Socket通信(TCP协议)

创建服务器：
①:创建一个用于监听连接的Socket对象；
②:用指定的端口号和服务器的Ip建立一个EndPoint对象；
③:用Socket对象的Bind()方法绑定EndPoint；
④:用Socket对象的Listen()方法开始监听；
⑤:接收到客户端的连接，用Socket对象的Accept()方法创建一个新的用于和客户端进行通信的Socket对象；
⑥:通信结束后一定记得关闭Socket。

	//1.创建服务器端
	Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);
	//2.创建IP与端口
	IPAddress iP = IPAddress.Parse(ip);
	IPEndPoint endPoint = new IPEndPoint(iP, int.Parse(8080));
	//3.将端口放到服务器中
	server.Bind(endPoint);
	//4.开始监听
	//同一时刻允许同时加入链接的最大数量
	server.Listen(20);
	listBox1.Items.Add("服务器已经成功开启!");
	//5.等待链接
	while (true)
	{
	  //接受接入的一个客户端
	  connectClient = server.Accept();
	  if (connectClient != null)
	  {
	      string info = connectClient.RemoteEndPoint.ToString();
	      clientList.Add(info, connectClient);
	      listBox1.Items.Add(info + "加入服务器!");
	      string msg = DateTime.Now + "你已经成功进入8080";
	      SendMsg(msg);
	      //每有一个客户端接入,需要有一个线程进行服务
	      Thread threadclient = new Thread(ReciveMsg);
	      threadclient.IsBackground = true;
	      //设置这个线程中的通信对象时对应的socket与客户端socket进行通信
	      threadclient.Start(connectClient);
	  }
	}
	 void ReciveMsg(object o)
        {
            Socket client = o as Socket;
            while (true)
            {
                try
                {
                    byte[] arrMsg = new byte[1024 * 1024];
                    int length = client.Receive(arrMsg);
                    if (length > 0)
                    {
                        string recMsg = Encoding.UTF8.GetString(arrMsg, 0, length);
                        IPEndPoint endPoint = client.RemoteEndPoint as IPEndPoint;
                        listBox1.Items.Add(DateTime.Now + "[" + endPoint.Port.ToString() + "]" + recMsg);
                        SendMsg("[" + endPoint.Port.ToString() + "]" + recMsg);
                    }
                }
                catch (Exception)
                {
                    client.Close();
                    clientList.Remove(client.RemoteEndPoint.ToString());
                }
            }
        }       

创建客户端

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace _01socket客户端
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            CheckForIllegalCrossThreadCalls = false;
        }
        Socket client;

        private void button1_Click(object sender, EventArgs e)
        {
            client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);

            IPAddress ip = IPAddress.Parse(textBox1.Text);
            IPEndPoint endpoint = new IPEndPoint(ip, int.Parse(textBox2.Text));

            client.Connect(endpoint);

            Thread thread = new Thread(ReciveMsg);
            thread.IsBackground = true;
            thread.Start(client);
        }
        /// <summary>
        /// 接受数据
        /// </summary>
        /// <param name="o"></param>
        void ReciveMsg(object o)
        {
            client = o as Socket;
            while (true)
            {
                byte[] arrlist = new byte[1024 * 1024];
                int length = client.Receive(arrlist);
                string msg = DateTime.Now + Encoding.UTF8.GetString(arrlist, 0, length);
                listBox1.Items.Add(msg);
            }
        }

        void SendMsg(string msg)
        {
            byte[] arrmsg = Encoding.UTF8.GetBytes(msg);
            client.Send(arrmsg);
        }
        private void button2_Click(object sender, EventArgs e)
        {
            if (textBox3.Text != "")
            {
                SendMsg(textBox3.Text);
                textBox3.Text = "";
            }
        }
    }
}