检查play.api.libs.json.Json中是否存在密钥

Question

contains 喜欢的功能 play.api.libs.json.Json

val data=Map("id" -> "240190", "password" -> "password","email" -> "email@domain.com")

data.contains("email")//true


val info=Json.obj("id" -> "240190", "password" -> "password","email" -> "email@domain.com")

现在如何检查是否info包含email？

Answer 1

info.keys.contains("email")

该.keys给你回Set与键值,然后你可以调用contains方法,我不知道还有一个更直接的方式来做到这一点.

Answer 2

(info \ "email").asOpt[String].isEmpty

因为asOpt会返回Optional,我们可以进行isEmpty简单检查,这样可以做我们想要的.

Answer 3

(info \ "email").asOpt[String] match {
  case Some(data) => println("here is the value for the key email represented by variable data" + data)
  case None => println("email key is not found") 
}