2016년 9월 19일 월요일

[자바교육,스프링교육추천◆탑크리에듀]#17.SpEL을 이용한 Value Injection(어노테이션 방식)

#17.SpEL을 이용한 Value Injection(어노테이션 방식)


SpEL 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

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