服务端与客户端交互（二）

1.增加服务端异步的消息接收

2.修改服务器端开启异步处理客户端的请求

3.处理服务端处理客户端的连接正常关闭和非正常关闭

1.异步接收客户端发送过来的消息，上一篇接受客户端消息是在主线程中等待客户端发送，会造成主线程运行阻塞，这里调整为异步接受

主要方法：BeginReceive（字节数组，数组读取偏移，读取长度，SocketFlags.None，相应异步操作完成时回调方法，接受操作的相关信息）；//开始监听客户端数据的传递，当接收到客户端数据时才调用传入的回调函数

2.同时接受多个客户端发送的消息。

主要方法：BeginAccept（相应异步操作完成时回调方法，接受操作的相关信息）//开始一个异步操作来接受一个传入的链接尝试。

3.客户端非正常关闭时服务端会抛出异常，客户端关闭是通知服务端

Try{}catch(){}捕捉异常处理

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Net.Sockets;using System.Net;namespace JungleWarServer{    class Program    {        static void Main(string[] args)        {            StartServerAsync();            //StartServerSync();            Console.ReadKey();        }        static void StartServerAsync()        {            //1.创建服务端套接字            Socket serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            //2.创建服务端ip地址与端口号            IPAddress ipAddress = IPAddress.Parse("127.0.0.1");            IPEndPoint ipEndPoint = new IPEndPoint(ipAddress, 666);            //3.服务端与ip地址端口号绑定            serverSocket.Bind(ipEndPoint);            serverSocket.Listen(50);//开始监听端口号，处理链接的队列            //Socket clientSocket = serverSocket.Accept();//接收一个客户端链接            serverSocket.BeginAccept(StartClientServerAsync, serverSocket);        }        private static void StartClientServerAsync(IAsyncResult ar)        {            Socket serverSocket = ar.AsyncState as Socket;            Socket clientSocket = serverSocket.EndAccept(ar);            //向客户端发送消息            string str = "Hello ！客户端。。。";            byte[] data = System.Text.Encoding.UTF8.GetBytes(str);            clientSocket.Send(data);            //异步接收客户端发送的消息，异步不阻塞主线程            //开始监听客户端数据的传递，当接收到客户端数据时才调用传入的回调函数            clientSocket.BeginReceive(dataBuffer, 0, 1024, SocketFlags.None, ReceiveCallBack, clientSocket);            serverSocket.BeginAccept(StartClientServerAsync, serverSocket);                    }        static byte[] dataBuffer = new byte[1024];        private static void ReceiveCallBack(IAsyncResult ar)        {            Socket clientSocket =null;            try            {                clientSocket = ar.AsyncState as Socket;                int count = clientSocket.EndReceive(ar);                if (count==0)                {                    clientSocket.Close();                    return;                }                string strReceive = Encoding.UTF8.GetString(dataBuffer, 0, count);                Console.WriteLine(strReceive);                clientSocket.BeginReceive(dataBuffer, 0, 1024, SocketFlags.None, ReceiveCallBack, clientSocket);            }            catch (Exception ex)            {                Console.WriteLine(ex.Message);                if (clientSocket!=null)                {                    clientSocket.Close();                }            }                  }       static void StartServerSync()        {            //1.创建服务端套接字            Socket serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            //2.创建服务端ip地址与端口号            IPAddress ipAddress = IPAddress.Parse("127.0.0.1");            IPEndPoint ipEndPoint = new IPEndPoint(ipAddress, 666);            //3.服务端与ip地址端口号绑定            serverSocket.Bind(ipEndPoint);            serverSocket.Listen(50);//开始监听端口号，处理链接的队列            Socket clientSocket = serverSocket.Accept();//接收一个客户端链接            //向客户端发送消息            string str = "Hello ！客户端。。。";            byte[] data = System.Text.Encoding.UTF8.GetBytes(str);            clientSocket.Send(data);            //接收客户端发送的消息            byte[] dataBuffer = new byte[1024];            int count = clientSocket.Receive(dataBuffer);//接收到的消息存储进数组缓存区，返回存储的长度。            string msgReceive = Encoding.UTF8.GetString(dataBuffer, 0, count); //字节数组转为消息，需指定长度            Console.WriteLine(msgReceive);            Console.ReadKey();            serverSocket.Close();        }    }}

客户端

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Net.Sockets;using System.Net;using System.Collections;namespace JungleWarClient{    class Program    {        static void Main(string[] args)        {            Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            clientSocket.Connect(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 666));            //接收从服务器发送过来的消息            byte[] data = new byte[1024];            int count = clientSocket.Receive(data);            string strReceive = Encoding.UTF8.GetString(data, 0, count);            Console.WriteLine(strReceive);            //向服务器发送消息            while (true)            {                string strSend = Console.ReadLine();                if (strSend=="c")                {                    clientSocket.Close();                    return;                }                byte[] dataSend = Encoding.UTF8.GetBytes(strSend);                clientSocket.Send(dataSend);            }        }    }}