VO (Value Object)
主要对应界面显示的数据对象。对于一个WEB页面，用一个VO对象对应整个界面的值。
简而言之 vo用于想前端展示数据

因为不是所以字段都需要被查出来的 createdTime 和 updateTime 就不需要查询出来 这时候就需要vo了

public class AppUserVO {
    @TableId(value = "id", type = IdType.ASSIGN_ID)
    private String id;

    private String mobile;

    private String nickname;

    private String face;

    private String realname;

    private String email;

    private Integer sex;

    private Date birthday;

    private String province;

    private String city;

    private String district;

    public String getId() {
        return id;
    }

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

    public String getMobile() {
        return mobile;
    }

    public void setMobile(String mobile) {
        this.mobile = mobile;
    }

    public String getNickname() {
        return nickname;
    }

    public void setNickname(String nickname) {
        this.nickname = nickname;
    }

    public String getFace() {
        return face;
    }

    public void setFace(String face) {
        this.face = face;
    }

    public String getRealname() {
        return realname;
    }

    public void setRealname(String realname) {
        this.realname = realname;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public Integer getSex() {
        return sex;
    }

    public void setSex(Integer sex) {
        this.sex = sex;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public String getProvince() {
        return province;
    }

    public void setProvince(String province) {
        this.province = province;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getDistrict() {
        return district;
    }

    public void setDistrict(String district) {
        this.district = district;
    }
}

业务思路:
首先根据userId将数据查出
之后在使用BeanUtils.copyProperties()方法将查出的数据根据字段复制的vo中 然后返回给前端即可

    @Override
    public GraceJSONResult getAccountInfo(String userId) {
        if (StringUtils.isBlank(userId)) {
            return GraceJSONResult.errorCustom(ResponseStatusEnum.UN_LOGIN);
        }
        AppUser appUser = userService.getUser(userId);

        AppUserVO appUserVO = new AppUserVO();

        BeanUtils.copyProperties(appUser, appUserVO);

        return GraceJSONResult.ok(appUserVO);
    }

getUser直接调用mybatis plus的crud方法根据逐渐查询即可

   @Override
   public AppUser getUser(String userId) {
      return userMapper.selectById(userId);
   }