要在Akka HTTP中实现WebSocket的双向通信,可以按照以下步骤进行:
libraryDependencies += "com.typesafe.akka" %% "akka-http" % "version"
libraryDependencies += "com.typesafe.akka" %% "akka-stream" % "version"
请确保将“version”替换为您希望使用的具体版本。
import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.model.ws.{Message, TextMessage}
import akka.http.scaladsl.server.Directives._
import akka.stream.{ActorMaterializer, OverflowStrategy}
import akka.stream.scaladsl.{Flow, Sink, Source}
object WebSocketServer {
def main(args: Array[String]): Unit = {
implicit val actorSystem = ActorSystem()
implicit val materializer = ActorMaterializer()
implicit val executionContext = actorSystem.dispatcher
val echoService: Flow[Message, Message, Any] =
Flow[Message].map {
case TextMessage.Strict(text) =>
TextMessage(s"Echo: $text")
}
val route =
path("websocket") {
handleWebSocketMessages(echoService)
}
val bindingFuture = Http().bindAndHandle(route, "localhost", 8080)
println(s"Server online at http://localhost:8080/\nPress RETURN to stop...")
scala.io.StdIn.readLine()
bindingFuture.flatMap(_.unbind()).onComplete(_ => actorSystem.terminate())
}
}
在上面的示例中,我们创建了一个简单的WebSocket路由器,它将接收来自客户端的文本消息并将其返回作为回显。
sbt run
这将启动WebSocket服务器并将其绑定到本地主机上的8080端口。
const socket = new WebSocket("ws://localhost:8080/websocket");
socket.onopen = function(event) {
console.log("WebSocket connected");
socket.send("Hello server");
};
socket.onmessage = function(event) {
console.log("Received message from server: " + event.data);
};
socket.onclose = function(event) {
console.log("WebSocket disconnected");
};
在上面的示例中,我们使用WebSocket API连接到服务器,并在连接打开时发送一条消息。然后,我们在接收到服务器发送的消息时将其打印到控制台。最后,当连接关闭时,我们也会打印出相应的消息。
这样,您就可以使用Akka HTTP和WebSocket实现双向通信的场景了。