Scala + Gson

scala-gson.scala

// lib to add: http://code.google.com/p/google-gson/downloads/detail?name=google-gson-2.2.2-release.zip&can=2&q=

// file Main.scala
package demo

import scala.collection.JavaConverters._
import com.google.gson.Gson
import java.util.ArrayList
import java.lang.reflect.Type
import com.google.gson.reflect.TypeToken

object Main {
  def main(args : Array[String]) {
    val gson : Gson = new Gson()
    val list : ArrayList[String] = new ArrayList[String]
    list.add("Dario")
    list.add("Dario2")
    val tmp : MyType = new MyType("A", list)
    
    println("Object :" + tmp)
    
    val json : String = gson.toJson(tmp)
    
    println("Object2json: " + json)
    
    val jsonString = "[{\"x\":\"A\",\"y\":[\"Dario\",\"Dario2\"]}, {\"x\":\"A\",\"y\":[\"Dario\",\"Dario2\"]}]";

    // listType konieczny do odpowiedniego przekonwertowania Jsona przez biblioteke Gson
    val listType : Type = new TypeToken[ArrayList[MyType]]() {}.getType()
    val tmp2 : ArrayList[MyType] = (gson.fromJson(jsonString, listType))
    
    println("Json2object: " + tmp2)
    
  }
}


// file MyType.scala
package demo

import scala.collection.JavaConverters._
import com.google.gson.Gson
import java.util.ArrayList

case class MyType (val x:String, val y:ArrayList[String]) {
   def toJson() = new Gson().toJson(this)
   
   override def toString() : String = {
     x + ", " + y     
   }
}