flash代码：

package  
{
    import flash.display.*;
    import flash.events.*;
    import flash.net.*;
    import flash.system.*;
    import flash.text.*;
    import flash.utils.*;
    /*
     * 
     */
    public class Client extends Sprite {
        
        public function Client():void {
            var socket:Socket = new Socket();
            socket.addEventListener(Event.CONNECT,onEvent);//侦听连接事件
            socket.addEventListener(Event.CLOSE,onEvent);//侦听关闭事件
            socket.addEventListener(ProgressEvent.SOCKET_DATA,onEvent);//侦听数据收到事件
            socket.connect('127.0.0.1',3944);//连接服务端
        }
        public function onEvent(e:Event):void   {
            var socket:Socket = e.target as Socket;
            switch(e.type){
                case Event.CONNECT:
                    trace('已连接成功');
                    socket.writeUTFBytes('我是来自客户端的消息');//把字符串按照utf-8的编码发出去
                    break;
                case Event.CLOSE:
                    trace('服务器关闭！');
                    socket.close();
                    break;
                case ProgressEvent.SOCKET_DATA:
                    trace('收到数据,长度'+socket.bytesAvailable);
                    read(socket);
                    break;
            }
        }
        public function read(socket:Socket):void    {
            var ba:ByteArray = new ByteArray();//缓冲区
            socket.readBytes(ba,0,socket.bytesAvailable);//按收到的数据长度来读
            var val:String = ba.readUTFBytes(ba.length);//安装utf-8的编码解析二进制
            trace(val);
        }
    }

}

服务端代码：

var XML =
'<?xml version="1.0"?>' +
'<!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd">' +
'<cross-domain-policy>' +
'<allow-access-from domain="*" to-ports="*" />' +
'</cross-domain-policy>'

var net = require('net'),
    http = require("http"),
    fs = require("fs"),
    path = require("path"),
    url = require("url");
    
var index = 0;
var server = net.createServer(
    function(socket){
        index++;
        new Client(index,socket);
});
server.listen(3944, '127.0.0.1');

console.log('服务端已开启...');

function Client(index,socket) {
    var myIndex = index;
    socket.setTimeout(1500, function() {
        console.log(socket.remoteAddress + ' 超时');
        socket.destroy();
    });
    
    socket.on('data', function(data) {
        if(data.toString()=='<policy-file-request/>\0'){
            socket.write('你好,第'+myIndex+'号客户端。我是服务端','utf-8');
            socket.write(XML);
            console.log('相等');
            console.log(data.toString());
            socket.end();
        }       
    });    
}