Tcp小型即時對話訊息程式，基於C#的程式，伺服器端的代碼

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namespace SyncChatServer{    class User    {        public TcpClient client{get; private set;}        public BinaryReader br{get; private set;}        public BinaryWriter bw{get; private set;}        public string userName {get; set; }        public User(TcpClient client)        {            this.client = client;            NetworkStream networkStream = client.GetStream();            br = new BinaryReader(networkStream);            bw = new BinaryWriter(networkStream);        }        public void Close()        {            br.Close();            bw.Close();            client.Close();        }    }}//聲明了一個客戶的類User

using System;using System.Collections.Generic;using System.Windows.Forms;//添加的命名空間引用using System.Net;using System.Net.Sockets;using System.Threading;namespace SyncChatServer{    public partial class MainForm : Form    {        /// <summary>儲存串連的所有使用者</summary>        private List<User> userList = new List<User>();        /// <summary>使用的本機IP地址</summary>        IPAddress localAddress;        /// <summary>監聽連接埠</summary>        private const int port = 51888;        private TcpListener myListener;        /// <summary>是否正常退出所有接收線程</summary>        bool isNormalExit = false;        public MainForm()        {            InitializeComponent();            listBoxStatus.HorizontalScrollbar = true;            IPAddress[] addrIP = Dns.GetHostAddresses(Dns.GetHostName());            localAddress = addrIP[0];            buttonStop.Enabled = false;        }        /// <summary>【開始監聽】按鈕的Click事件</summary>        private void buttonStart_Click(object sender, EventArgs e)        {            myListener = new TcpListener(localAddress, port);            myListener.Start();            //調用string的靜態方法可以指定輸出的格式            AddItemToListBox(string.Format("開始在{0}:{1}監聽客戶串連", localAddress, port));            //建立一個線程監聽用戶端串連請求            Thread myThread = new Thread(ListenClientConnect);            myThread.Start();            buttonStart.Enabled = false;            buttonStop.Enabled = true;        }        /// <summary>接收用戶端串連</summary>        private void ListenClientConnect()        {            TcpClient newClient = null;            while (true)            {                try                {                    //在伺服器中，TcpClient對象必須要用AcceptTcpClient();方法擷取                    newClient = myListener.AcceptTcpClient();                }                catch                {                    //當單擊“停止監聽”或者退出此表單時AcceptTcpClient()會產生異常                    //因此可以利用此異常退出迴圈                    break;                }                //每接受一個用戶端串連,就建立一個對應的線程迴圈接收該用戶端發來的資訊                User user = new User(newClient);                Thread threadReceive = new Thread(ReceiveData);                threadReceive.Start(user);                userList.Add(user);                AddItemToListBox(string.Format("[{0}]進入", newClient.Client.RemoteEndPoint));                AddItemToListBox(string.Format("當前串連使用者數：{0}", userList.Count));            }        }       /// <summary>       /// 處理接收的用戶端資料       /// </summary>       /// <param name="userState">用戶端資訊</param>        private void ReceiveData(object userState)        {            User user = (User)userState;            TcpClient client = user.client;            while (isNormalExit == false)            {                string receiveString = null;                try                {                    //從網路流中讀出字串，此方法會自動判斷字串長度首碼，並根據長度首碼讀出字串                    receiveString = user.br.ReadString();                }                catch                {                    if (isNormalExit == false)                    {                        AddItemToListBox(string.Format("與[{0}]失去聯絡，已終止接收該使用者資訊", client.Client.RemoteEndPoint));                        RemoveUser(user);                    }                    break;                }                AddItemToListBox(string.Format("來自[{0}]：{1}", user.client.Client.RemoteEndPoint, receiveString));                string[] splitString = receiveString.Split(‘,‘);                switch (splitString[0])                {                    case "Login":                        user.userName = splitString[1];                        SendToAllClient(user, receiveString);                        break;                    case "Logout":                        SendToAllClient(user, receiveString);                        RemoveUser(user);                        