DI 설정 방법 - Java & xml 같이 사용

DI 설정 방법

오늘은 IOC컨테이너 안에 의존하는 객체인 DI를 설정하는 방법을 알아보자 !

총 3가지의 방법이 있다.

1. DI in xml
2. DI in java
3. java 와 xml 같이 사용

 

3. XML과 JAVA를 같이 사용

1. xml파일에 JAVA파일을 포함시켜 사용 하는방법

DI in xml 과 DI in JAVA와 두개 합친거와 거의 동일하지만, xml파일 안에 configuration 어노테이션을 가져오겠다는 명령문 하나를 삽입해야한다.

// Student.java 부터 보자. 이놈 은 어차피 계속 똑같다.
​
import java.util.ArrayList;
​
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;
    }
    
    ==========================================================================
        
    // 다음으로 ApplicationConfig.java ,  DI in JAVA에서 썼던 코드와 동일,  어노테이션 쓰는 거 잘 알아 둘것.
        
    import java.util.ArrayList;
​
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
​
@Configuration
public class ApplicationConfig {
    
    
    @Bean
    public Student student1(){
        
        ArrayList<String> hobbys = new ArrayList<String>();
        hobbys.add("수영");
        hobbys.add("요리");
        
        Student student = new Student("홍길동", 20, hobbys);
        student.setHeight(172);
        student.setWeight(72);
        
        return student;
    }
}
    
     ================================================================================
     
     // 마지막으로 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:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
​
    <context:annotation-config/>
    <bean class="ApplicationConfig"/>
    
    <bean id="student2" class="Student">
        <constructor-arg value ="홍길동"/>
        <constructor-arg value ="27"/>
        <constructor-arg>
            <list>
                <value>게임</value>
                <value>산책</value>
                <value>운동</value>
            </list>
        </constructor-arg>
        
        <property name="height" value="172"/>
        <property name="weight" value="72"/>
    </bean>
    
</beans>
​
 // 기존과 달라진 것은 ApplicatiopConfig.java 에서 어노테이션한 것을 가져와서 사용하겠다는
 // <context:annotation-config/>
 // <bean class="ApplicationConfig"/> 
 // 추가와  이것을 사용하기 위한  xmlns:context="http://www.springframework.org/schema/context"
        
 ==========================================================================================
​

 

 

2. JAVA파일 안에 XML 파일을 가져와 사용하는 방법

xxxxxxxxxx
import java.util.ArrayList;
​
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
​
@Configuration
@ImportResource("classpath:applicationCTX.xml")
public class ApplicationConfig {
    
    
    @Bean
    public Student student1(){
        
        ArrayList<String> hobbys = new ArrayList<String>();
        hobbys.add("수영");
        hobbys.add("요리");
        
        Student student = new Student("홍길동", 20, hobbys);
        student.setHeight(172);
        student.setWeight(72);
        
        return student;
    }
}
​
============================================================================
    
    // 마지막으로 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="student2" class="Student">
        <constructor-arg value ="홍길동"/>
        <constructor-arg value ="27"/>
        <constructor-arg>
            <list>
                <value>게임</value>
                <value>산책</value>
                <value>운동</value>
            </list>
        </constructor-arg>
        
        <property name="height" value="172"/>
        <property name="weight" value="72"/>
    </bean> 
</beans>
​
================================================================================
​
// MainClass.java 이놈은 JAVA파일을 이용할 떄와 같이 MainClass를 만들면 된다.
​
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
​
public class MainClass {
    public static void main(String[] args) {
        
        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(ApplicationConfig.class);
        Student student1 = ctx.getBean("student1", Student.class);
        System.out.println("이름 : " +student1.getName());
        System.out.println("나이 : " +student1.getAge());
        System.out.println("취미 : " +student1.getHobbys());
        System.out.println("신장 : " +student1.getHeight());
        System.out.println("몸무게 : " +student1.getWeight());
        
        Student student2 = ctx.getBean("student2", Student.class);
        System.out.println("이름 : " +student2.getName());
        System.out.println("나이 : " +student2.getAge());
        System.out.println("취미 : " +student2.getHobbys());
        System.out.println("신장 : " +student2.getHeight());
        System.out.println("몸무게 : " +student2.getWeight());
    }
}
​