socket学习之聊天室

服务端

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Windows.Forms;
 
namespace SocketServer
{
    public partial class Form1 : Form
    {
        /// <summary>
        /// 保存连接的所有用户
        /// </summary>
        private List<User> userList = new List<User>();
 
        /// <summary>
        /// 服务器IP地址
        /// </summary>;
        private string ServerIP;
 
        /// <summary>
        /// 监听端口
        /// </summary>
        private int port;
        private TcpListener myListener;
 
        /// <summary>
        /// 是否正常退出所有接收线程
        /// </summary>
        bool isNormalExit = false;
 
        public Form1()
        {
            InitializeComponent();
            btn_Stop.Enabled = false;
            SetServerIPAndPort();
        }
 
        /// <summary>
        /// 根据当前程序目录的文本文件‘ServerIPAndPort.txt’内容来设定IP和端口
        /// 格式：127.0.0.1:8885
        /// </summary>
        private void SetServerIPAndPort()
        {
            FileStream fs = new FileStream("ServerIPAndPort.txt", FileMode.Open);
            StreamReader sr = new StreamReader(fs);
            string IPAndPort = sr.ReadLine();
            ServerIP = IPAndPort.Split(':')[]; //设定IP
            port = int.Parse(IPAndPort.Split(':')[]); //设定端口
            sr.Close();
            fs.Close();
        }
 
        /// <summary>
        /// 开始监听
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btn_Start_Click(object sender, EventArgs e)
        {
            ListenClient();
        }
 
        /// <summary>
        /// 开始服务，监听客户端
        /// </summary>
        private void ListenClient()
        {
            myListener = new TcpListener(IPAddress.Parse(ServerIP), port);
            myListener.Start();
            AddTalkMessage(string.Format("开始在{0}:{1}监听客户连接", ServerIP, port));
            //创建一个线程监客户端连接请求
            Thread myThread = new Thread(ListenClientConnect);
            myThread.Start();
            btn_Start.Enabled = false;
            btn_Stop.Enabled = true;
        }
 
        /// <summary>
        /// 接收客户端连接
        /// </summary>
        private void ListenClientConnect()
        {
            TcpClient newClient = null;
            while (true)
            {
                try
                {
                    newClient = myListener.AcceptTcpClient();
                }
                catch
                {
                    //当单击‘停止监听’或者退出此窗体时 AcceptTcpClient() 会产生异常
                    //因此可以利用此异常退出循环
                    break;
                }
                //每接收一个客户端连接，就创建一个对应的线程循环接收该客户端发来的信息；
                User user = new User(newClient);
                Thread threadReceive = new Thread(ReceiveData);
                threadReceive.Start(user);
                userList.Add(user);
                AddTalkMessage(string.Format("[{0}]进入", newClient.Client.RemoteEndPoint));
                AddTalkMessage(string.Format("当前连接用户数：{0}", userList.Count));
            }
 
        }
 
        /// <summary>
        /// 处理接收的客户端信息
        /// </summary>
        /// <param name="userState">客户端信息</param>
        private void ReceiveData(object userState)
        {
            User user = (User)userState;
            TcpClient client = user.client;
            while (isNormalExit == false)
            {
                string receiveString = null;
                try
                {
                    //从网络流中读出字符串，此方法会自动判断字符串长度前缀
                    receiveString = user.br.ReadString();
                }
                catch (Exception)
                {
                    if (isNormalExit == false)
                    {
                        AddTalkMessage(string.Format("与[{0}]失去联系，已终止接收该用户信息", client.Client.RemoteEndPoint));
                        RemoveUser(user);
                    }
                    break;
                }
                AddTalkMessage(string.Format("来自[{0}]：{1}", user.client.Client.RemoteEndPoint, receiveString));
                string[] splitString = receiveString.Split(',');
                switch (splitString[])
                {
                    case "Login":
                        user.userName = splitString[];
                        SendToAllClient(user, receiveString);
                        break;
                    case "Logout":
                        SendToAllClient(user, receiveString);
                        RemoveUser(user);
                        return;
                    case "AllTalk":
                        string allTalkString = receiveString.Substring(splitString[].Length + splitString[].Length + );
                        AddTalkMessage(string.Format("{0}说：{1}", user.userName, allTalkString));
                        for (int i = ; i < userList.Count; i++)
                        {
                            SendToClient(userList[i], "talk," + user.userName + "," + allTalkString);
                        }
                        break;
                    case "Talk":
                        string talkString = receiveString.Substring(splitString[].Length + splitString[].Length + );
                        AddTalkMessage(string.Format("{0}对{1}说：{2}", user.userName, splitString[], talkString));
                        SendToClient(user, "talk," + "你对"+ splitString[] + "说," + talkString);//发给自己
                        foreach (User target in userList)//发给对方
                        {
                            if (target.userName == splitString[] && user.userName != splitString[])
                            {
                                SendToClient(target, "talk," + user.userName + "对你说," + talkString);
                                break;
                            }
                        }
                        break;
                    default:
                        AddTalkMessage("错误：" + receiveString);
                        break;
                }
            }
        }
 
