Scala 在JSON中修改键

假设我有一个JSON对象，如下所示：

{ 
  "CATEGORY": "reference",
  "AUTHOR": "Nigel Rees",
  "TITLE": "Sayings of the Century",
  "PRICE": 8.95
}

这在系统中作为

JsObject

流动。使用Spray，如何将这些字段小写？

此代码：

import spray.json._

val str =
    """{"CATEGORY": "reference",
        "AUTHOR":  "Nigel Rees",
        "TITLE": "Sayings of the Century",
        "PRICE": 8.95}"""

  def main(args: Array[String]) : Unit =
    println(JsObject(str.parseJson.asJsObject.fields.map(el => el._1.asInstanceOf[String].toLowerCase -> el._2 )))

给出：

{"author":"Nigel Rees","category":"reference","price":8.95,"title":"Sayings of the Century"}

在sbt中具有以下依赖性：

"com.typesafe.akka" %% "akka-http-spray-json" % "10.1.8"

此代码：

import spray.json._

val str =
    """{"CATEGORY": "reference",
        "AUTHOR":  "Nigel Rees",
        "TITLE": "Sayings of the Century",
        "PRICE": 8.95}"""

  def main(args: Array[String]) : Unit =
    println(JsObject(str.parseJson.asJsObject.fields.map(el => el._1.asInstanceOf[String].toLowerCase -> el._2 )))

给出：

{"author":"Nigel Rees","category":"reference","price":8.95,"title":"Sayings of the Century"}

在sbt中具有以下依赖性：

"com.typesafe.akka" %% "akka-http-spray-json" % "10.1.8"