Socket编程服务器和客户端（多个客户端可以同时连接一个服务器的同一端口）

服务器端代码

using System;

using System.Collections.Generic;

using System.Text;

using System.Net;

using System.Net.Sockets;

using System.Threading;

namespace TCP通信

{

    class Program

    {

        static void Main(string[] args)

        {

            try

            {

                //把ip地址转换为实例

                IPAddress ipa = IPAddress.Parse("127.0.0.1");

                //监听端口8001

                TcpListener mylsn = new TcpListener(ipa, 8001);

                //开启监听

                mylsn.Start();

                //输出监听成功的信息

                Console.WriteLine("在8001启动服务，等待连接");

                //等待处理接入连接请求

                while (true)

                {

                    Socket mysock = mylsn.AcceptSocket();

                    Console.WriteLine("有连接，连接来自" + mysock.RemoteEndPoint);

                    work w = new work();

                    w.mysock = mysock;

                    w.mylsn = mylsn;

                    Thread t = new Thread(new ThreadStart(w.main));

                    t.Start(); 

                }

            }

            catch

            { }

            finally

            { }

        }

    }

    public class work

    {

        public Socket mysock;

        public TcpListener mylsn;

        public void main()

        {

            //接收客户端消息

            byte[] data = new byte[100];

            mysock.Receive(data);

            string rt = System.Text.UTF8Encoding.UTF8.GetString(data);

            Console.WriteLine(rt);

            //给客户端发消息

            mysock.Send(UTF8Encoding.UTF8.GetBytes("回发给客户端"));

            //释放资源

            mysock.Close();

            mylsn.Stop();

        }

    }

}

客户端代码

using System;

using System.Collections.Generic;

using System.Text;

using System.IO;

using System.Net;

using System.Net.Sockets;

namespace TCP通信客户端

{

    public class Class1

    {

        public static void Main()

        {

            //新建客户端套接字

            TcpClient tclient = new TcpClient();

            //连接服务器

            tclient.Connect("127.0.0.1", 8001);

            Console.WriteLine("输入要发送的消息");

            //读入要传输的字符

            string str = Console.ReadLine();

           

            //得到流

            Stream stm = tclient.GetStream();

            //发送字符串

            ASCIIEncoding asen = new ASCIIEncoding();

            byte[] data = asen.GetBytes(str);

            stm.Write(data, 0, data.Length);

            //接受服务器返回的消息

            byte[] back = new byte[100];

            int k = stm.Read(back, 0, 100);

            //输出服务器返回的消息

            for (int i = 0; i < k; i++)

            {

                Console.Write(Convert.ToChar(back[i]));

            }

            //关闭连接

            tclient.Close();

        }

    }

}