        /// <summary>
        /// 发送消息给所有客户
        /// </summary>
        /// <param name="user">指定发给哪个用户</param>
        /// <param name="message">信息内容</param>
        private void SendToAllClient(User user, string message)
        {
            string command = message.Split(',')[].ToLower();
            if (command == "login")
            {
                //获取所有客户端在线信息到当前登录用户
                for (int i = ; i < userList.Count; i++)
                {
                    SendToClient(user, "login," + userList[i].userName);
                }
                //把自己上线，发送给所有客户端
                for (int i = ; i < userList.Count; i++)
                {
                    if (user.userName != userList[i].userName)
                    {
                        SendToClient(userList[i], "login," + user.userName);
                        SendToClient(userList[i], "talk,服务器：" + user.userName + "已上线,");
                    }
                }
            }
            else if (command == "logout")
            {
                for (int i = ; i < userList.Count; i++)
                {
                    if (userList[i].userName != user.userName)
                    {
                        SendToClient(userList[i], message);
                        SendToClient(userList[i], "talk,服务器：" + user.userName + "已下线,");
                    }
                }
            }
        }
 
        /// <summary>
        /// 发送 message 给 user
        /// </summary>
        /// <param name="user">指定发给哪个用户</param>
        /// <param name="message">信息内容</param>
        private void SendToClient(User user, string message)
        {
            try
            {
                //将字符串写入网络流，此方法会自动附加字符串长度前缀
                user.bw.Write(message);
                user.bw.Flush();
                AddTalkMessage(string.Format("向[{0}]发送：{1}", user.userName, message));
            }
            catch
            {
                AddTalkMessage(string.Format("向[{0}]发送信息失败", user.userName));
            }
        }
 
        /// <summary>
        /// 移除用户
        /// </summary>
        /// <param name="user">指定要移除的用户</param>
        private void RemoveUser(User user)
        {
            userList.Remove(user);
            user.Close();
            AddTalkMessage(string.Format("当前连接用户数：{0}", userList.Count));
        }
 
        private delegate void AddTalkMessageDelegate(string message);
        /// <summary>
        /// 在聊天对话框（txt_Message）中追加聊天信息
        /// </summary>
        /// <param name="str">要追加的信息</param>
        private void AddTalkMessage(string message)
        {
            if (txt_Message.InvokeRequired)
            {
                AddTalkMessageDelegate d = new AddTalkMessageDelegate(AddTalkMessage);
                txt_Message.Invoke(d, new object[] { message });
            }
            else
            {
                txt_Message.AppendText(message + Environment.NewLine);
                txt_Message.ScrollToCaret();
            }
        }
 
        /// <summary>
        /// 停止监听
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btn_Stop_Click(object sender, EventArgs e)
        {
            stopListen();
        }
 
        private void stopListen()
        {
            AddTalkMessage("开始停止服务，并依次使用户退出！");
            isNormalExit = true;
            for (int i = userList.Count - ; i >= ; i--)
            {
                RemoveUser(userList[i]);
            }
            //通过停止监听让 myListener.AcceptTcpClient() 产生异常退出监听线程
            myListener.Stop();
            btn_Start.Enabled = true;
            btn_Stop.Enabled = false;
        }
 
