<!--    父工程为springboot项目-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <version>1.5.3.RELEASE</version>
    </parent>
    <dependencies>
        <!--        springboot依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>1.5.3.RELEASE</version>
        </dependency>
    </dependencies>
    <!--    插件-->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

@SpringBootApplication
public class MainApplication {
    public static void main(String[] args) {
        SpringApplication.run(MainApplication.class);
    }
}

##指定使用哪个配置文件
spring:
  profiles:
    active: dev

配置问件中添加配置
my:
  name: king james
  age: 33
  number: ${}
  uuid: ${random.uuid}
  max: ${(10)}
  value: ${random.value}
  greeting: hi,i'm  ${}

//加载配置自动注入类中，参数为前缀；或者使用@Value注解为每个属性去注入配置
@ConfigurationProperties(prefix = "my")
@Component
public class Play {
    private String name;
    private int age;
    private int number;
    private String uuid;
    private int max;
    private String value;
}

@Component：把实体类交给spring容器管理。或者在启动类使用注解@ComponentScan()去自动扫描
实体类并加载，建议用后者，不用每个实体类都配置。