() {
		return "가스";
	}
}

class Airplane{
	Fuel fuel;
	Airplane(Fuel fuel) {
		this.fuel = fuel;
	}
	void fly() {
		System.out.println(fuel.getFuel() + " 로 날다");
	}
}

class Ship{
	Fuel fuel;
	Ship(Fuel fuel) {
		this.fuel = fuel;
	}
	void fly() {
		System.out.println(fuel.getFuel() + " 로 간다");
	}
}

class Car{
	Fuel fuel;
	Car(Fuel fuel) {
		this.fuel = fuel;
	}
	void fly() {
		System.out.println(fuel.getFuel() + " 로 달린다");
	}
}

public class Hello {

	public static void main(String[] args) {
		System.out.println(1);

		// 외부에 있는 xml파일 가져오는 방법
		// 밑에 GenericXmlApplicationContext 써주고
		// xml파일 이름 적기
		GenericXmlApplicationContext ctx = new GenericXmlApplicationContext("Context.xml");
		
		Airplane airplane = ctx.getBean("airplane", Airplane.class);
		airplane.fly();
		
		Ship ship = ctx.getBean("ship", Ship.class);
		ship.fly();
		
		Car car = ctx.getBean("car", Car.class);
		car.fly();
		
		ctx.close();
		
				
	}

}

 

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       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 
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
       
       <!-- 
	       @Bean
	       Fuel makeFuel(){
	       	return new Water();
	       } 
       -->
       <!-- makeFuel함수를 만들고 리턴값은 Water객체이다. -->
       <bean id="makeFuel" class="pack.Water" />
       <bean id="makeGas" class="pack.Gas" />
       
	    <!--    
		    @Bean
			Airplane airplane() {
				return new Airplane(makeFuel());
			} 
		-->
		<bean id="airplane" class="pack.Airplane">
			<constructor-arg ref="makeFuel"/>
		</bean>
		<bean id="ship" class="pack.Ship">
			<constructor-arg ref="makeGas"/>
		</bean>
		<bean id="car" class="pack.Car">
			<constructor-arg ref="makeGas"/>
		</bean>
		<bean id="UserDao" class="pack.Car">
			<constructor-arg ref="makeGas"/>
		</bean>
		<bean id="MessageDao" class="pack.Car">
			<constructor-arg ref="makeGas"/>
		</bean>
		<bean id="PrintDao" class="pack.Car">
			<constructor-arg ref="makeGas"/>
		</bean>
</beans>

Context.xml