Unity 网络编程(Socket)应用

服务器端的整体思路：

1、初始化IP地址和端口号以及套接字等字段；

2、绑定IP启动服务器，开始监听消息  socketServer.Listen(10)；

3、开启一个后台线程接受客户端的连接 socketServer.Accept()，这里需要注意的是服务器端有两个Socket，一个负责监听，另一个负责传输消息，分工明确；

4、接受客户端消息  socketMsg.Receive()；

5、向客户端发送消息 Send(bySendArray)；

6、当然还应该包括信息显示方法和系统的退出方法。

/***
 * 
 * 
 *  服务器端 
 * 
 */

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

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

public class Server : MonoBehaviour
{
    public InputField InpIPAdress;                              //IP地址
    public InputField InpPort;                                  //端口号
    public InputField InpDisplayInfo;                           //显示信息
    public InputField InpSendMsg;                               //发送信息
    public Dropdown Dro_IPList;                                 //客户端的IP列表

    private Socket socketServer;                                //服务端套接字
    private bool IsListionContect = true;                              //是否监听
    private StringBuilder _strDisplayInfo = new StringBuilder();//追加信息
    private string _CurClientIPValue = string.Empty;            //当前选择的IP地址
    //保存客户端通讯的套接字
    private Dictionary<string, Socket> _DicSocket = new Dictionary<string, Socket>();
    //保存DropDown的数据，目的为了删除节点信息
    private Dictionary<string, Dropdown.OptionData> _DicDropdowm = new Dictionary<string, Dropdown.OptionData>();

    // Start is called before the first frame update
    void Start()
    {
        //控件初始化
        InpIPAdress.text = "127.0.0.1";
        InpPort.text = "1000";
        InpSendMsg.text = string.Empty;
        
        //下拉列表处理
        Dro_IPList.options.Clear();                         //清空列表信息
        //添加一个空节点
        Dropdown.OptionData op = new Dropdown.OptionData();
        op.text = "";
        Dro_IPList.options.Add(op);
    }

    /// <summary>
    /// 退出系统
    /// </summary>
    public void ExitSystem()
    {
        //退出会话Socket

        //退出监听Socket
        if (socketServer != null)
        {
            try
            {
                socketServer.Shutdown(SocketShutdown.Both);     //关闭连接
            }
            catch (Exception)
            {
                
                throw;
            }
            socketServer.Close();                           //清理资源
        }
        Application.Quit();
    }

    /// <summary>
    /// 获取当前好友
    /// </summary>
    public void GetCurrentIPInformation()
    {
        //选择玩家当前列表
        _CurClientIPValue = Dro_IPList.options[Dro_IPList.value].text;
    }

    /// <summary>
    /// 服务端开始监听
    /// </summary>
    public void EnableServerReady()
    { 
        //需要绑定地址和端口号
        IPEndPoint endPoint = new IPEndPoint(IPAddress.Parse(InpIPAdress.text), Convert.ToInt32(InpPort.text));
        //定义监听Socket
        socketServer = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        //绑定
        socketServer.Bind(endPoint);

        //开始socket监听
        socketServer.Listen(10);
        //显示内容
        DisplayInfo("服务器端启动");

        //开启后台监听（监听客户端连接）
        Thread thClientCon = new Thread(ListionCilentCon);
        thClientCon.IsBackground = true;                    //后台线程
        thClientCon.Name = "thListionClientCon";
        thClientCon.Start();
    }

    /// <summary>
    /// 接听到客户端的连接
    /// </summary>
    private void ListionCilentCon()
    {
        Socket socMesgServer = null;                        //会话Socket

        try
        {
            while (IsListionContect)
            {
                //等待接受客户端连接，此处会“阻断”当前线程
                socMesgServer = socketServer.Accept();
                //获取远程节点信息
                string strClientIPAndPort = socketServer.RemoteEndPoint.ToString();
                //把远程节点信息添加到DropDown控件中
                Dropdown.OptionData op = new Dropdown.OptionData();
                op.text = strClientIPAndPort;
                Dro_IPList.options.Add(op);
                //把会话Socket添加到集合中（为后面发送信息使用）
                _DicSocket.Add(strClientIPAndPort, socMesgServer);
                //控件显示，有客户端连接
                DisplayInfo("有客户端连接");

