练习：将从表读出来的时间戳除以1000(java读时间戳会多出3个000)jackson包 实现

entity

@Entity

@DynamicUpdate //自动更新日期

@Data //get/set

public class OrderDetail {

@Id

private String detailId;

/**订单id**/

private String orderId;

/**商品id**/

private String productId;

/**商品名**/

private String productName;

/**商品价格**/

private BigDecimal productPrice;

/**购票数量**/

private Integer productQuantity;

/**商品图片**/

private String productIcon;

/**时间戳**/

private Date createTimestamp;

/**时间戳**/

private Date updateTimestamp;

}

java读出的数据格式,时间戳会精确到毫秒，多出3个000

{

"statusCode": 0,

"message": "返回成功",

"data": [{

"orderId": "1542785381425923730",

"buyerName": "王五",

"buyerPhone": "15605852476",

"buyerAddr": "北京王府井",

"buyerOpenid": "110112",

"buyerAmount": 4.40,

"orderStatus": 0,

"payStatus": 0,

"createTimestamp": 1542794276000,

"updateTimestamp": 1542794276000,

"orderDetailList": null

}]

}

解决方法：

1.继承com.fasterxml.jackson.databind.JsonSerializer;的类，并复写：serialize(T.....)方法

public class DateToTimestamp extends JsonSerializer {

@Override

public void serialize(Date date, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException, JsonProcessingException {

jsonGenerator.writeNumber(date.getTime() / 1000);

}

}

2.在实体类上用上新建的 DateToTimestamp 类的注解

@Entity

@DynamicUpdate //自动更新日期

@Data //get/set

public class OrderMaster {

@Id

private String orderId;

/**买家名字**/

private String buyerName;

/**买家手机**/

private String buyerPhone;

/**买家地址**/

private String buyerAddr;

/**用户openid**/

private String buyerOpenid;

/**订单金额**/

private BigDecimal buyerAmount;

/**订单状态, 默认状态0新订单**/

private Integer orderStatus = OrderStatusEnum.NEW.getCode();

/**支付状态, 默认状态0等待支付**/

private Integer payStatus = PayStatusEnum.WAIT.getCode();

/**

* 此注解表示时间戳除以1000

*/

@JsonSerialize(using = DateToTimestamp.class)

private Date createTimestamp;

/**

* 此注解表示时间戳除以1000

*/

@JsonSerialize(using = DateToTimestamp.class)

private Date updateTimestamp;

}