[英]How to serialize Scala Map to Json in PlayFramework?
Looks like Play Json Library is unable to serialize Scala Collections. 看起来Play Json Library无法序列化Scala集合。 Is there any alternative.
有没有其他选择。 I just need to dump the data from a map.
我只需要从地图转储数据。
import scala.concurrent._
import play.api.libs.ws._
import scala.concurrent.ExecutionContext.Implicits.global
import play.libs.Json
object temp {
// Correct Serialization
val javaMap = new java.util.HashMap[String, String]()
javaMap.put("Abc", "Def")
// Outputs: res1: String = {"Abc":"Def"}
Json.stringify(Json.toJson(javaMap))
// Incorrect Serialization
val scalaMap = Map("Abc" -> "Def") //> scalaMap : scala.collection.immutable.Map[String,String] = Map(Abc -> Def)
// Output: res2: String = {"empty":false,"traversableAgain":true}
Json.stringify(Json.toJson(scalaMap)) //> res2: String = {"empty":false,"traversableAgain":true}
}
您正在导入错误的JSON库。
import play.api.libs.json._
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