CODEWITHSUNDEEP
jsonscala
user443426
user443426

Reputation:

Json parsing in Scala with scala.util.parsing.json

I have a json object "{"id":1,"name":"OZKA","birthDate":"1981-02-08T20:00:00.000Z","monthRevenue":1000.75,"developer":true}" and the code:

println(request.getParameter("content"))//{"id":1,"name":"OZKA","birthDate":"1981-02-08T20:00:00.000Z","monthRevenue":1000.75,"developer":true}
val result = scala.util.parsing.json.JSON.parseFull(request.getParameter("content"))
result match {
  case Some(e) => { println(e); //output: Map(name -> OZKA, monthRevenue -> 1000.75, developer -> true, birthDate -> 1981-02-08T20:00:00.000Z, id -> 1.0)
    e.foreach((key: Any, value: Any) => {println(key + ":" + value)})
  }
  case None => println("Failed.")
}

, when I try to call map or foreach function, compiler throws an error "value foreach is not a member of Any". Can anybody suggest me a way, how i can parse this json string and convert its to Scala types

Upvotes: 4

Views: 19366

Answers (2)

Patel Sunil
Patel Sunil

Reputation: 461

you may access keys and values in any json as:

import scala.util.parsing.json.JSON
import scala.collection.immutable.Map

val jsonMap = JSON.parseFull(response).getOrElse(0).asInstanceOf[Map[String,String]]
val innerMap = jsonMap("result").asInstanceOf[Map[String,String]]
innerMap.keys //will give keys
innerMap("anykey") //will give value for any key anykey

Upvotes: 3

z33m
z33m

Reputation: 6043

The error that you get is caused because the compiler has no way of knowing the type of e in Some(e) pattern, its infered as Any. And Any doesnt have a foreach method. You can solve this by explicitly specifying the type of e as a Map.

Secondly, for a Map foreach has the signature foreach(f: ((A, B)) ⇒ Unit): Unit. The argument of the anonymous function is a tuple containing the key and value.

Try something like this:

println(request.getParameter("content"))//{"id":1,"name":"OZKA","birthDate":"1981-02-08T20:00:00.000Z","monthRevenue":1000.75,"developer":true}
val result = scala.util.parsing.json.JSON.parseFull(request.getParameter("content"))
result match {
  case Some(e:Map[String,String]) => {
    println(e); //output: Map(name -> OZKA, monthRevenue -> 1000.75, developer -> true, birthDate -> 1981-02-08T20:00:00.000Z, id -> 1.0)
    e.foreach { pair =>
        println(pair._1 + ":" + pair._2)        
    }
  }
  case None => println("Failed.")
}

Upvotes: 9

Related Questions