[ActionScript 3.0] AS3 ServerSocket示例（官方示例）

下面的示例创建一个套接字服务器。要使用该服务器，可将套接字绑定到本地端口，然后从其他应用程序连接到该端口。该服务器仅识别 UTF-8 字符串。

 package
 {
     import flash.display.Sprite;
     import flash.events.Event;
     import flash.events.MouseEvent;
     import flash.events.ProgressEvent;
     import flash.events.ServerSocketConnectEvent;
     import flash.net.ServerSocket;
     import flash.net.Socket;
     import flash.text.TextField;
     import flash.text.TextFieldType;
     import flash.utils.ByteArray;

     /**
      * @author Frost.Yen
      * @E-mail 871979853@qq.com
      * @create 2015-8-21 下午3:49:14
      *
      */
     public class ServerSocketExample extends Sprite
     {
         private var serverSocket:ServerSocket = new ServerSocket();
         private var clientSocket:Socket;

         private var localIP:TextField;
         private var localPort:TextField;
         private var logField:TextField;
         private var message:TextField;

         public function ServerSocketExample()
         {
             setupUI();

         }
         private function onConnect( event:ServerSocketConnectEvent ):void
         {
             clientSocket = event.socket;
             clientSocket.addEventListener( ProgressEvent.SOCKET_DATA, onClientSocketData );
             log( "Connection from " + clientSocket.remoteAddress + ":" + clientSocket.remotePort );
         }

         private function onClientSocketData( event:ProgressEvent ):void
         {
             var buffer:ByteArray = new ByteArray();
             clientSocket.readBytes( buffer, 0, clientSocket.bytesAvailable );
             log( "Received: " + buffer.toString() );
         }

         private function bind( event:Event ):void
         {
             if( serverSocket.bound )
             {
                 serverSocket.close();
                 serverSocket = new ServerSocket();

             }
             serverSocket.bind( parseInt( localPort.text ), localIP.text );
             serverSocket.addEventListener( ServerSocketConnectEvent.CONNECT, onConnect );
             serverSocket.listen();
             log( "Bound to: " + serverSocket.localAddress + ":" + serverSocket.localPort );
         }

         private function send( event:Event ):void
         {
             try
             {
                 if( clientSocket != null && clientSocket.connected )
                 {
                     clientSocket.writeUTFBytes( message.text );
                     clientSocket.flush();
                     log( "Sent message to " + clientSocket.remoteAddress + ":" + clientSocket.remotePort );
                 }
                 else log("No socket connection.");
             }
             catch ( error:Error )
             {
                 log( error.message );
             }
         }

         private function log( text:String ):void
         {
             logField.appendText( text + "\n" );
             logField.scrollV = logField.maxScrollV;
             trace( text );
         }

         private function setupUI():void
         {
             localIP = createTextField( 10, 10, "Local IP", "0.0.0.0");
             localPort = createTextField( 10, 35, "Local port", "0" );
             createTextButton( 170, 60, "Bind", bind );
             message = createTextField( 10, 85, "Message", "Lucy can't drink milk." );
             createTextButton( 170, 110, "Send", send );
             logField = createTextField( 10, 135, "Log", "", false, 200 )

             this.stage.nativeWindow.activate();
         }

         private function createTextField( x:int, y:int, label:String, defaultValue:String = '', editable:Boolean = true, height:int = 20 ):TextField
         {
             var labelField:TextField = new TextField();
             labelField.text = label;
             labelField.type = TextFieldType.DYNAMIC;
             labelField.width = 100;
             labelField.x = x;
             labelField.y = y;

             var input:TextField = new TextField();
             input.text = defaultValue;
             input.type = TextFieldType.INPUT;
             input.border = editable;
             input.selectable = editable;
             input.width = 280;
             input.height = height;
             input.x = x + labelField.width;
             input.y = y;

             this.addChild( labelField );
             this.addChild( input );

             return input;
         }

         private function createTextButton( x:int, y:int, label:String, clickHandler:Function ):TextField
         {
             var button:TextField = new TextField();
             button.htmlText = "<u><b>" + label + "</b></u>";
             button.type = TextFieldType.DYNAMIC;
             button.selectable = false;
             button.width = 180;
             button.x = x;
             button.y = y;
             button.addEventListener( MouseEvent.CLICK, clickHandler );

             this.addChild( button );
             return button;
         }
     }
 }