[자바교육,스프링교육(Spring Framework/Boot)추천_탑크리에듀]#17.SpEL을 이용한 Value Injection(어노테이션 방식)

#17.SpEL을 이용한 Value Injection(어노테이션 방식)

SpEL을 이용한 Value Injection(어노테이션 방식)

[app-context3.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-4.2.xsd

            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd">

<context:annotation-config/>

<context:component-scan base-package="onj.spel.annotation" />

</beans>

[Onj.java]

package onj.spel.injection;

public class Onj {

    private String name="OnJ";

    private String age = "10";

/*

app-context2.xml에서 SpelInjectionExam 에 값을 주입하기 위해 getter만 만듬

#{onj.name} 구문에 의해 getter가 호출되고 그 값이 SpelInjectionExam에 주입된다.

*/

    public String getName() {

        return name;

    }

    public String getAge() {

        return age;

    }

}

[SpelInjectionExam.java]

package onj.spel.annotation;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.context.support.GenericXmlApplicationContext;

import org.springframework.stereotype.Service;

@Service("sample")

public class SpelInjectionExam {

private String name;

private String age;

/*  Onj객체의 getName을 호출해 값을 세팅 */

@Value("#{onj.name}")

public void setName(String name) {

     this.name = name;

}

/*  Onj객체의 getAge를 호출해 값을 세팅 */

@Value("#{onj.age}")

public void setAge(String age) {

this.age = age;

}

public String toString() {

return "This is spel injection example... " + "Your name is " + name + ", age is " + age;

}

public static void main(String[] args) {

GenericXmlApplicationContext ctx = new GenericXmlApplicationContext();

ctx.load("classpath:app-context3.xml");

ctx.refresh();

SpelInjectionExam sample = (SpelInjectionExam) ctx.getBean("sample");

System.out.println(sample);

}

}

[결과]

This is spel injection example... Your name is OnJ age is 10