简单的多人聊天(C#.Socket).

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

using System.Threading;
using System.Net.Sockets;
using System.Net;
namespace Chat_Server
{
 /// <summary>
 /// Form1 的摘要说明。
 /// </summary>
 public class Form1 : System.Windows.Forms.Form
 {
  /// <summary>
  /// 必需的设计器变量。
  /// </summary>
  private System.ComponentModel.Container components = null;

static int listenport=6666;
  Socket clientsocket;
  private System.Windows.Forms.ListBox lbClients;
  ArrayList clients;
  private System.Windows.Forms.Button button1;
  Thread clientservice;
  private System.Windows.Forms.Label label1;
  Thread threadListen;

public Form1()
  {

InitializeComponent();

}

/// <summary>
  /// 清理所有正在使用的资源。
  /// </summary>
  protected override void Dispose( bool disposing )
  {
if( disposing )
{
 
 if(clientservice != null)
 {
  clientservice.Abort();
 }
 if(threadListen != null)
 {
  try
  {
threadListen.Abort();
  }
  catch(Exception ex)
  {
threadListen = null;
  }
 } 

if (components != null)
 {
  components.Dispose();
 }
}
base.Dispose( disposing );

  }

#region Windows 窗体设计器生成的代码
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
this.lbClients = new System.Windows.Forms.ListBox();
this.button1 = new System.Windows.Forms.Button();
this.label1 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// lbClients
//
this.lbClients.ItemHeight = 12;
this.lbClients.Location = new System.Drawing.Point(16, 24);
this.lbClients.Name = "lbClients";
this.lbClients.Size = new System.Drawing.Size(184, 268);
this.lbClients.TabIndex = 0;
//
// button1
//
this.button1.Location = new System.Drawing.Point(272, 56);
this.button1.Name = "button1";
this.button1.TabIndex = 1;
this.button1.Text = "button1";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// label1
//
this.label1.Location = new System.Drawing.Point(240, 136);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(120, 32);
this.label1.TabIndex = 2;
this.label1.Text = "label1";
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(368, 309);
this.Controls.Add(this.label1);
this.Controls.Add(this.button1);
this.Controls.Add(this.lbClients);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);

}
  #endregion

/// <summary>
  /// 应用程序的主入口点。
  /// </summary>
  [STAThread]
  static void Main()
  {
Application.Run(new Form1());
  }

private void StartListening()
  {
　TcpListener listener = new TcpListener(listenport);
　listener.Start();
label1.Text = "listening....";
while (true)
{
 try
 {
 
  Socket s = listener.AcceptSocket();
  clientsocket = s;
  clientservice = new Thread(new ThreadStart(ServiceClient));
  clientservice.Start();
 }
 catch(Exception ex)
 {
  MessageBox.Show("listening Error: "+ex.Message);
 }
}
  }
  private void ServiceClient()
  {
Socket client = clientsocket;
bool keepalive = true;

while (keepalive)
{
 Byte[] buffer = new Byte[1024];
 int bufLen = 0;
 try
 {
  bufLen = client.Available ;
  
  client.Receive(buffer,0,bufLen,SocketFlags.None);
  if(bufLen==0)
continue; 
 }
 catch(Exception ex)
 {
  MessageBox.Show("Receive Error:"+ex.Message);
  return;
 }
 
 string clientcommand = System.Text.Encoding.ASCII.GetString(buffer).Substring(0,bufLen);

string[] tokens = clientcommand.Split(new Char[]{'|'});
 Console.WriteLine(clientcommand);

if (tokens[0] == "CONN")
 {
  for(int n=0; n<clients.Count;n++)
  {
Client cl = (Client)clients[n];
SendToClient(cl, "JOIN|" + tokens[1]);
  }
  EndPoint ep = client.RemoteEndPoint;
  Client c = new Client(tokens[1], ep, clientservice, client);
  
  string message = "LIST|" + GetChatterList() +"\r\n";
  SendToClient(c, message);

clients.Add(c);

lbClients.Items.Add(c);

