3.配置文件

#springboot的核心配置文件
#更改端口号
server:
  port: 8081
#普通的key-value
name: wu
#对象
stu:
  name: wu
  age: 1
#行内写法
student: {name: wu,age: 3}
#数组
pets:
  - cat
  - dog
  - pig
#行内写法
petss: [cat,dog,pig]

@Component
public class Dog {
    @Value("旺财")
    private String name;
    @Value("3")
    private Integer age;}

@SpringBootTest
class DemoApplicationTests {
    @Autowired
    private Dog dog;
    @Autowired
    private Person person;
    @Test
    void contextLoads() {
        System.out.println(dog);
        System.out.println(person);
    }
}

server:
  port: 8081
person:
  name: wu
  age: 3
  happy: false
  birth: 2019/11/02
  maps: {k1: v1,k2: v2}
  lists:
    - code
    - music
    - girl
  dog:
    name: xiaoliu
    age: 4

server:
  port: 8081
person:
  name: wu${random.uuid}
  age: ${random.int}
  happy: false
  birth: 2019/11/02
  maps: {k1: v1,k2: v2}
  lists:
    - code
    - music
    - girl
  dog:
    name: xiaoliu
    age: 4

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
        </dependency>