DATA时间：若是数据库存储的为毫秒，而前台需要的是秒，下面介绍一个工具类：

工具类：

public class Date2LongSerializer extends JsonSerializer<Date> {

    @Override
    public void serialize(Date date, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException, JsonProcessingException {
        jsonGenerator.writeNumber(date.getTime() / 1000);
    }
}

修改实体类：

@Data
//@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)
//@JsonInclude(JsonInclude.Include.NON_NULL)
public class OrderDTO {

    /** 订单id. */
    private String orderId;

    /** 买家名字. */
    private String buyerName;

    /** 买家手机号. */
    private String buyerPhone;

    /** 买家地址. */
    private String buyerAddress;

    /** 买家微信Openid. */
    private String buyerOpenid;

    /** 订单总金额. */
    private BigDecimal orderAmount;

    /** 订单状态, 默认为0新下单. */
    private Integer orderStatus;

    /** 支付状态, 默认为0未支付. */
    private Integer payStatus;

    /** 创建时间. */
    @JsonSerialize(using = Date2LongSerializer.class)
    private Date createTime;

    /** 更新时间. */
    @JsonSerialize(using = Date2LongSerializer.class)
    private Date updateTime;

    List<OrderDetail> orderDetailList;

    @JsonIgnore
    public OrderStatusEnum getOrderStatusEnum() {
        return EnumUtil.getByCode(orderStatus, OrderStatusEnum.class);
    }

    @JsonIgnore
    public PayStatusEnum getPayStatusEnum() {
        return EnumUtil.getByCode(payStatus, PayStatusEnum.class);
    }
}