如何在akka-Http中返回JSON而不是Case类

libraryDependencies += "com.typesafe.akka" %% "akka-http" % "2.6.16"

import akka.http.scaladsl.server.Directives._
import akka.http.scaladsl.marshallers.sprayjson.SprayJsonSupport._
import spray.json.DefaultJsonProtocol._

// 定义一个Case类
case class User(id: Int, name: String)

// 定义JSON格式化
implicit val userFormat = jsonFormat2(User)

// 创建路由处理程序
val route = path("user") {
  get {
    // 返回JSON数据
    val user = User(1, "John")
    complete(user)
  }
}

import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.stream.ActorMaterializer

import scala.concurrent.ExecutionContextExecutor

object Main extends App {
  // 创建Actor系统和流材料化
  implicit val system: ActorSystem = ActorSystem("my-system")
  implicit val materializer: ActorMaterializer = ActorMaterializer()
  implicit val executionContext: ExecutionContextExecutor = system.dispatcher

  // 绑定路由处理程序到服务器
  val bindingFuture = Http().bindAndHandle(route, "localhost", 8080)

  // 输出服务器启动信息
  bindingFuture.map { binding =>
    println(s"Server is running at http://${binding.localAddress.getHostString}:${binding.localAddress.getPort}/")
  }.recover { case ex =>
    println(s"Server failed to start: ${ex.getMessage}")
  }
}