Question

好的，这真是让我烦恼。我已经使用spray和scala，akka实现了一个REST api。我已经成功实现了spall get，post路由来查询mysql数据库并给出了json输出。我能够在post体内发送参数，但是我无法发送与JSON相同的参数。它看起来很简单但它只是不工作。我收到错误 - 来自服务器的空回复。请帮忙。

这是我的示例curl命令：

curl -H "Content-Type: application/json" -X POST  -d '{ "name": "Jane", "favNumber" : 42 }' http://localhost:8080/jsonTesting

我正在尝试这个小样本代码，看看是否可以解组json参数并获得所需的输出。如果它工作，那么我在我的实际代码中实现相同的。

import spray.json.DefaultJsonProtocol
import spray.json._
import spray.httpx.SprayJsonSupport

 object MyJsonProtocol extends DefaultJsonProtocol with SprayJsonSupport {
  implicit val Format = jsonFormat2(Person)

  case class Person(name:String, favNumber:Int)

 //Spray main class
  import akka.actor.ActorSystem
  import spray.routing.SimpleRoutingApp
  import spray.json.DefaultJsonProtocol
  import spray.json._
  import spray.http.MediaTypes._
  import MyJsonProtocol._
  import spray.routing._

   object SprayTest extends App with SimpleRoutingApp {
    implicit val system = ActorSystem()
    def testRoute(route: Route): Route = {
     post {
      respondWithMediaType(`application/json`){
        route      
        }
      }
     }
   startServer(interface = "localhost", port = 8080) {  
   testRoute {
     path("departed") {
       parameter('count.as[Boolean]) {count =>
          complete(if (count == true) "even ball" else "odd ball")
       }
     }
   } ~
   path("jsonTesting") {
     post{
    entity(as[Person]) { person =>
    complete(s"Person: ${person.name} - favoritenumber:${person.favNumber}")
         }
        }
       }
 }
}

这是错误：

Uncaught error from thread [default-akka.actor.default-dispatcher-2] shutting down JVM since 'akka.jvm-exit-on-fatal-error' is enabled for ActorSystem[default]
java.lang.NoSuchMethodError: spray.json.JsonParser$.apply(Ljava/lang/String;)Lspray/json/JsValue;
at spray.httpx.SprayJsonSupport$$anonfun$sprayJsonUnmarshaller$1.applyOrElse(SprayJsonSupport.scala:36)
at spray.httpx.SprayJsonSupport$$anonfun$sprayJsonUnmarshaller$1.applyOrElse(SprayJsonSupport.scala:34)
at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:36)
at spray.httpx.unmarshalling.Unmarshaller$$anon$1$$anonfun$unmarshal$1.apply(Unmarshaller.scala:29)
at spray.httpx.unmarshalling.SimpleUnmarshaller.protect(SimpleUnmarshaller.scala:40)
at spray.httpx.unmarshalling.Unmarshaller$$anon$1.unmarshal(Unmarshaller.scala:29)
at spray.httpx.unmarshalling.SimpleUnmarshaller.apply(SimpleUnmarshaller.scala:29)
at spray.httpx.unmarshalling.SimpleUnmarshaller.apply(SimpleUnmarshaller.scala:23)
at spray.httpx.unmarshalling.UnmarshallerLifting$$anon$3.apply(UnmarshallerLifting.scala:35)

Sbt dependecies：

 libraryDependencies ++= Seq(
"com.typesafe.akka" %% "akka-actor" % "2.3.6",
"com.typesafe.akka" %% "akka-http-experimental" % "0.7",
"io.spray" %%  "spray-json" % "1.3.2",
"io.spray" %% "spray-routing" % sprayVersion,
"io.spray" %% "spray-client" % sprayVersion,
"io.spray" %% "spray-testkit" % sprayVersion % "test",
"mysql" % "mysql-connector-java" % "5.1.25",
"com.typesafe.slick" %% "slick" % "3.0.0",
"com.typesafe.scala-logging" %% "scala-logging-slf4j" % "2.1.2"
)

使用spray在POST主体中以JSON形式发送参数

0 个答案: