akka http -如何将json数据添加到post请求？

libraryDependencies += "com.typesafe.akka" %% "akka-http-spray-json" % "x.x.x"

import spray.json.DefaultJsonProtocol

case class User(id: Int, name: String)

object UserJsonProtocol extends DefaultJsonProtocol {
  implicit val userFormat = jsonFormat2(User)
}

import akka.http.scaladsl.server.Directives._
import akka.http.scaladsl.marshallers.sprayjson.SprayJsonSupport._

val route = path("users") {
  post {
    entity(as[User]) { user =>
      // 处理接收到的User对象
      complete(s"Received user: ${user.name}")
    }
  }
}

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

object Main extends App {
  implicit val system = ActorSystem()
  implicit val materializer = ActorMaterializer()
  implicit val executionContext = system.dispatcher

  val bindingFuture = Http().bindAndHandle(route, "localhost", 8080)

  println(s"Server online at http://localhost:8080/")
}