}
 if (tokens[0] == "CHAT")
 {
  for(int n=0; n<clients.Count;n++)
  {
Client cl = (Client)clients[n];
SendToClient(cl, clientcommand);
  }
 }
 if (tokens[0] == "PRIV")
 {
  string destclient = tokens[3];
  for(int n=0; n<clients.Count;n++)
  {
Client cl = (Client)clients[n];
if(cl.Name.CompareTo(tokens[3]) == 0)
 SendToClient(cl, clientcommand);
if(cl.Name.CompareTo(tokens[1]) == 0)
 SendToClient(cl, clientcommand);
  }
 }
 if (tokens[0] == "GONE")
 {
  int remove = 0;
  bool found = false;
  int c = clients.Count;
  for(int n=0; n<clients.Count;n++)
  {
Client cl = (Client)clients[n];
SendToClient(cl, clientcommand);
if(cl.Name.CompareTo(tokens[1]) == 0)
{
 remove = n;
 found = true;
 lbClients.Items.Remove(cl);
}
  }
  if(found)
clients.RemoveAt(remove);
  client.Close();
  keepalive = false;
 }
}
  }

private string GetChatterList()
  {
string result = "";

for(int i=0;i<clients.Count;i++)
{
 result += ((Client)clients[i]).Name+"|";
}
return result;

}

private void SendToClient(Client cl,string clientCommand)
  {
Byte[] message = System.Text.Encoding.ASCII.GetBytes(clientCommand);
Socket s = cl.Sock;
if(s.Connected)
{
 s.Send(message,message.Length,0);
}
  }

private void Form1_Load(object sender, System.EventArgs e)
  {
clients = new ArrayList();
  }

private void button1_Click(object sender, System.EventArgs e)
  {
threadListen = new Thread(new ThreadStart(StartListening));
threadListen.Start();  
  }
 }
}

/***************************** client类 ********************/

/************************** 放于 chatServer 项目中 *********/

using System;
using System.Threading;

namespace Chat_Server
{
 using System.Net.Sockets;
 using System.Net;

///
 /// Client 的摘要说明。
 ///
 public class Client
 {
  private Thread clthread;
  private EndPoint endpoint;
  private string name;
  private Socket sock;

public Client(string _name, EndPoint _endpoint, Thread _thread, Socket _sock)
  {
// TODO: 在此处添加构造函数逻辑
clthread = _thread;
endpoint = _endpoint;
name = _name;
sock = _sock;
  }

public override string ToString()
  {
return endpoint.ToString()+ " : " + name;
  }

public Thread CLThread
  {
get{return clthread;}
set{clthread = value;}
  }

public EndPoint Host
  {
get{return endpoint;}
set{endpoint = value;}
  }

public string Name
  {
get{return name;}
set{name = value;}
  }

public Socket Sock
  {
get{return sock;}
set{sock = value;}
  }
 }
}

/***************************** chatClient ************************************/

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading;

namespace Chat_Client
{
 /// <summary>
 /// Form1 的摘要说明。
 /// </summary>
 public class Form1 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.CheckBox checkBox1;
  private System.Windows.Forms.StatusBar statusBar1;

NetworkStream ns;
  StreamReader sr;
  TcpClient clientsocket;
  bool connected;
  Thread receive;
  string serveraddress = "219.228.231.85";
  int serverport = 6666;

private System.Windows.Forms.RichTextBox rtbChatIn;
  private System.Windows.Forms.ListBox lbChatters;
  private System.Windows.Forms.TextBox ChatOut;
  private System.Windows.Forms.Button btnDisconnect;
  private System.Windows.Forms.Button btnSend;
  private System.Windows.Forms.TextBox clientName;

string clientname;
  private System.Windows.Forms.Button btnConnect;

private System.ComponentModel.Container components = null;

public Form1()
  {

InitializeComponent();

}

/// <summary>
  /// 清理所有正在使用的资源。
  /// </summary>
  protected override void Dispose( bool disposing )
  {
if( disposing )
{
 if(receive != null)
 {
  QuitChat();
 }
 if (components != null)
 {
  components.Dispose();
 }
}
base.Dispose( disposing );
  }