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (myListener != null)
                stopListen();//btn_Stop.PerformClick();    //引发 btn_Stop 的Click事件
        }
 
        private void btn_send_Click(object sender, EventArgs e)
        {
            for (int i = ; i < userList.Count; i++)
            {
                SendToClient(userList[i], "talk,服务器," + talk.Text + "\r\n");
            }
            talk.Clear();
        }
 
        private void talk_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == (char)Keys.Return)
            {
                //触发【发送】按钮的单击事件
                btn_send.PerformClick();
            }
        }
 
    }
}

using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Sockets;
using System.IO;
 
namespace SocketServer
{
    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();
        }
 
    }
}

客户端

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Windows.Forms;
 
namespace SocketClient
{
    public partial class Form1 : Form
    {
        private string ServerIP; //IP
        private int port;   //端口
        private bool isExit = false;
        private TcpClient client;
        private BinaryReader br;
        private BinaryWriter bw;
 
        public Form1()
        {
            InitializeComponent();
            Random r = new Random((int)DateTime.Now.Ticks);
            txt_UserName.Text = "user" + r.Next(, );
            lst_OnlineUser.HorizontalScrollbar = true;
            lst_OnlineUser.Items.Add("所有人");
            lst_OnlineUser.SelectedIndex = ;
            SetServerIPAndPort();
        }
 
        /// <summary>
        /// 根据当前程序目录的文本文件‘ServerIPAndPort.txt’内容来设定IP和端口
        /// 格式：127.0.0.1:8885
        /// </summary>
        private void SetServerIPAndPort()
        {
            try
            {
                FileStream fs = new FileStream("ServerIPAndPort.txt", FileMode.Open);
                StreamReader sr = new StreamReader(fs);
                string IPAndPort = sr.ReadLine();
                ServerIP = IPAndPort.Split(':')[]; //设定IP
                port = int.Parse(IPAndPort.Split(':')[]); //设定端口
                sr.Close();
                fs.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show("配置IP与端口失败，错误原因：" + ex.Message);
                Application.Exit();
            }
        }
 
        /// <summary>
        /// 打开客户端，即连接服务器
        /// </summary>
        private void ConnectServer()
        {
            btn_Login.Enabled = false;
            try
            {
                //此处为方便演示，实际使用时要将Dns.GetHostName()改为服务器域名
                //IPAddress ipAd = IPAddress.Parse("182.150.193.7");
                client = new TcpClient();
                client.Connect(IPAddress.Parse(ServerIP), port);
                AddTalkMessage("连接成功\r\n");
            }
            catch (Exception ex)
            {
                AddTalkMessage("连接失败，原因：" + ex.Message + "\r\n");
                btn_Login.Enabled = true;
                return;
            }
            //获取网络流
            NetworkStream networkStream = client.GetStream();
            //将网络流作为二进制读写对象
            br = new BinaryReader(networkStream);
            bw = new BinaryWriter(networkStream);
            SendMessage("Login," + txt_UserName.Text);
            Thread threadReceive = new Thread(new ThreadStart(ReceiveData));
            threadReceive.IsBackground = true;
            threadReceive.Start();
        }
 
        /// <summary>
        /// 【登陆】按钮事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btn_Login_Click(object sender, EventArgs e)
        {
            ConnectServer();
        }
 
        /// <summary>
        /// 处理服务器信息
        /// </summary>
        private void ReceiveData()
        {
            string receiveString = null;
            while (isExit == false)
            {
                try
                {
                    //从网络流中读出字符串
                    //此方法会自动判断字符串长度前缀，并根据长度前缀读出字符串
                    receiveString = br.ReadString();
                }
                catch
                {
                    if (isExit == false)
                    {
                        MessageBox.Show("与服务器失去连接");
                    }
                    break;
                }
                string[] splitString = receiveString.Split(',');
                string command = splitString[].ToLower();
                switch (command)
                {
                    case "login":   //格式： login,用户名
                        AddOnline(splitString[]);
                        break;
                    case "logout":  //格式： logout,用户名
                        RemoveUserName(splitString[]);
                        break;
                    case "talk":    //格式： talk,用户名,对话信息
                        AddTalkMessage(splitString[] + "：\r\n");
                        AddTalkMessage(receiveString.Substring(splitString[].Length + splitString[].Length + ) + "\r\n");
                        break;
                    default:
                        AddTalkMessage("错误：" + receiveString + "\r\n");
                        break;
                }
            }
            Application.Exit();
        }
 
