是否可以在不安装Play的情况下使用JSON库？

Question

在我的build.sbt:

lazy val commonSettings = Seq(
  version := "1.0.0",
  scalaVersion := "2.11.6"
)
lazy val root = (project in file(".")).
  settings(commonSettings: _*).
  settings(
    name := "myapp",
    libraryDependencies ++= Seq(
      "com.typesafe.play" % "play-json_2.11" % "2.3.4",
      "org.scalatest" % "scalatest_2.11" % "2.2.4" % "test",
      "junit" % "junit" % "4.12" % "test"
    )
  )
resolvers ++= Seq("Typesafe Repo" at "http://repo.typesafe.com/typesafe/releases/")

它汇编得很好.现在我使用的代码,import play.api.libs.json._但编译器给出错误说"找不到:对象播放".显然我没有安装游戏.是否可以在play-json不安装Play的情况下使用库？

Answer 1

考虑这个简单的sbt项目:

build.sbt

libraryDependencies ++= Seq(
  "com.typesafe.play" %% "play-json" % "2.3.4"
)

resolvers ++= Seq("Typesafe Repo" at "http://repo.typesafe.com/typesafe/releases/")

然后你可以运行:

sbt console
import play.api.libs.json._
Json.parse("{}")
> res0: play.api.libs.json.JsValue = {}

是的,你可以玩没有Play的play-json.如果它在您的项目中不起作用,请尝试重新启动SBT或在SBT中执行清理,重新加载,更新和编译.