#region Windows 窗体设计器生成的代码
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
this.lbChatters = new System.Windows.Forms.ListBox();
this.rtbChatIn = new System.Windows.Forms.RichTextBox();
this.checkBox1 = new System.Windows.Forms.CheckBox();
this.ChatOut = new System.Windows.Forms.TextBox();
this.btnSend = new System.Windows.Forms.Button();
this.statusBar1 = new System.Windows.Forms.StatusBar();
this.btnDisconnect = new System.Windows.Forms.Button();
this.clientName = new System.Windows.Forms.TextBox();
this.btnConnect = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// lbChatters
//
this.lbChatters.ItemHeight = 12;
this.lbChatters.Location = new System.Drawing.Point(32, 40);
this.lbChatters.Name = "lbChatters";
this.lbChatters.Size = new System.Drawing.Size(112, 172);
this.lbChatters.TabIndex = 0;
//
// rtbChatIn
//
this.rtbChatIn.Location = new System.Drawing.Point(160, 40);
this.rtbChatIn.Name = "rtbChatIn";
this.rtbChatIn.Size = new System.Drawing.Size(208, 176);
this.rtbChatIn.TabIndex = 2;
this.rtbChatIn.Text = "";
//
// checkBox1
//
this.checkBox1.Location = new System.Drawing.Point(16, 248);
this.checkBox1.Name = "checkBox1";
this.checkBox1.TabIndex = 3;
this.checkBox1.Text = "checkBox1";
//
// ChatOut
//
this.ChatOut.Location = new System.Drawing.Point(136, 248);
this.ChatOut.Name = "ChatOut";
this.ChatOut.Size = new System.Drawing.Size(136, 21);
this.ChatOut.TabIndex = 4;
this.ChatOut.Text = "message";
//
// btnSend
//
this.btnSend.Location = new System.Drawing.Point(336, 248);
this.btnSend.Name = "btnSend";
this.btnSend.TabIndex = 5;
this.btnSend.Text = "send";
this.btnSend.Click += new System.EventHandler(this.btnSend_Click);
//
// statusBar1
//
this.statusBar1.Location = new System.Drawing.Point(0, 287);
this.statusBar1.Name = "statusBar1";
this.statusBar1.Size = new System.Drawing.Size(464, 22);
this.statusBar1.TabIndex = 6;
this.statusBar1.Text = "statusBar1";
//
// btnDisconnect
//
this.btnDisconnect.Enabled = false;
this.btnDisconnect.Location = new System.Drawing.Point(392, 112);
this.btnDisconnect.Name = "btnDisconnect";
this.btnDisconnect.Size = new System.Drawing.Size(64, 32);
this.btnDisconnect.TabIndex = 7;
this.btnDisconnect.Text = "断开";
this.btnDisconnect.Click += new System.EventHandler(this.btnDisconnect_Click);
//
// clientName
//
this.clientName.Location = new System.Drawing.Point(96, 8);
this.clientName.Name = "clientName";
this.clientName.TabIndex = 8;
this.clientName.Text = "name";
//
// btnConnect
//
this.btnConnect.Location = new System.Drawing.Point(392, 56);
this.btnConnect.Name = "btnConnect";
this.btnConnect.Size = new System.Drawing.Size(64, 32);
this.btnConnect.TabIndex = 9;
this.btnConnect.Text = "连接";
this.btnConnect.Click += new System.EventHandler(this.btnConnect_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(464, 309);
this.Controls.Add(this.btnConnect);
this.Controls.Add(this.clientName);
this.Controls.Add(this.btnDisconnect);
this.Controls.Add(this.statusBar1);
this.Controls.Add(this.btnSend);
this.Controls.Add(this.ChatOut);
this.Controls.Add(this.checkBox1);
this.Controls.Add(this.rtbChatIn);
this.Controls.Add(this.lbChatters);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);

}
  #endregion

/// <summary>
  /// 应用程序的主入口点。
  /// </summary>
  [STAThread]
  static void Main()
  {
Application.Run(new Form1());
  }

private void EstablishConnection()
  {
statusBar1.Text = "正在连接到服务器";

try
{
 clientsocket = new TcpClient(serveraddress,serverport);
 ns = clientsocket.GetStream();
 sr = new StreamReader(ns);
 connected = true;

