关于客户端和服务端聊天室的思路和代码（主要参考传智播客讲课）

服务端的代码：

 

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Net.Sockets;using System.Net;using System.Threading;using System.IO;namespace ItcastSocketTest{    /// <summary>    /// 基本思路一、关于套接字二、关于线程    /// 1.1、客户端要本地的ip和一个socket相关联--通过socketWatch.Bind(endpoint);完成    /// 1.2、完成关联之后就开始用用“第一线程watchTread” 监听    /// 1.3、监听到客户端之后，服务端会再创建一个负责与客户端通信的socket----socketConnetion    /// 2.1、客户端与服务端的通信都通过socketConnetion来实现 包括send receive    /// 2.2、当服务当接收信息时，要创建一个新的“第二线程recieveTread”，防止冲突    /// 为什么发送不用创建线程    /// 因为发送消息的时间服务器不用对自己监听 当客户端发送消息时， 服务端要对其监听    /// </summary>    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();                        TextBox.CheckForIllegalCrossThreadCalls = false;        }        Thread watchTread=null;//创建一个线程，防止线程“死等”事件的发生        Thread recieveTread = null;//创建一个接收线程，        Socket socketWatch=null;//创建一个套接字用来获取服务器的ip和端口        Socket socketConnetion = null;//链接成功后返回一个套接字        Dictionary<string,Socket> dtSocket=new Dictionary<string,Socket>();//创建一个字段，用来实现服务端向多个客户端发送信息        Dictionary<string, Thread> dtThread = new Dictionary<string, Thread>();//创建一个字段，用来实现服务端向多个客户端发送信息        /// <summary>        /// 启动服务端        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void BtnBeginServer_Click(object sender, EventArgs e)        {   //创建服务器线程 负责监听的套接字            socketWatch = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            IPAddress address = IPAddress.Parse(txtIP.Text.ToString());            IPEndPoint endpoint = new IPEndPoint(address, int.Parse(txtPort.Text.Trim()));            //=========================================================            socketWatch.Bind(endpoint);//将负责监听的套接字绑定到指定的ip和端口上            socketWatch.Listen(10);            //=======================================================            //创建监听线程，防止UI线程与监听线程冲突            watchTread = new Thread(WatchConnection);            watchTread.IsBackground = true;            watchTread.Start();            //========================================================            //创建客户端向客户端发送消息进程            //clientToClientThread = new Thread(recieveAndSend);            //clientToClientThread.IsBackground = false;            //clientToClientThread.Start();            MsgShow("服务器监听成功！");        }        /// <summary>        /// 链接服务端        /// </summary>        void WatchConnection()        {               while(true)            {                socketConnetion = socketWatch.Accept();//一旦监听成功将返回一个链接套接字                string strClient = socketConnetion.RemoteEndPoint.ToString();//获取远程客户端的ip和port信息                lbClientList.Items.Add(strClient);                dtSocket.Add(strClient, socketConnetion);                //=======================================================                //创建接收消息进程                recieveTread = new Thread(recievInfo);//当服务端接收消息时会和ui线程冲突，新建线程                recieveTread.IsBackground = false;                recieveTread.Start(socketConnetion);                dtThread.Add(strClient,recieveTread);                MsgShow("连接服务器成功！！" + strClient);            }        }        #region 接受消息委托--recievInfo(Object socketpara)        /// <summary>        /// 接收消息        /// </summary>        void recievInfo(Object socketpara)        {            Socket socketRecieve = socketpara as Socket;            while (true)            {                Byte[] arrMsgRec = new byte[1024 * 1024 * 2]; //用来储存接收服务端的二进制数据                //接收到文件的长度                int length = socketRecieve.Receive(arrMsgRec);//完成了接受传过来的二进制数据，并且返回一个整形数值                if (arrMsgRec[0] == 0)                {                    //把接收到的消息转化成string类型                    string strMsgRec = System.Text.Encoding.UTF8.GetString(arrMsgRec, 1, length);                    MsgShow(strMsgRec);                }                else if (arrMsgRec[0] == 1)                {                    SaveFileDialog sfd = new SaveFileDialog();                    if (sfd.ShowDialog(this) == DialogResult.OK)                    {                        string fileSavePath = sfd.FileName;                        using (FileStream fs = new FileStream(fileSavePath, FileMode.Create))                        {                            fs.Write(arrMsgRec, 1, length - 1);                            MsgShow("文件已经保存在:" + fileSavePath);                        }                    }                }            }        }         #endregion        void MsgShow(string str)        {            txtMsg.AppendText(str + "\r\n");        }        private void btnSend_Click(object sender, EventArgs e)        {               string strMsg=txtSend.Text.Trim();            byte[] arrMsg=System.Text.Encoding.UTF8.GetBytes(strMsg);            //====================================================================            //找到选中客户端，让字典中的key值与选中客户端的名字相同，则向他发送消息            string strClient = lbClientList.Text;            dtSocket[strClient].Send(arrMsg);            MsgShow(strMsg + "已发送！");        }        private void btnSendToAll_Click(object sender, EventArgs e)        {            string strMsg = txtSend.Text.Trim();            byte[] arrMsg = System.Text.Encoding.UTF8.GetBytes(strMsg);            foreach (Socket s in dtSocket.Values)            {                s.Send(arrMsg);            }            MsgShow("群发完毕~~");        }    }}