                //开启后台线程，接受客户端信息
                Thread thClientMsg = new Thread(ReceivMsg);
                thClientMsg.IsBackground = true;
                thClientMsg.Name = "thListionClientMsg";
                thClientMsg.Start(socMesgServer);
            }
        }
        catch (Exception)
        {
            IsListionContect = false;
            //关闭会话Socket
            if (socketServer != null)
            {
                socketServer.Shutdown(SocketShutdown.Both);
                socketServer.Close();
            }
            if (socMesgServer != null)
            {
                socMesgServer.Shutdown(SocketShutdown.Both);
                socMesgServer.Close();
            }
        }
    }

    /// <summary>
    /// 后台线程，接受客户端信息
    /// </summary>
    /// <param name="sockMsg"></param>
    private void ReceivMsg(object sockMsg)
    {
        Socket socketMsg = sockMsg as Socket;

        try
        {
            while (true)
            {
                //准备接受数据缓存
                byte[] msgAarry = new byte[1024 * 0124];
                //准备接受客户端发来的套接字信息
                int trueClientMsgLenth = socketMsg.Receive(msgAarry);
                //byte数组转换为字符串
                string strMsg = System.Text.Encoding.UTF8.GetString(msgAarry, 0, trueClientMsgLenth);
                //显示接受的客户端消息内容
                DisplayInfo("客户端消息：" + strMsg);
            }
        }
        catch (Exception)
        {
        }
        finally
        {
            DisplayInfo("有客户端断开连接了：" + socketMsg.RemoteEndPoint.ToString());

            //字典类断开连接的客户端消息
            _DicSocket.Remove(socketMsg.RemoteEndPoint.ToString());
            //客户端列表移除
            if (_DicDropdowm.ContainsKey(socketMsg.RemoteEndPoint.ToString()))
            {
                Dro_IPList.options.Remove(_DicDropdowm[socketMsg.RemoteEndPoint.ToString()]);
            }
            //关闭Socket
            socketMsg.Shutdown(SocketShutdown.Both);
            socketMsg.Close();
        }
    
    }

    //向发送客户端会话
    public void SendMsg()
    { 
        //参数检查
        _CurClientIPValue = _CurClientIPValue.Trim();
        if (string.IsNullOrEmpty(_CurClientIPValue))
        {
            DisplayInfo("请选择要聊天的用户名称");
            return;
        }

        //判断是否与指定的Socket通信
        if (_DicSocket.ContainsKey(_CurClientIPValue))
        {
            //得到发送的消息
            string strSendMsg = InpSendMsg.text;
            strSendMsg = strSendMsg.Trim();

            if (!string.IsNullOrEmpty(strSendMsg))
            {
                //信息转码
                byte[] bySendArray = System.Text.Encoding.UTF8.GetBytes(strSendMsg);
                //发送数据
                _DicSocket[_CurClientIPValue].Send(bySendArray);
                //记录发送数据
                DisplayInfo("发送的数据：" + strSendMsg);

                //控件重置
                InpSendMsg.text = string.Empty;
            }
            else
            {
                DisplayInfo("发送的消息不能为空！");
            }
        }
        else
        {
            DisplayInfo("请选择合法的聊天用户！");
        }
    
    }

    /// <summary>
    /// 主显示控件，显示消息
    /// </summary>
    /// <param name="str"></param>
    private void DisplayInfo(string str)
    {
        str = str.Trim();
        if (!string.IsNullOrEmpty(str))
        {
            _strDisplayInfo.Append(System.DateTime.Now.ToString());
            _strDisplayInfo.Append("  ");
            _strDisplayInfo.Append(str);
            _strDisplayInfo.Append("
");
            InpDisplayInfo.text = _strDisplayInfo.ToString();
        }
    }

    // Update is called once per frame
    void Update()
    {
        
    }
}

客户端整体思路：

1、初始化IP地址和端口号以及一些显示信息和套接字；

2、启动客户端连接 _SockClient.Connect(endPoint)；

3、开启后台线程监听客户端发来的信息 _SockClient.Receive(byMsgArray)；

4、客户端发送数据到服务器  _SockClient.Send(byteArray)；

5、当然也应该包括退出系统和显示信息方法。

/***
 * 
 * 
 * 
 *  客户端 
 * 
 * 
 */
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

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

public class Client : MonoBehaviour
{
    public InputField InpIPAdress;                          //IP地址
    public InputField InpPort;                              //端口号
    public InputField InpDisplayInfo;                       //显示信息
    public InputField InpSendMsg;                           //发送信息

    private Socket _SockClient;                             //客户端Socket
    private IPEndPoint endPoint;
    private bool _IsSendDataConnection=true;                     //发送数据连接
    private StringBuilder _SbDisplayInfo = new StringBuilder();//控件追加信息

    // Start is called before the first frame update
    void Start()
    {
        InpIPAdress.text = "127.0.0.1";
        InpPort.text = "1000";
    }

    //客户端退出系统
    public void ExitSystem()
    { 
        //关闭客户端Socket
        if (_SockClient != null)
        {
            try
            {
                //关闭连接
                _SockClient.Shutdown(SocketShutdown.Both);
            }
            catch
            {
            }
            //清理资源
            _SockClient.Close();
        }

        //退出
        Application.Quit();
   
    }

    //启动客户端连接
    public void EnableClientCon()
    { 
        //通讯IP和端口号
        endPoint = new IPEndPoint(IPAddress.Parse(InpIPAdress.text), Convert.ToInt32(InpPort.text));
        //建立客户端Socket
        _SockClient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

        try
        {
            //建立连接
            _SockClient.Connect(endPoint);
            //启动线程，监听服务端返回的消息
            Thread thrListenMsgFromServer = new Thread(ListionMsgFromServer);
            thrListenMsgFromServer.IsBackground = true;
            thrListenMsgFromServer.Name = "thrListenMsgFromServer";
            thrListenMsgFromServer.Start();
        }
        catch (Exception)
        {
            
            throw;
        }
        //控件显示连接服务端成功
        DisplayInfo("连接服务器成功！");
    
    }

    /// <summary>
    /// 后台线程监听服务端返回的消息
    /// </summary>
    public void ListionMsgFromServer()
    {
        try
        {
            while (true)
            {
                //开辟消息内存区域
                byte[] byMsgArray = new byte[1024 * 0124];
                //客户端接受服务器返回的数据
                int intTrueMsgLengh = _SockClient.Receive(byMsgArray);
                //转化为字符串
                string strMsg = System.Text.Encoding.UTF8.GetString(byMsgArray, 0, intTrueMsgLengh);
                //显示收到的消息
                DisplayInfo("服务器返回消息：" + strMsg);
            }
        }
        catch
        {
        }
        finally
        {
            DisplayInfo("服务器断开连接");
            _SockClient.Disconnect(true);
            _SockClient.Close();
        }
    
    }

    //客户端发送数据到服务器
    public void SendMsg()
    {
        string strSendMsg = InpSendMsg.text;
        if (!string.IsNullOrEmpty(strSendMsg))
        {
            //字节转化
            byte[] byteArray = System.Text.Encoding.UTF8.GetBytes(strSendMsg);
            //发送
            _SockClient.Send(byteArray);
            //显示发送内容
            DisplayInfo("我:" + strSendMsg);

            //控件清空
            InpSendMsg.text = string.Empty;
        }
        else
        {
            DisplayInfo("提示：发送信息不能为空！");
        }
    }

    /// <summary>
    /// 主显示控件，显示消息
    /// </summary>
    /// <param name="str"></param>
    private void DisplayInfo(string str)
    {
        str = str.Trim();
        if (!string.IsNullOrEmpty(str))
        {
            _SbDisplayInfo.Append(System.DateTime.Now.ToString());
            _SbDisplayInfo.Append("  ");
            _SbDisplayInfo.Append(str);
            _SbDisplayInfo.Append("
");
            InpDisplayInfo.text = _SbDisplayInfo.ToString();
        }
    }

    // Update is called once per frame
    void Update()
    {
        
    }
}