return;                    case "Talk":                        string talkString = receiveString.Substring(splitString[0].Length + splitString[1].Length + 2);                        AddItemToListBox(string.Format("{0}對{1}說：{2}",                            user.userName, splitString[1], talkString));                        SendToClient(user, "talk," + user.userName + "," + talkString);                        foreach (User target in userList)                        {                            if (target.userName == splitString[1] && user.userName != splitString[1])                            {                                SendToClient(target, "talk," + user.userName + "," + talkString);                                break;                            }                        }                        break;                    default:                        AddItemToListBox("什麼意思啊：" + receiveString);                        break;                }            }        }        /// <summary>        /// 發送message給user        /// </summary>        /// <param name="user">指定發給哪個使用者</param>        /// <param name="message">資訊內容</param>        private void SendToClient(User user, string message)        {            try            {                //將字串寫入網路流，此方法會自動附加字串長度首碼                user.bw.Write(message);                user.bw.Flush();                AddItemToListBox(string.Format("向[{0}]發送：{1}",                    user.userName, message));            }            catch            {                AddItemToListBox(string.Format("向[{0}]發送資訊失敗",                    user.userName));            }        }        /// <summary>發送資訊給所有客戶</summary>        /// <param name="user">指定發給哪個使用者</param>        /// <param name="message">資訊內容</param>        private void SendToAllClient(User user, string message)        {            string command = message.Split(‘,‘)[0].ToLower();///////////////////////////////////////////////////////////////            if (command == "login")            {                for (int i = 0; i < userList.Count; i++)                {                    SendToClient(userList[i], message);//如果是登陸資訊，則發給每個使用者這個資訊                    if (userList[i].userName != user.userName)//如果是登陸資訊，則也要發給將要登陸的使用者已經登陸的使用者的名字                    {                        SendToClient(user, "login," + userList[i].userName);                    }                }            }            else if(command=="logout")//如果是登出，則發送給其餘的每個使用者登出的資訊            {                for (int i = 0; i < userList.Count; i++)                {                    if (userList[i].userName != user.userName)                    {                        SendToClient(userList[i], message);                    }                }            }        }        /// <summary>移除使用者</summary>        /// <param name="user">指定要刪除的使用者</param>        private void RemoveUser(User user)        {            userList.Remove(user);            user.Close();            AddItemToListBox(string.Format("當前串連使用者數：{0}", userList.Count));        }        private delegate void AddItemToListBoxDelegate(string str);        /// <summary>在ListBox中追加狀態資訊</summary>        /// <param name="str">要追加的資訊</param>        private void AddItemToListBox(string str)        {            if (listBoxStatus.InvokeRequired)            {                AddItemToListBoxDelegate d = AddItemToListBox;                listBoxStatus.Invoke(d, str);            }            else            {                listBoxStatus.Items.Add(str);                listBoxStatus.SelectedIndex = listBoxStatus.Items.Count - 1;                listBoxStatus.ClearSelected();            }        }        /// <summary>【停止監聽】按鈕的Click事件</summary>        private void buttonStop_Click(object sender, EventArgs e)        {            AddItemToListBox("開始停止服務，並依次使使用者退出!");            isNormalExit = true;            for (int i = userList.Count - 1; i >= 0; i--)            {                RemoveUser(userList[i]);            }            //通過停止監聽讓myListener.AcceptTcpClient()產生異常退出監聽線程            myListener.Stop();            buttonStart.Enabled = true;            buttonStop.Enabled = false;        }        /// <summary>關閉視窗時觸發的事件</summary>        private void MainForm_FormClosing(object sender, FormClosingEventArgs e)        {            if (myListener != null)            {                //引發buttonStop的Click事件                buttonStop.PerformClick();            }        }    }}

　　

 

Tcp小型即時對話訊息程式，基於C#的程式，伺服器端的代碼