@ConfigurationProperties

作用：

将配置文件中配置的每一个属性的值映射到这个组件中；
告诉spring boot将本类中的所有属性和配置文件中的相关配置进行绑定。
参数：prefix=“person” 将配置文件中的person和下面所有的属性一一对应
只有组件在容器中（@Component）才能使用@ConfigurationProperties功能

yaml:

person:
  name: tom
  age: 5
  happy: true
  birthday: 2015/10/10
  map: {k1: v1,k2: v2}
  list:
    - l1
    - l2
    - l3
  dog:
    name: 旺财
    age: 3

@Component
@ConfigurationProperties(prefix = "person")
@Data
public class Person {

    private String name;
    private Integer age;
    private Boolean happy;
    private Date birthday;
    private Map<String,Object> map;
    private List<Object> list;
    private Dog dog;

}

@Component
@Data
public class Dog {
    private String name;
    private int age;
}

@SpringBootTest
class Springboot01ApplicationTests {

    @Autowired
    Person person;

    @Test
    void contextLoads() {
        System.out.println(person);
    }
}
*****************************结果：****************************
Person(name=tom, 
age=5,
happy=true, 
birthday=Sat Oct 10 00:00:00 CST 2015, 
map={k1=v1, k2=v2}, 
list=[l1, l2, l3], 
dog=Dog(name=旺财, age=3))