Question

我试图通过酸洗将joda DateTime实例发送到json或从json中取出。酸洗0.8.0，如果我不提供自定义选择器，我会得到

JSONPickle({
  "tpe": "org.joda.time.DateTime"
})

当我这样做时：

class DateTimePickler(implicit val format: PickleFormat) extends
  SPickler[DateTime] with Unpickler[DateTime] {
    private val stringUnpickler = implicitly[Unpickler[String]]

    def pickle(picklee: DateTime, builder: PBuilder): Unit = {
      builder.beginEntry(picklee)
      builder.putField("date", b =>
        b.hintTag(stringTag).beginEntry(picklee.toString).endEntry()
      )
      builder.endEntry()
    }

    override def unpickle(tag: => FastTypeTag[_], reader: PReader): DateTime = {
      reader.hintTag(stringTag)
      val tag = reader.beginEntry()
      logger.debug(s"tag is ${tag.toString}")
      val value = stringUnpickler.unpickle(tag, reader).asInstanceOf[String] //can't debug NoSuchElementException: : key not found: value
      logger.debug(s"value is $value")
      reader.endEntry()

      val timeZone = DateTimeZone.getDefault
      DateTime.parse(value).withZone(timeZone) //otherwise the parsed DateTime won't equal the original
    }
  }

  implicit def genDateTimePickler(implicit format: PickleFormat) = new DateTimePickler

我得到了

JSONPickle({
  "tpe": "org.joda.time.DateTime",
  "date": {
    "tpe": "java.lang.String",
    "value": "2014-09-16T17:59:25.865+03:00"
  }
})

和unpickling失败，出现NoSuchElementException :: key not found：value。随着酸洗0.9.0-SNAPSHOT我的specs2测试甚至终止了。

Answer 1

目前，酸洗缺乏文档和无法提供的错误消息。无论如何，我的unpickle方法被编写为类似于this answer，它假设二进制序列化。通过反复试验找到的正确的unpickle方法如下所示：

override def unpickle(tag: => FastTypeTag[_], reader: PReader): DateTime = {
  val dateReader = reader.readField("date")
  val tag = dateReader.beginEntry()
  val value = stringUnpickler.unpickle(tag, dateReader).asInstanceOf[String]
  dateReader.endEntry()

  val timeZone = DateTimeZone.getDefault
  DateTime.parse(value).withZone(timeZone) //otherwise the parsed DateTime won't equal the original
}

自定义unpickler失败，出现＆＃34; NoSuchElementException :: key not found：value＆＃34;

1 个答案: