是@JsonSerialize注解
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;