Tested Env: Scala 2.11, lift-json_2.11-2.6.3
1. Normal Scala Map
| val m = Map( | |
| "name" -> "john doe", | |
| "age" -> 18, | |
| "hasChild" -> true, | |
| "childs" -> List("a", "b", "c") | |
| ) |
m ‘s type: Map[String, Any]
2. Use lift-json’s implicit
| import net.liftweb.json.JsonAST._ | |
| import net.liftweb.json.JsonDSL._ | |
| import net.liftweb.json.Printer._ | |
| val m2: Map[String, JValue] = Map( | |
| "name" -> "john doe", | |
| "age" -> 18, | |
| "hasChild" -> true, | |
| "childs" -> List("a", "b", "c") | |
| ) |
Cast Map[String, Any] to Map[String, JValue] explicitly.
3. Convert Map[String, JValue] to JObject
| val json = JObject(m2.toList.map(x => JField(x._1, x._2))) |
4. Generate String from JObject
| // Compact | |
| compact(render(json)) | |
| // Pretty | |
| pretty(render(json)) |
5. But!
It cannot convert List that contains Map (List[Map]), since lift-json doesn’t have implicit function for converting Map to JValue. I have tried several implicit functions, but all of them failed.
So you need to traverse through List to convert Map to JValue (pre-processing), or explicitly convert values by calling implicit function directly with match expression.