}
catch (Exception)
{
 MessageBox.Show("不能连接到服务器！","错误",
  MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
 statusBar1.Text = "已断开连接";
}
  }

private void RegisterWithServer()
  {
lbChatters.Items.Clear();

clientname = clientName.Text;
try
{
 string command = "CONN|" + clientname; //+"\r\n";
 Byte[] outbytes = System.Text.Encoding.ASCII.GetBytes(command.ToCharArray());
 ns.Write(outbytes,0,outbytes.Length);

string serverresponse = sr.ReadLine();
 serverresponse.Trim();
 string[] tokens = serverresponse.Split('|');
 if(tokens[0] == "LIST")
 {
  statusBar1.Text = "已连接";
  btnDisconnect.Enabled = true;
 }
 if(tokens[1] != "")
 {
  for(int n=1; n<tokens.Length;n++)
lbChatters.Items.Add(tokens[n].Trim(new char[]{'\r','\n'}));
 }
 this.Text = clientname + "：已连接到服务器";

}
catch (Exception ex)
{
 MessageBox.Show("注册时发生错误！"+ex.Message,"错误",
  MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
 connected = false;
}
  }

private void ReceiveChat()
  {
bool keepalive = true;
while (keepalive)
{
 try
 {
  Byte[] buffer = new Byte[1024];  // 2048???
  ns.Read(buffer,0,buffer.Length);
  string chatter = System.Text.Encoding.ASCII.GetString(buffer);
  string[] tokens = chatter.Split(new Char[]{'|'});

if (tokens[0] == "CHAT")
  {
rtbChatIn.AppendText(tokens[1]);
//if(logging)
// logwriter.WriteLine(tokens[1]);
  }
  if (tokens[0] == "PRIV")
  {
rtbChatIn.AppendText("Private from ");
rtbChatIn.AppendText(tokens[1].Trim() );
rtbChatIn.AppendText(tokens[2] + "\r\n");
//if(logging)
//{
// logwriter.Write("Private from ");
// logwriter.Write(tokens[1].Trim() );
// logwriter.WriteLine(tokens[2] + "\r\n");
//}
  }
  if (tokens[0] == "JOIN")
  {
rtbChatIn.AppendText(tokens[1].Trim() );
rtbChatIn.AppendText(" has joined the Chat\r\n");
//if(logging)
//{
// logwriter.WriteLine(tokens[1]+" has joined the Chat");
//}
string newguy = tokens[1].Trim(new char[]{'\r','\n'});
lbChatters.Items.Add(newguy);
  }
  if (tokens[0] == "GONE")
  {
rtbChatIn.AppendText(tokens[1].Trim() );
rtbChatIn.AppendText(" has left the Chat\r\n");
//if(logging)
//{
// logwriter.WriteLine(tokens[1]+" has left the Chat");
//}
lbChatters.Items.Remove(tokens[1].Trim(new char[]{'\r','\n'}));
  }
  if (tokens[0] == "QUIT")
  {
ns.Close();
clientsocket.Close();
keepalive = false;
statusBar1.Text = "服务器端已停止";
connected= false;
btnSend.Enabled = false;
btnDisconnect.Enabled = false;
  }
 }
 catch(Exception){}
}
  }

private void QuitChat()
  {
if(connected)
{
 try
 {
  string command = "GONE|" + clientname;
  Byte[] outbytes = System.Text.Encoding.ASCII.GetBytes(command.ToCharArray());
  ns.Write(outbytes,0,outbytes.Length);
  clientsocket.Close();
 }
 catch(Exception ex)
 {
  MessageBox.Show(ex.Message);
 }
}
//if(logging)
// logwriter.Close();
if(receive != null && receive.IsAlive)
 receive.Abort();
this.Text = "客户端";

connected = false;

}

private void btnSend_Click(object sender, System.EventArgs e)
  {
if(connected)
{
 try
 {
  string command = "CHAT|" + clientname+": "+ChatOut.Text+"\r\n";
  Byte[] outbytes = System.Text.Encoding.ASCII.GetBytes(command.ToCharArray());
  ns.Write(outbytes,0,outbytes.Length);
  //clientsocket.Close();
 }
 catch(Exception ex)
 {
  MessageBox.Show(ex.Message);
 }
}
  }

private void btnConnect_Click(object sender, System.EventArgs e)
  {
EstablishConnection();
RegisterWithServer();
if(connected)
{
 receive = new Thread(new ThreadStart(ReceiveChat));
 receive.Start();
}
  }

private void btnDisconnect_Click(object sender, System.EventArgs e)
  {
QuitChat();
  }
 }
}