as3与node.js的socket通信

这里使用了一个单例的SocketManager类：

conn = new Socket();

conn.addEventListener(Event.CLOSE, onSocketCloseHandler);
conn.addEventListener(Event.CONNECT, onSocketConnectHandler);
conn.addEventListener(IOErrorEvent.IO_ERROR, onSocketIOErrorHandler);
conn.addEventListener(SecurityErrorEvent.SECURITY_ERROR, onSocketSecurityHandler);
conn.addEventListener(ProgressEvent.SOCKET_DATA, onSocketDataHandler);

SocketManager最多在连接失败时，进行5次重连。建立socket连接代码：

public function connSocket(url:String, port:Number, _endian:String=""):void
{
    if (conn == null)
    {
        initSocket();
    }

    if (_endian == '')
    {
        _endian = Endian.BIG_ENDIAN;
    }

    CURR_RECONN_NUM = 0;

    conn.endian = _endian;

    socket_url = url;
    socket_port = port;

    conn.connect(socket_url, socket_port);
}

如果需要发送socket数据，直接调用send方法：

/**
 * 发送数据
 */
private function send(bytes:IMeteoricByteArray):Boolean
{
    if (checkConnIsSuc() == false)
    {
        return false;
    }

    var bytes_len:uint = bytes.size();

    var byteArr:ByteArray = new ByteArray();

    byteArr.writeInt(bytes_len + headLen);
    byteArr.writeBytes(bytes.getByte());

    conn.writeBytes(byteArr);
    conn.flush();

    bytes.dispose();

    return true;
}

格式：数据包头部长度(int-带符号的32位整数)|消息标识(short-16位整数)|消息返回标识(short-16位整数)|…

bytes.writeInt();

bytes.writeShort();

bytes.writeShort();

bytes…

根据不同的消息标识（唯一），后台获取标识后调用不同的解析方法，解析客户端发送的数据

前台as3建立socket，发送数据、解析数据，网上很多例子，这里不重点说了。这里重点介绍node.js如何解析消息（不使用任何第三方库）：

var net  = require('net');
var clients = [];

var HOST = '127.0.0.1';
var PORT = 7000;

net.createServer(function(socket) {

    console.log('Connected: ' + socket.remoteAddress +':'+ socket.remotePort);

    clients.push(socket);

    socket.on('data', function(data) {
        console.log('receive data：' + socket.remoteAddress +':'+ socket.remotePort);

        var isBuffer = Buffer.isBuffer(data);

        if (isBuffer) {
            var offset = data['readInt32BE'](0);
            var headCode = data['readInt16BE'](offset);
            offset += 2;
            var headBackCode = data['readInt16BE'](offset);
            offset += 2;


            var len = data['readInt16BE'](offset);
            offset += 2;

            var msg = data.toString('utf8', offset, offset + len)

            console.log(headCode + '-' + headBackCode + '-' + msg);

            broadcast(msg, socket);
        } else {
            console.log('Message is not Buffer!');
        }

    });

    socket.on('end', function() {
        console.log('Close Connected: ' + socket);
        clients.splice(clients.indexOf(socket));
    });

    function broadcast(message, sender) {
        clients.forEach(function(client) {
            //if (client === sender) {
                client.write(message);
            // }
        });
    }

}).listen(PORT, HOST);


console.log('服务已启动');

如果一切正常，前台发送数据时，控制台上能看到解析的数据：

1000是头标识，10为消息返回标识，abcdefg为发送的字符串。

var data:MeteoricSocketSendDataProxy = SocketManager.getInstance().getSocketSendDataProxy(1000, 10) as MeteoricSocketSendDataProxy;
data.addStringData(msg);

SocketManager.getInstance().sendDataProxy(data);

上面的解析过程可能比较繁琐，你可以使用Node.js的ByteBuffer (nodejs的ByteBuffer，和C++通信的利器！)

作者：play175

https://npmjs.org/package/ByteBuffer

使用方法也比较简单：

//使用ByteBuffer进行解包操作
var buf = new ByteBuffer(data);
var arr = buf.int32()                    
        .short()
        .short()
        .string()            
        .unpack();

console.log(arr);

broadcast(arr[3], socket);


/*************************************************/
//原方法
var offset = data['readInt32BE'](0);
var headCode = data['readInt16BE'](offset);
offset += 2;
var headBackCode = data['readInt16BE'](offset);
offset += 2;         


var len = data['readInt16BE'](offset);
offset += 2;

var msg = data.toString('utf8', offset, offset + len)

console.log(headCode + '-' + headBackCode + '-' + msg);

broadcast(msg, socket);

有兴趣的可以下载全部源码(Flex-SDK4.5 + node.js)，点此立即下载>>

参考资料：

AS3 Socket类

Node.js ByteBuffer

Node.js Buffer

http://nodejs.org/api/buffer.html

JavaScript解析二进制数据>>