Java、C#端进行Socket异步数据传输

小白最近在做一个项目，涉及到Android端和Window端进行数据传输，实现通信过程中即时传输，即时回复的功能，所以用到了Socket异步通信。Socket通信的基础是通信的双方都在同一个局域网内，为此小白让电脑端开WIFI，然后Android端连接创建通信环境。

1、C#端
1.1MyFriend.cs
设置缓存byte数组，接收java传输的数据。

 class MyFriend    {        //用于保存与每个客户相关信息：套接字与接收缓存        public Socket socket;        public byte[] Rcvbuffer;        //实例化方法        public MyFriend(Socket s)        {            socket = s;        }        //清空接受缓存，在每一次新的接收之前都要调用该方法        public void ClearBuffer()        {            Rcvbuffer = new byte[1024];        }        //        public void Dispose()        {            try            {                socket.Shutdown(SocketShutdown.Both);                socket.Close();            }            finally            {                socket = null;                Rcvbuffer = null;            }        }    }

1.2 主程序

        bool IsStart = false;//检测socket线程是否开启        TcpListener listener; //建立线程监听        int Port = 10803;        MyFriend friend = null;        string data;  //接收到的数据

基础操作，把一些该定义的定义了，

  public int GetAvailablePort()        {            Random r = new Random();            int port = r.Next(1024, 65535);            while (PortInUse(port) == true)            {                port = r.Next(1024, 65535);            }            return port;        }        //判断端口是否被用          public static bool PortInUse(int port)        {            bool inUse = false;            IPGlobalProperties ipProperties = IPGlobalProperties.GetIPGlobalProperties();            IPEndPoint[] ipEndPoints = ipProperties.GetActiveTcpListeners();            foreach (IPEndPoint endPoint in ipEndPoints)            {                if (endPoint.Port == port)                {                    inUse = true;                    break;                }            }            return inUse;        }

这里把通信IP，Port搞定。

 private void start_listen_Click(object sender, EventArgs e)        {            //获取本机IPv4地址            IPAddress ip = IPAddress.Parse(GetLocalAddresses());            //设置默认端口号            int Port = GetAvailablePort();            //服务器已在其中监听，则返回            if (IsStart)                return;            //服务器启动侦听            IPEndPoint localep = new IPEndPoint(ip, Port);            listener = new TcpListener(localep);            listener.Start();            IsStart = true;            listBox_ShowMessage.Invoke(AppendString, string.Format("服务器已经启动监听！端点为：{0}。", listener.LocalEndpoint.ToString()));            listBox_ShowMessage.Invoke(AppendString, DateTime.Now.ToString());            listBox_ShowMessage.Invoke(AppendString, "---------------------------------------");            //接受连接请求的异步调用            AsyncCallback callback = new AsyncCallback(AcceptCallBack);            listener.BeginAcceptSocket(callback, listener);        }

listBox_ShowMessage 是windows窗体程序listbox空间，显示相关的信息。

private void AcceptCallBack(IAsyncResult ar)        {            try            {                //完成异步接收连接请求的异步调用                //将连接信息添加到列表和下拉列表中                Socket handle = listener.EndAcceptSocket(ar);                MyFriend frd = new MyFriend(handle);                AsyncCallback callback;                //继续调用异步方法接收连接请求                if (IsStart)                {                    callback = new AsyncCallback(AcceptCallBack);                    listener.BeginAcceptSocket(callback, listener);                }                //开始在连接上进行异步的数据接收                frd.ClearBuffer();                callback = new AsyncCallback(ReceiveCallback);                frd.socket.BeginReceive(frd.Rcvbuffer, 0, frd.Rcvbuffer.Length, SocketFlags.None, callback, frd);            }            catch            {                //在调用EndAcceptSocket方法时可能引发异常                //套接字Listener被关闭，则设置为未启动侦听状态                IsStart = false;            }        }

 private void ReceiveCallback(IAsyncResult ar)        {            MyFriend frd = (MyFriend)ar.AsyncState;            try            {                int i = frd.socket.EndReceive(ar);                data = Encoding.UTF8.GetString(frd.Rcvbuffer, 0, i);                int receiveNumber = frd.socket.Receive(frd.Rcvbuffer);                //SocketMassage是接收的结构体，用来拆解byte数组，可以根据自己定义的来处理                SocketMassage rcv_socmsg = new SocketMassage();                if (rcv_socmsg.msgType == "*1*")                {                拆byte数组头，                }                else if (rcv_socmsg.msgType == "*2*")                {                        byte[] sendBuffer = send_msg.getCombine();                        SendData(frd, sendBuffer);                }                else if (rcv_socmsg.msgType == "*3*")                {                }                else if (rcv_socmsg.msgType == "*4*")                {                }                frd.ClearBuffer();                AsyncCallback callback = new AsyncCallback(ReceiveCallback);                frd.socket.BeginReceive(frd.Rcvbuffer, 0, frd.Rcvbuffer.Length, SocketFlags.None, callback, frd);            }            catch            {            }        }

 private void SendCallback(IAsyncResult ar)        {            MyFriend frd = (MyFriend)ar.AsyncState;            try            {                frd.socket.EndSend(ar);            }            catch            {            }        }        private void SendData(MyFriend frd, byte[] data)        {            try            {                AsyncCallback callback = new AsyncCallback(SendCallback);                frd.socket.BeginSend(data, 0, data.Length, SocketFlags.None, callback, frd);            }            catch            {            }        }