JSon-Scala - Parse list

问题

I have problem parsing JSon into RDD

{"data":"{\"orderID\":\"3\",\"products\":[{\"productID\":10028,\"category\":\"342\",\"name\":\"Kids Coats\",\"gender\":\"Kids\",\"sport\":\"Basketball\",\"color\":\"Blue\",\"retailPrice\":268.0,\"sellPrice\":268.0,\"sellQuantity\":1,\"taxablePrice\":268.0,\"brand\":\"Inno Fashion\",\"stockQuantity\":999,\"subTotal\":268.0,\"ancesstorCategories\":[\"2426\",\"2454\",\"241\",\"342\",\"24\",\"34\",\"2439\",\"21\",\"3\",\"2\",\"1\",\"2412\",\"2430\",\"2503\"]},{\"productID\":10031,\"category\":\"334\",\"name\":\"Kids Tshirt\",\"gender\":\"Kids\",\"sport\":\"Cycling\",\"color\":\"Blue\",\"retailPrice\":59.0,\"sellPrice\":59.0,\"sellQuantity\":6,\"taxablePrice\":59.0,\"brand\":\"361 Sports\",\"stockQuantity\":994,\"subTotal\":354.0,\"ancesstorCategories\":[\"2426\",\"241\",\"33\",\"24\",\"2429\",\"334\",\"2439\",\"21\",\"3\",\"2\",\"1\",\"2412\",\"2503\",\"2451\"]}}

When I read this information into RDD,

       1.     val content = parse(event.properties.get[String]("data"))
       2.     val productID = (for {JInt(x) <- (content \\ "productID")} yield x.toString())
       3.     val sellProductQuantity = (for {JInt(x) <- (content \\ "sellQuantity")} yield x.toString())
       4.     val category = for { JArray(x) <- (content \\ "ancesstorCategories")} yield x
       5.     val compactProductId = compact(content \\ "productID")


      6.                  yield BuyEvent(
      7.                  user = userID,
      8.                  item = productID(index).toString,
      9.                  category = category(index),
      10.                count = (sellProductQuantity(index).values.toString).toInt)

I got an error at line 9, when processing category I would like to get the 'ancestorCategories' of JSON into the 'category' or RDD like a list List(2426, 2454, 241, 342, 24, 34, 2439, 21, 3, 2, 1, 2412, 2430, 2503)

Error: found : List[org.json4s.JsonAST.JValue] [ERROR] [Console$] [error] required: Array[String]

Can anyone help me to convert from List[org.json4s.JsonAST.JValue] to List[String]? Thank you very much.

回答1:

you could use render to get raw String out of Value

scala> val json = ("name" -> "joe")
scala> compact(render(json))
res1: String = {"name":"joe"}

thus you could:

val category =
  for { JArray(x) <- (content \\ "ancesstorCategories")}
  yield compact(render(x))

I can not run it locally now ,hope it helps.

回答2:

var content = parse(json)
var aarray = ArrayBuffer()
(content \\ "ancesstorCategories").children.foreach(x=>{
aarray+x.toString
})
var list= aarray.toList

I think this might works , as you can do what ever you can in the x=>{} bolock

来源：https://stackoverflow.com/questions/33013037/json-scala-parse-list

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json

scala

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