@Configuration
@ConfigurationProperties(prefix = "coffer")
@PropertySource("classpath:config/coffer.properties")
public class Coffer {
  private String brand;
  private Double length;
  private Double width;
  private Double height;          //省略了get/set方法
  private String[] contains;
  private ArrayList<Fruit> fruits;
  private HashMap<String,Object> map;
}

@Configuration
@ConfigurationProperties(prefix = "coffer.fruits")
@PropertySource("classpath:config/coffer.properties")
public class Fruit {
  private String fruitName;
  private String fruitColor;        //省略了get/set方法 
}

coffer.brand=Camel
coffer.length=100.00
coffer.width=80.00
coffer.height=60.00
coffer.contains[0]=Raincoat
coffer.contains[1]=trousers
coffer.contains[2]=hat
coffer.contains[3]=glove
coffer.contains[4]=scarf
coffer.contains[5]=hood
coffer.fruits[0].fruitName=apricot
coffer.fruits[0].fruitColor=yellow
coffer.fruits[1].fruitName=plum
coffer.fruits[1].fruitColor=green
coffer.fruits[2].fruitName=pineapple
coffer.fruits[2].fruitColor=yellow
coffer.fruits[3].fruitName=watermelon
coffer.fruits[3].fruitColor=green
coffer.fruits[4].fruitName=strawberry
coffer.fruits[4].fruitColor=red
coffer.map.name=xiaomao
coffer.map.age=22
coffer.map.gender=female

@SpringBootTest
class SpringbootApplicationTests {

  @Autowired
  private ApplicationContext ioc;

  @Autowired
  private Coffer coffer;

  @Test
  public void springbootTest(){
    System.out.println(coffer);
  }
}

Coffer{
　　brand='Camel', 
　　length=100.0, 
　　width=80.0, 
　　height=60.0, 
　　contains=[Raincoat, trousers, hat, glove, scarf, hood], 
　　fruits=[
　　　　　　 Fruit{fruitName='apricot', fruitColor='yellow'}, 
　　　　　　 Fruit{fruitName='plum', fruitColor='green'}, 
　　　　　　 Fruit{fruitName='pineapple', fruitColor='yellow'}, 
　　　　　　 Fruit{fruitName='watermelon', fruitColor='green'}, 
　　　　　　 Fruit{fruitName='strawberry', fruitColor='red'}
　　　　　　], 
　　map={age=22, gender=female, name=xiaomao}}

@PropertySource("classpath:config/coffer.properties")
@RestController
public class SpringbootController {

  @Value("${coffer.brand}")
  private String brand;
  @Value("${coffer.height}")
  private Double height;

  @RequestMapping("/test")
  public String springbootTest() {
    return brand+"====="+height;
  }
}