SpringBoot yml配置文件调用过程解析

//普通格式
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

//yml格式
spring:
 datasource:
  driver-class-name: com.mysql.jdbc.Driver

@Value("${offcn_ip}")
 private String port;
 @RequestMapping("/one")
 public String getOne(){
   return port;
 }

user:
 username: zhangsan
 age: 23
 id: 1

@ConfigurationProperties(prefix = "user")
public class User {
  private String username;
  private Integer age;
  private Integer id;

  public void setUsername(String username) {
    this.username = username;
  }

  public String getUsername() {
    return username;
  }

  public Integer getAge() {
    return age;
  }

  public void setAge(Integer age) {
    this.age = age;
  }

  public Integer getId() {
    return id;
  }

  public void setId(Integer id) {
    this.id = id;
  }

  @Override
  public String toString() {
    return "User{" +
        "name='" + username + '\'' +
        ", age=" + age +
        ", id=" + id +
        '}';
  }
}

@RestController
@EnableConfigurationProperties({User.class})
public class Yml {
　　@Autowired
  User user;
  @RequestMapping("/one")
  public String getOne(){
    return user.toString();
  }
}