JSON序列化程序中数据时间的自定义写入

如何在DateTime的JSON序列化程序中获得自定义行为？ 我的目标是只把这一年连载起来

这是我的模型：

case class Model(id: Option[Int], name: String, userID: String, date: DateTime, material: String, location: String, text: String, pathObject: Option[String], pathTexure: Option[String], pathThumbnail: Option[String])

object Model {
  implicit val tswrites: Writes[DateTime] = Writes { (dt: DateTime) => JsString(dt.year.get.toString) }

  implicit val modelWrites: Writes[Model] = (
    (JsPath \ "id").write[Option[Int]] and
    (JsPath \ "name").write[String] and
    (JsPath \ "userId").write[String] and
    (JsPath \ "date").write[DateTime] and
    (JsPath \ "material").write[String] and
    (JsPath \ "location").write[String] and
    (JsPath \ "text").write[String] and
    (JsPath \ "f1").write[Option[String]] and
    (JsPath \ "f2").write[Option[String]] and
    (JsPath \ "f3").write[Option[String]])(unlift(models.Model.unapply))
}

日期字段序列化为631148400000

所需的日期字段序列化为1990，我已经解决了它

以下是解决方案：

object Model {

  implicit val tswrites: Writes[DateTime] = Writes { (dt: DateTime) => JsString(dt.year.get.toString) }

  implicit val modelWrites: Writes[Model] = (
    (JsPath \ "id").write[Option[Int]] and
    (JsPath \ "name").write[String] and
    (JsPath \ "userId").write[String] and
    Writes.at[DateTime]((JsPath \ "date"))(tswrites) and
    (JsPath \ "material").write[String] and
    (JsPath \ "location").write[String] and
    (JsPath \ "text").write[String] and
    (JsPath \ "f1").write[Option[String]] and
    (JsPath \ "f2").write[Option[String]] and
    (JsPath \ "f3").write[Option[String]])(unlift(models.Model.unapply))

}