如何在 Scala 中将 Map 转换为 Json

Question

我的地图如下：

Map(
Columbus Herzog -> 
 Map(
 0 -> Map(source -> Las Cruces Crawford Arpt (LRU), amount -> 5000.0, points -> 500, date_time -> Sat Feb 13 02:18:14 IST 2016, class -> First, destination -> San Luis Arpt (IPI)), 
 1 -> Map(source -> Las Cruces Crawford Arpt (LRU), amount -> 5000.0, points -> 500, date_time -> Fri Jul 22 01:52:19 IST 2016, class -> First, destination -> San Luis Arpt (IPI)), 
 2 -> Map(source -> Las Cruces Crawford Arpt (LRU), amount -> 5000.0, points -> 500, date_time -> Wed Jan 06 06:24:50 IST 2016, class -> First, destination -> San Luis Arpt (IPI)), 
 3 -> Map(source -> Las Cruces Crawford Arpt (LRU), amount -> 5000.0, points -> 500, date_time -> Tue May 17 17:12:16 IST 2016, class -> First, destination -> San Luis Arpt (IPI))
 )
)

我想要如下 JSON 数组：

{"Columbus Herzog":
[{"source":"Las Cruces Crawford Arpt (LRU)","amount":"5000.0","points":"500","date_time":"Sat Feb 13 02:18:14 IST 2016","class":"First","destination":"San Luis Arpt (IPI)"}],
[{"source":"Las Cruces Crawford Arpt (LRU)","amount":"5000.0","points":"500","date_time":"Fri Jul 22 01:52:19 IST 2016","class":"First","destination":"San Luis Arpt (IPI)"}],
[{"source":"Las Cruces Crawford Arpt (LRU)","amount":"5000.0","points":"500","date_time":"Wed Jan 06 06:24:50 IST 2016","class":"First","destination":"San Luis Arpt (IPI)"}],
[{"source":"Las Cruces Crawford Arpt (LRU)","amount":"5000.0","points":"500","date_time":"Tue May 17 17:12:16 IST 2016","class":"First","destination":"San Luis Arpt (IPI)"}]
}

请指教。

提前谢谢你。

Answer 1

net.liftweb.json.DefaultFormats呢

import net.liftweb.json.JsonAST
import net.liftweb.json.JsonDSL._
import net.liftweb.json.Printer.{compact,pretty}

object LiftJsonWithCollections extends App {

    val json = List(1, 2, 3)
    println(compact(JsonAST.render(json)))

    val map = Map("1" -> "one", "2" -> "two")
    println(compact(JsonAST.render(map)))
}

和输出：

[1,2,3]
{"1":"one","2":"two"}

只需将Map的内容替换为拥有。