spring java로 DI

xml이 아닌 @을 이용하여 객체를 주입하겠다.

 

 

Main.java

public class MainClass {

    public static void main(String[] args) {
        AnnotationConfigApplicationContext ctx
                = new AnnotationConfigApplicationContext(AppcationConfig.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());
   }
}

어노테이션을 이용하여 객체를 주입받겠다고 선언함

 

 

AppcationConfig.java

@Configuration
public class AppcationConfig {

    @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(180);
        student.setWeight(70);
        return student;
    }
}

student1 메서드로 student 객체를 반환하여 객체를 넘겨줌 

 

package com.example.xmljava;

import java.util.ArrayList;

public class Student {

    private String name;
    private String age;
    private double height;
    private double weight;
    private ArrayList<String> hobbys;

    public Student(String name, String 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 String getAge() {
        return age;
    }

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

    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;
    }

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

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

실행 결과