같은 키의 외부 설정을 묶어서 하나의 bean으로 만드는 방법
@Component
@ConfigurationProperties("cmlee")
public class CmleeProperties {
	private String name;
	private int age;
	private String fullName;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getFullName() {
		return fullName;
	}
	public void setFullName(String fullName) {
		this.fullName = fullName;
	}
}
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-configuration-processor</artifactId>
	<optional>true</optional>
</dependency>
사용
@Component
public class SampleListener implements ApplicationRunner {
	@Autowired
	private CmleeProperties cmleeProperties;
	@Override
	public void run(ApplicationArguments args) throws Exception {
		System.out.println("=============");
		System.out.println(cmleeProperties.getName());
		System.out.println(cmleeProperties.getAge());
		System.out.println("=============");
	}
}
기본적으로 자동으로 정의한 타입으로 컨버전 하여 입력된다.
특별한 시간정보를 위한 타입이 있다.
// CmleeProperties.class
@DurationUnit(ChronoUnit.SECONDS)
private Duration sessionTimeout = Duration.ofSeconds(30);
# application.properties
cmlee.sessionTimeout = 25s