socket编程

SOCKET用于在两个基于TCP/IP协议的应用程序之间相互通信

首先先引用

using System.Net;
using System.Net.Sockets;

使用说明：先执行Server,再执行Client

Server 服务器端

 static void Main(string[] args)
        {
            int port = 2000;
            string host = "127.0.0.1";
            /**/
            ///创建终结点(EndPoint)

            IPAddress ip = IPAddress.Parse(host);//把Ip地址字符串转 换为IPAddress类型的实例
            IPEndPoint ipe = new IPEndPoint(ip, port);//用指定的端口和ip初始化IPEndPoint类的新实例

            /**/
            ///创建socket并开始监听
            //创建一个socket对象，如果用udp协议，则要用SocketType.Dgram类型的套接字
            Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            s.Bind(ipe);//绑定EndPoint对象（2000端口和ip地址）
            s.Listen(0);//开始监听
            Console.WriteLine("等待客户端连接");
            Console.ReadLine();


            /**/
            ///接受到client连接，为此连接建立新的socket,并接受信息
            Socket temp = s.Accept();//为新建连接创建新的socket
            Console.WriteLine("建立连接");
            string recvStr = "";
            byte[] recvBytes = new byte[1024];
            int bytes;
            bytes = temp.Receive(recvBytes,recvBytes.Length,0);//从客户端接受信息
            recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes);
            Console.ReadLine();


            /**/
            ///给client端返回信息
            Console.WriteLine("server get message:{0}",recvStr);//把客户端传来的信息显示出来;
            string sendStr = "ok!Client send message successful!";
            byte[] bs = Encoding.ASCII.GetBytes(sendStr);
            temp.Send(bs,bs.Length,0);//返回信息给客户端
            temp.Close();
            s.Close();
            Console.ReadLine();

        }

Client 客户端

 static void Main(string[] args)
        {
            try
            {  
                int port = 2000;
                string host = "127.0.0.1";

                /**/
                ///创建终结点EndPoint
                IPAddress ip = IPAddress.Parse(host);
                IPEndPoint ipe = new IPEndPoint(ip,port);//把ip和端口转化为IPEndpoint实例


                /**/
                ///创建socket并连接到服务器
                Socket c = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//创建Socket
                Console.WriteLine("Conneting...");
                c.Connect(ipe);//连接到服务器

        
                /**/
                ///向服务器发送信息
                string sendStr = "hello! This is a socket test";
                byte[] bs = Encoding.ASCII.GetBytes(sendStr);//把字符串编码为字节
                Console.WriteLine("Send Message");
                c.Send(bs,bs.Length,0);//发送信息

                /**/
                ///接受从服务器返回的信息
                string recvStr = "";
                byte[] recvBytes = new byte[1024];
                int bytes;
                bytes = c.Receive(recvBytes,recvBytes.Length,0);//从服务器端接受返回信息
                recvStr += Encoding.ASCII.GetString(recvBytes,0,bytes);
                Console.WriteLine("client get message:{0}",recvStr);//显示服务器返回信息
                Console.ReadLine();

                /**/
                ///一定记着用完socket后要关闭t
                c.Close();

            }
            catch (ArgumentNullException e)
            {
                Console.WriteLine("argumentNullException: {0}", e);
            }
            catch (SocketException e)
            {
                Console.WriteLine("SocketException:{0}", e);
            }

            Console.WriteLine("Press Enter to Exit");

        }