        /// <summary>
        /// 向服务端发送消息
        /// </summary>
        /// <param name="message"></param>
        private void SendMessage(string message)
        {
            try
            {
                //将字符串写入网络流，此方法会自动附加字符串长度前缀
                bw.Write(message);
                bw.Flush();
            }
            catch
            {
                AddTalkMessage("发送失败\r\n");
            }
        }
 
        private delegate void AddTalkMessageDelegate(string message);
        /// <summary>
        /// 在聊天对话框（txt_Message）中追加聊天信息
        /// </summary>
        /// <param name="message"></param>
        private void AddTalkMessage(string message)
        {
            if (txt_Message.InvokeRequired)
            {
                AddTalkMessageDelegate d = new AddTalkMessageDelegate(AddTalkMessage);
                txt_Message.Invoke(d, new object[] { message });
            }
            else
            {
                txt_Message.AppendText(message);
                txt_Message.ScrollToCaret();
            }
        }
 
        private delegate void AddOnlineDelegate(string message);
        /// <summary>
        /// 在在线框（lst_Online)中添加其他客户端信息
        /// </summary>
        /// <param name="userName"></param>
        private void AddOnline(string userName)
        {
            if (lst_OnlineUser.InvokeRequired)
            {
                AddOnlineDelegate d = new AddOnlineDelegate(AddOnline);
                lst_OnlineUser.Invoke(d, new object[] { userName });
            }
            else
            {
                lst_OnlineUser.Items.Add(userName);
                lst_OnlineUser.SelectedIndex = lst_OnlineUser.Items.Count - ;
                lst_OnlineUser.ClearSelected();
            }
        }
 
        private delegate void RemoveUserNameDelegate(string userName);
        /// <summary>
        /// 在在线框(lst_Online)中移除不在线的客户端信息
        /// </summary>
        /// <param name="userName"></param>
        private void RemoveUserName(string userName)
        {
            if (lst_OnlineUser.InvokeRequired)
            {
                RemoveUserNameDelegate d = new RemoveUserNameDelegate(RemoveUserName);
                lst_OnlineUser.Invoke(d, userName);
            }
            else
            {
                lst_OnlineUser.Items.Remove(userName);
                lst_OnlineUser.SelectedIndex = lst_OnlineUser.Items.Count - ;
                lst_OnlineUser.ClearSelected();
            }
        }
 
        /// <summary>
        /// 【发送】按钮单击事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btn_Send_Click(object sender, EventArgs e)
        {
            if (txt_SendText.Text == "")
            {
                MessageBox.Show("发送不能为空！");
                return;
            }
            if (lst_OnlineUser.Text == "所有人" || lst_OnlineUser.Text == "")
            {
                SendMessage("AllTalk,all," + txt_SendText.Text + "\r\n");
            }
            else
            {
                SendMessage("Talk," + lst_OnlineUser.SelectedItem + "," + txt_SendText.Text + "\r\n");
            }
            txt_SendText.Clear();
        }
 
        /// <summary>
        /// 在发送信息的文本框中按下【Enter】键触发的事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void txt_SendText_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == (char)Keys.Return)
            {
                txt_SendText.Text = txt_SendText.Text.Substring(, txt_SendText.Text.Length - );
                //触发【发送】按钮的单击事件
                btn_Send.PerformClick();
            }
        }
 
        /// <summary>
        /// 窗体关闭事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            //未与服务器连接前 client 为 null
            if (client != null)
            {
                try
                {
                    SendMessage("Logout," + txt_UserName.Text);
                    isExit = true;
                    br.Close();
                    bw.Close();
                    client.Close();
                }
                catch
                {
                }
            }
        }
 
    }
}

实现效果：