说明：SpringBoot中使用yml文件配置自定义属性，读取配置文件属性注入到实体类中，属性值都为静态属性

配置文件：yml

#用户信息
userMag:
  userName: "王小波"
  userAge: "21"

工具实体类：UserConstant

@Component
public class UserConstant {

    private static String userName;

    @Value("${userMag.userName}")
    private void setUserName(String userName) {//注入值
        UserConstant.userName = userName;
    }

    public static String getUserName() {//获取值
        return userName;
    }

    private static String userAge;

    @Value("${userMag.userAge}")
    private void setUserAge(String userAge) {//注入值
        UserConstant.userAge = userAge;
    }

    public static String getUserAge() {//获取值
        return userAge;
    }
}

项目启动，属性调用

控制台结果输出