Spring xml파일 생성 및 실습하기 - spring_di_01

 

 

 

 

 

package di.hello;

public class EnHello implements Hello{
 public String sayHello(String name){
  return name+"! How are you?";
 }
}

 

package di.hello;

public interface Hello {
 public String sayHello(String name);
}

 

package di.hello;

public class KorHello implements Hello{
 public String sayHello(String name){
  return "안녕하세요"+name+"님!";
 }

}

 

<?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-3.0.xsd">

 <bean name="hello" class="di.hello.KorHello"/>

</beans>

 

package di.main;

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

import di.hello.KorHello;

public class TestHello {
 //Spring Container객체 조회 - 설정파일의 위치를 문자열로 알려준다.
 public static void main(String[] args) {
  ApplicationContext ctx = new ClassPathXmlApplicationContext("di/hello/config/hello.xml");
  Object obj = ctx.getBean("hello");
  KorHello hello = (KorHello)obj;
  String greeting = hello.sayHello("이순신");
  System.out.println(greeting);
 }

}

 

* 결과

 

* 다형성(폴리모피즘)을 이용한 객체 생성(확장성 유연성을 위해 다형성을 활용하여 객체 생성)

<?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-3.0.xsd">

 <bean name="hello" class="di.hello.EnHello"/>

</beans>

 

package di.main;

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

import di.hello.EnHello;
import di.hello.Hello;
import di.hello.KorHello;

public class TestHello {
 //Spring Container객체 조회 - 설정파일의 위치를 문자열로 알려준다.
 public static void main(String[] args) {
  ApplicationContext ctx = new ClassPathXmlApplicationContext("di/hello/config/hello.xml");
  Object obj = ctx.getBean("hello");
  Hello hello = (Hello)obj;
  String greeting = hello.sayHello("이순신");
  System.out.println(greeting);
 }

}

* 결과