要给出“Akka Http / Circe 解码结果”的解决方法,您需要使用Akka Http和Circe库来处理HTTP请求和JSON解码。以下是一个示例代码,演示如何使用Akka Http和Circe将HTTP请求的JSON响应解码为对象:
首先,您需要添加Akka Http和Circe依赖项到您的项目中。在build.sbt文件中添加以下行:
libraryDependencies ++= Seq(
"com.typesafe.akka" %% "akka-http" % "2.6.15",
"io.circe" %% "circe-generic" % "0.14.1",
"io.circe" %% "circe-parser" % "0.14.1"
)
接下来,您需要创建一个用于发送HTTP请求的Akka Http客户端。以下是一个简单的示例:
import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.model._
import akka.http.scaladsl.unmarshalling.Unmarshal
import akka.stream.ActorMaterializer
import scala.concurrent.Future
implicit val system = ActorSystem()
implicit val materializer = ActorMaterializer()
val httpClient = Http().outgoingConnection("api.example.com")
def sendRequest(request: HttpRequest): Future[HttpResponse] = {
Source.single(request).via(httpClient).runWith(Sink.head)
}
然后,您需要定义一个用于解码JSON的Circe解码器。以下是一个示例:
import io.circe._
import io.circe.generic.auto._
case class User(id: Int, name: String)
implicit val userDecoder: Decoder[User] = Decoder.forProduct2("id", "name")(User.apply)
最后,您可以使用Akka Http发送HTTP请求,并使用Circe解码器解码响应。以下是一个示例:
val request = HttpRequest(uri = "https://api.example.com/users/1")
val responseFuture: Future[HttpResponse] = sendRequest(request)
val userFuture: Future[Either[Error, User]] = responseFuture.flatMap { response =>
response.status match {
case StatusCodes.OK =>
Unmarshal(response.entity).to[User].map(Right.apply)
case _ =>
Unmarshal(response.entity).to[String].flatMap { entity =>
val error = Error(response.status.intValue(), entity)
Future.successful(Left(error))
}
}
}
userFuture.foreach {
case Right(user) =>
println(s"User: $user")
case Left(error) =>
println(s"Error: $error")
}
以上代码示例了如何使用Akka Http发送一个HTTP请求,并使用Circe解码器解码响应的JSON。根据实际情况,您可能需要根据您的API和数据模型进行一些自定义。