@ConfigurationProperties : application.properties파일에 데이터 세팅

@Data
@Slf4j
@Component
@ConfigurationProperties("user") //application.properties파일의 user.xxx을 매핑
public class UserComponent {
	
	private String user_name;
	private int user_age;
	
	public UserComponent() {
		log.info("UserComponent()......");
//		user_name="kim";
//		user_age=5;
	}
	public void start() {
		log.info("start() in TestComponent......");
	}
	@Override
	public String toString() {
		return "UserComponent [user_name=" + user_name + ", user_age=" + user_age + "]";
	}
}