客户端代码：

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Net.Sockets;using System.Net;using System.Threading;using System.IO;namespace ChatClient{    public partial class FClient : Form    {        public FClient()        {            InitializeComponent();            //防止出现不运行的txtMsg线程操作            TextBox.CheckForIllegalCrossThreadCalls = false;        }        Socket socketClient;        private void BtnConntionServer_Click(object sender, EventArgs e)        {            socketClient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            IPAddress address = IPAddress.Parse(txtIP.Text.ToString());            IPEndPoint endpoint = new IPEndPoint(address, int.Parse(txtPort.Text.Trim()));            socketClient.Connect(endpoint);            Thread recThread = new Thread(RecMsg);            recThread.IsBackground = false;//防止在关闭程序后另外一个线程还在进行            recThread.Start();//出现一个实例，一定要让其start 说明是线程可以开始了即就绪了        }        void RecMsg()        {            while(true)            {                Byte[] arrMsgRec = new byte[1024 * 1024 * 2]; //用来储存接收服务端的二进制数据                //接收到文件的长度                int length=socketClient.Receive(arrMsgRec);                //把接收到的消息转化成string类型                string strMsgRec = System.Text.Encoding.UTF8.GetString(arrMsgRec, 0, length);                MsgShow(strMsgRec);            }        }        void MsgShow(string str)        {            txtMsg.AppendText(str + "\r\n");        }        private void btnSend_Click(object sender, EventArgs e)        {//先与主机建立链接，然后让主机产生一个负责通讯的套接字，最终由客户端send，服务端recieve就可以            //socketClient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            //IPAddress address = IPAddress.Parse(txtIP.Text.ToString());            //IPEndPoint endpoint = new IPEndPoint(address, int.Parse(txtPort.Text.Trim()));            //socketClient.Connect(endpoint);            string msg = this.txtC2S.Text.Trim();            byte[] arrMsg = System.Text.Encoding.UTF8.GetBytes(msg);            byte[] arrMsgSend = new byte[arrMsg.Length + 1];            arrMsgSend[0] = 0;            Buffer.BlockCopy(arrMsg, 0, arrMsgSend, 1, arrMsg.Length);            socketClient.Send(arrMsgSend);            MsgShow("已经将"+msg+"发送到服务端");        }        private void btnChoiceFile_Click(object sender, EventArgs e)        {            OpenFileDialog ofd = new OpenFileDialog();            if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK)            {                txtFilePath.Text = ofd.FileName;            }        }        private void btnSendFile_Click(object sender, EventArgs e)        {            using(FileStream fs=new FileStream(txtFilePath.Text,FileMode.Open))            {                byte[] arrFile = new byte[1024 * 1024 * 2];                int length = fs.Read(arrFile, 0, arrFile.Length);                byte[] arrFileSend = new byte[length + 1];                arrFileSend[0] = 1;                Buffer.BlockCopy(arrFile, 0,  arrFileSend,1, length );                socketClient.Send(arrFileSend);                MsgShow("传送成功！");            }        }    }}