如何使用Play Framework在Scala中使用WebSockets？

如何解决如何使用Play Framework在Scala中使用WebSockets？

| 我想在Scala和Play框架中使用WebSockets。但是我无法使Echo服务器示例正常工作。 import0ѭ和

disconnect()

应导入什么？ 我得到的错误是

Error raised is : not found: value await

。我使用下面的代码：

package controllers
import play._
import play.mvc._
import play.mvc.Http.WebSocketEvent
import play.mvc.Http.WebSocketFrame
import play.mvc.Http.WebSocketClose
import play.mvc.WebSocketController

object MySocket extends WebSocketController {
    def echo = {
        while(Http.Inbound.current().isopen()) {

            val e : WebSocketEvent = 
        await(Http.Inbound.current().nextEvent()).asInstanceOf[WebSocketEvent]

            if(e.isinstanceOf[WebSocketFrame]) {
                val frame : WebSocketFrame = e.asInstanceOf[WebSocketFrame]

                if(!frame.isBinary) {
                    if(frame.textData.equals(\"quit\")) {
                        Http.Outbound.current().send(\"Bye!\");
                        disconnect();
                    } else {
                        Http.Outbound.current().send(\"Echo: \" + frame.textData)
                    }
                }
            }
            if(e.isinstanceOf[WebSocketClose]) {
                Logger.info(\"Socket closed!\")
            }
        }
    }
}

这是终端中的编译错误：

Compiling:
    /Users/jonas/play-1.2.2RC1/jonassite/app/MySocket.scala
/Users/jonas/play-1.2.2RC1/jonassite/app/MySocket.scala:14: not found: value await
            val e : WebSocketEvent = await(Http.Inbound.current().nextEvent()).asInstanceOf[WebSocketEvent]
                                     ^
/Users/jonas/play-1.2.2RC1/jonassite/app/MySocket.scala:20: not found: value disconnect
                        disconnect();
                        ^
two errors found
Compiling:
    /Users/jonas/play-1.2.2RC1/jonassite/app/MySocket.scala
/Users/jonas/play-1.2.2RC1/jonassite/app/MySocket.scala:14: not found: value await
            val e : WebSocketEvent = await(Http.Inbound.current().nextEvent()).asInstanceOf[WebSocketEvent]
                                     ^
/Users/jonas/play-1.2.2RC1/jonassite/app/MySocket.scala:20: not found: value disconnect
                        disconnect();
                        ^
two errors found
12:52:57,049 ERROR ~ 

@66lce6kp8
Internal Server Error (500) for request GET /handshake

Compilation error (In /app/MySocket.scala around line 14)
The file /app/MySocket.scala Could not be compiled. Error raised is : not found: value await

play.exceptions.CompilationException: not found: value await
    at play.scalasupport.ScalaPlugin.compilationException(ScalaPlugin.scala:129)
    at play.scalasupport.ScalaPlugin.detectClassesChange(ScalaPlugin.scala:115)
    at play.plugins.PluginCollection.detectClassesChange(PluginCollection.java:358)
    at play.Play.detectChanges(Play.java:591)
    at play.Invoker$Invocation.init(Invoker.java:186)
    at Invocation.HTTP Request(Play!)

    

解决方法

        

await()

和

disconnect()

是

WebSocketController

中可用的方法。但是，这些当前仅在Java版本中可用，而在Scala中不可用。有关更多信息，请参见此处的播放组。 它应该在scala插件的1.0版本中可用，但是现在如果您要使用aysnc功能（等待等），则必须使用Java，或者看看其中一个Play的Java包装器。用户得到发展。