Scala 如何在spray中使用spray json执行简单的json post？

我正在尝试使用spray执行一个简单的json post。但我似乎可以为json对象获取一个http实体，该实体可以是Marshall

这是我的错误：

[错误] ..…/IdeaProjects/PoolpartyConnector/src/main/scala/org/iadb/PoolpartyConnector/thesaurusoperation/ThesaurusCacheService.scala:172： 找不到类型为的证据参数的隐式值 spray.httpx.marshalling.Marshaller[spray.json.JsValue]

[错误]val请求= 发布“$thesaurusapiEndpoint/$CoreProjected/suggestFreeConcept？”， suggestionJsonBody）

以及随附的代码：

 override def createSuggestedFreeConcept(suggestedPrefLabel: String, lang: String, scheme: String, b: Boolean): String = {

    import system.dispatcher
    import spray.json._

    val pipeline      = addCredentials(BasicHttpCredentials("superadmin", "poolparty")) ~> sendReceive


    val label              = LanguageLiteral(suggestedPrefLabel, lang)
    val suggestion         = SuggestFreeConcept(List(label), b, Some(List(scheme)), None, None,None, None)
    val suggestionJsonBody = suggestion.toJson

    val request            = Post(s"$thesaurusapiEndpoint/$coreProjectId/suggestFreeConcept?", suggestionJsonBody)

    val res                = pipeline(request)

    getSuggestedFromFutureHttpResponse(res) match {

      case None => ""
      case Some(e) => e

    }
  }

---

拜托，有人知道马歇尔是怎么回事吗。我认为spray Json将随隐式封送器一起提供。

我假设您已经在某个地方有了自定义Json协议，以便

suggestion.toJson

能够正常工作

请尝试以下操作：

val body = HttpEntity(`application/json`, suggestionJsonBody.prettyPrint)
val request = Post(s"$thesaurusapiEndpoint/$coreProjectId/suggestFreeConcept?", body)

---

您也可以使用

compactPrint

而不是

prettyPrint

，在这两种情况下，它都会将Json转换为包含Json信息的字符串。

以下是我如何解决它的：

override def createSuggestedFreeConcepts(suggestedPrefLabels: List[LanguageLiteral], scheme: String, checkDuplicates: Boolean): List[String] = {


    import system.dispatcher

    import spray.httpx.marshalling._
    import spray.httpx.SprayJsonSupport._

    val pipeline      = addCredentials(BasicHttpCredentials("superadmin", "poolparty")) ~> sendReceive


    suggestedPrefLabels map { suggestedPrefLabel =>

      val suggestion    = SuggestFreeConcept(List(suggestedPrefLabel), checkDuplicates, Some(List(Uri(scheme))), None, None, None, None)
      val request       = Post(s"$thesaurusapiEndpoint/$coreProjectId/suggestFreeConcept", marshal(suggestion))

      val res           = pipeline(request)

      getSuggestedFromFutureHttpResponse(res) match {

        case None => ""
        case Some(e) => e

      }

    }

  }

关键是：

导入spray.httpx.marshalling.\uu导入spray.httpx.SprayJsonSupport_

及

val请求= 发布“$thesaurusapiEndpoint/$CoreProjected/suggestFreeConcept”， 元帅（建议））

我同意你的建议。这一解释并不十分直截了当。但是，通过在文档中访问，可以解释这一点