将Scala案例类转换为json

Question

I need to convert scala case class to json. I am using spray json. The problem is my case class having more then 22 fields, and spray json supports to 22 fields only.

I cant write like

implicit val someformat = jsonformat25(Somecaseclass)

case class Color(name: String, red: Int, green: Int, blue: Int)

object MyJsonProtocol extends DefaultJsonProtocol {
  implicit val colorFormat = jsonFormat4(Color)
}

import MyJsonProtocol._
import spray.json._

val json = Color("CadetBlue", 95, 158, 160).toJson
val color = json.convertTo[Color]

I saw there is and tried with it, but it's not working. Please suggest some solution.

implicit object format extends RootJsonFormat[SomeObject] {
    def write(a: SomeObject) = a match {
      case p: SomeObject=> p.toJson
    }
    def read(value: JsValue) = {
      value.convertTo[SomeObject]
    }
  }

Please dont suggest to split class params and make nested case class.. my requirements are I have more than 22 fields in one case class.

Answer 1

You could use - https://github.com/sitetester/json-handler

• It's easy to use and supports converting nested case class(s) into JSON with proper indentation.