unity_小功能实现（客户端相互通信功能）

服务器端：在VS中新建项目，用于服务器的搭建

using System;
using System.Collections.Generic;     
using System.Net.Sockets;
using System.Net;
using System.Text;
using System.Threading;

namespace Chat_Server
{
 
    class Client
    {
        private Socket clientSocket;
        private Thread t;
        private byte[] data = new byte[1024];//接收数据容器

static List<Client> clientList = new List<Client>();
         
        static void Main(string[] args)
        {
            Socket tcpServer = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);     
            tcpServer.Bind(new IPEndPoint(IPAddress.Parse("192.168.43.231"), 7788));
            tcpServer.Listen(100);

Console.WriteLine("server is runing");

//死循环：解决只能接收一个客户端的问题
            while (true)
            {
                Socket clientSocket = tcpServer.Accept();//暂停，当有客户端连接时执行下面代码
                Console.WriteLine("有一个客户端连接上了");
                Client client = new Client(clientSocket);
                clientList.Add(client);
            }

}   
        //是否连接成功，true为成功
        public bool Connected
        {
            get { return clientSocket.Connected; }
        }  
        public Client(Socket s)
        {
            clientSocket = s;
            //启动一个线程 处理客户端的数据接收
            t = new Thread(ReceiveMessage);
            t.Start();
        }
        //接收从客户端发送的消息
        private void ReceiveMessage()
        {
            //一直接收客户端的数据
            while (true)
            {
                //在接收数据之前  判断一下socket连接是否断开，等待10毫秒响应。断开连接时：
                if (clientSocket.Poll(10, SelectMode.SelectRead))
                {
                    clientSocket.Close();
                    break;//跳出循环 终止线程的执行
                }

//接收消息
                int length = clientSocket.Receive(data);
                string message = Encoding.UTF8.GetString(data, 0, length);
                
                BroadcastMessage(message);
                Console.WriteLine("收到了消息:" + message);
            }
        }       
        //服务器向客户端发消息
        public void SendMessage(string message)
        {
            byte[] data = Encoding.UTF8.GetBytes(message);
            clientSocket.Send(data);
        }
        //服务器端向客户端广播消息
        public static void BroadcastMessage(string message)
        {
            var notConnectedList = new List<Client>();
            foreach (var client in clientList)
            {
                if (client.Connected) //连接成功的广播消息
                    client.SendMessage(message);
                else  //连接失败的存储在另一个泛型集合里，方便后面移除
                {
                    notConnectedList.Add(client);
                }
            }
            //移除未连接的客户端
            foreach (var temp in notConnectedList)
            {
                clientList.Remove(temp);
            }
        }

}
}

Unity客户端：

using UnityEngine;
using System.Collections;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;

public class ChatManager : MonoBehaviour
{
    public string ipaddress = "192.168.43.231";
    public int port = 7788;

public UIInput textInput;
    public UILabel chatLabel;

private Socket clientSocket;
    private Thread t;

private byte[] data = new byte[1024];//数据容器
    private string message = "";//接收到的消息容器
    
    void Start () {
        ConnectToServer();
    }  
    void Update () {
        if (message != null && message != "")
        {
            chatLabel.text += "\n" + message;
            message = "";//清空消息
        }
    }
    void ConnectToServer()
    {
        clientSocket = new Socket(AddressFamily.InterNetwork,SocketType.Stream, ProtocolType.Tcp);
        //跟服务器端建立连接
        clientSocket.Connect( new IPEndPoint(IPAddress.Parse(ipaddress),port) );

//创建一个新的线程 用来接收消息
        t = new Thread(ReceiveMessage);
        t.Start();
    }
    //接收消息
    void ReceiveMessage()
    {
        while (true)
        {
            if (clientSocket.Connected == false)
                break;
            int length = clientSocket.Receive(data);
            message = Encoding.UTF8.GetString(data, 0, length);
            
        }
    }
    //发消息
    void SendMessage(string message)
    {
        byte[] data = Encoding.UTF8.GetBytes(message);
        clientSocket.Send(data);
    }
    //发送按钮
    public void OnSendButtonClick()
    {
        string value = textInput.value;
        SendMessage(value);
        textInput.value = "";
    }

void OnDestroy()
    {
        clientSocket.Shutdown(SocketShutdown.Both);
        
        clientSocket.Close();//关闭连接
    }
}
注意：我们在客户端和服务器端都使用了线程，线程的作用在于加快出库速度，提高性能。服务器端，使用线程接收数据，客户端使用线程发送数据。