用json使用spray发送帖子？

Question

很抱歉，我不能做到这一点:我需要添加一些json到一个帖子，所以遵循文档：http://spray.io/documentation/1.1-M8/spray-httpx/request-building/：

import scala.util.{Success, Failure}
import akka.actor.{Props, ActorSystem}
import spray.can.client.DefaultHttpClient
import spray.client.HttpConduit
import spray.httpx.SprayJsonSupport
import spray.http._
import spray.json.JsonParser._
import spray.json._
import HttpMethods._
import HttpHeaders._
import MediaTypes._
import spray.httpx.RequestBuilding._
import scala.concurrent.ExecutionContext.Implicits.global

..。

val req = HttpRequest(method = POST, uri = "/api/1.0/users/ping.json", entity = HttpEntity(`application/json`,"""{ "key"="whatever" }"""))

而且它永远不会编译：

overloaded method value apply with alternatives:
[error]   (optionalBody: Option[spray.http.HttpBody])spray.http.HttpEntity <and>
[error]   (buffer: Array[Byte])spray.http.HttpEntity <and>
[error]   (string: String)spray.http.HttpEntity
[error]  cannot be applied to (spray.http.MediaType, String)
[error]     val req = HttpRequest(method = POST, uri = "/api/1.0/users/ping.json", entity = HttpEntity(`application/json`,"""{ "key"="whatever"}"""))

Answer 1

也有同样的问题，并在这里找到了解决方案：

https://github.com/spray/spray-json/blob/master/src/main/scala/spray/json/AdditionalFormats.scala#L30-41

这对我来说终于起作用了：

import spray.httpx.SprayJsonSupport
import spray.json.AdditionalFormats

object Client extends SprayJsonSupport with AdditionalFormats {
    val email = "..."
    val password = "..."
    val pipeline = sendReceive       
    pipeline(Post("http://something.com/login", s"""{
        "email": "$email",
        "password": "$password"
    }""".asJson.asJsObject))
}

Answer 2

对不起，你的问题有点麻烦，至少对我来说是这样。如果你想在Spray中使用一些Json作为HttpEntity来发出POST请求，那么你应该尝试使用Spray Client流水线来实现，这非常简单。

您需要创建一个简单的管道：

val pipe: HttpRequest => Future[HttpResponse] = sendReceive

然后构建一个请求：

import spray.json.SprayJsonSupport._
pipe(Post("/api/1.0/users/ping", """{ "key"="whatever" }""".asJson))

这将返回一个带有HttpResponse的Future，如果你想要一些特定的结果，比如说，一些确认码，那么在你的管道中添加unmarshall步骤：

val pipe: HttpRequest => Future[ConfCode] = sendReceive ~> unmarshal[ConfCode]

Answer 3

这也是我尝试过的，但它不起作用它告诉我我缺少一个隐含的：

val pipeline = sendReceive(conduit)
val responseF = pipeline(Post("/api/1.0/users/ping.json", """{ "key": "whatever" }""".asJson))

responseF onComplete { ...

但我总是得到：

could not find implicit value for evidence parameter of type spray.httpx.marshalling.Marshaller[spray.json.JsValue]
[error]     val responseF = pipeline(Post("/api/1.0/users/ping.json", """{ "key": "whatever" }""".asJson))

此外，您在上一个快照中的导入也不起作用...我使用的是不好的库版本吗？我的sbt设置为：

val sprayVersion = "1.1-M7"
val akkaVersion = "2.1.1"
"io.spray" %% "spray-json"   % "1.2.5",
    "com.typesafe.akka" %% "akka-actor" % akkaVersion,
    "com.typesafe.akka" %% "akka-slf4j" % akkaVersion,
    "io.spray" %  "spray-client" % sprayVersion,