C#完整聊天室服务器和客户端代码实例

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace 多人聊天程序Server端
{
///
/// 应用程序的主入口点。
///
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
// 启动服务按钮
private void button2_Click(object sender, System.EventArgs e)
{
try
{
// 必须填写端口
if(txtPort.Text == “”)
{
MessageBox.Show(“请先填写服务端口号!”, “提示”);
return;
}
Int32 port = Int32.Parse(txtPort.Text); // 获得端口号
// 创建侦听的Socket
mainSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPEndPoint localEP = new IPEndPoint(IPAddress.Any, port);
// 将 Socket 绑定到本地的终结点上
mainSocket.Bind(localEP);
// 开始侦听，最大的连接数是 5
mainSocket.Listen(5);
// 开始一个异步操作接受客户的连接请求
mainSocket.BeginAccept(new AsyncCallback(OnClientConnect), null);
// 启动服务按钮不可用，停止服务按钮可用
UpdateControls(true);
}
catch(SocketException se)
{
MessageBox.Show(se.Message, “提示”);
}
}
// 更新“启动服务按钮”和“停止服务”按钮的状态：是否可用；
// 注意：两个按钮的状态是互斥的
private void UpdateControls(bool onServe)
{
button2.Enabled = !onServe;
button3.Enabled = onServe;
if(onServe)
{
status.Text = “已启动服务”;
}
else
{
status.Text = “未启动服务”;
}
}
// 回调函数，当客户连接上时，将会被调用
public void OnClientConnect(IAsyncResult asyn)
{
try
{
// 调用EndAccept完成BeginAccept异步调用，返回一个新的Socket处理与客户的通信
Socket workerSocket = mainSocket.EndAccept(asyn);
// 增加客户数目
Interlocked.Increment(ref clientNum);
// 将 workerSocket Socket加入到 ArrayList 中
workerSocketList.Add(workerSocket);
// 发送欢迎信息给连接上服务器的客户
string msg = “欢迎客户 ” + clientNum + ” 登录服务器\n”;
SendWelcomeToClient(msg, clientNum);
// 在线客户数目改变，必须更新客户列表
UpdateClientListControl();
// 连接上的客户接收数据
WaitForData(workerSocket, clientNum);
// 主 Socket 返回，继续等待其它的连接请求
mainSocket.BeginAccept(new AsyncCallback(OnClientConnect), null);
}
catch(ObjectDisposedException)
{
System.Diagnostics.Debugger.Log(0,”1”,”\n OnClientConnection: Socket已经关闭!\n”);
}
catch(SocketException se)
{
MessageBox.Show(se.Message, “提示”);
}
}
// 发送欢迎信息给客户
void SendWelcomeToClient(string msg, int clientNumber)
{
// 用UTF8格式来将string信息转化成byte数组形式
byte[] byData = System.Text.Encoding.UTF8.GetBytes(msg);
// 获得客户clientNumber对应的Socket
Socket workerSocket = (Socket)workerSocketList[clientNumber - 1];
// 将数据发给客户
workerSocket.Send(byData);
}
// 该类保存当前的socket，它的客户号还有发送给服务器的数据
public class SocketPacket
{
public System.Net.Sockets.Socket currentSocket; // 当前的Socket
public int clientNumber; // 客户号
public byte[] dataBuffer = new byte[1024]; // 发给服务器的数据
// 构造函数
public SocketPacket(System.Net.Sockets.Socket socket, int clientNumber)
{
currentSocket = socket;
this.clientNumber = clientNumber;
}
}
// 开始等待客户发送数据
public void WaitForData(System.Net.Sockets.Socket socket, int clientNumber)
{
try
{
if(pfnWorkerCallBack == null)
{
// 当连接上的客户有写的操作的时候，调用回调函数
pfnWorkerCallBack = new AsyncCallback(OnDataReceived);
}
SocketPacket socketPacket = new SocketPacket(socket, clientNumber);
socket.BeginReceive(socketPacket.dataBuffer, 0, socketPacket.dataBuffer.Length,
SocketFlags.None, pfnWorkerCallBack, socketPacket);
}
catch(SocketException se)
{
MessageBox.Show (se.Message, “提示”);
}
}
// 当客户写数据时，调用以下方法
public void OnDataReceived(IAsyncResult asyn)
{
SocketPacket socketData = (SocketPacket)asyn.AsyncState ;
try
{
// EndReceive完成BeginReceive异步调用，返回客户写入流的字节数
int iRx = socketData.currentSocket.EndReceive(asyn);
// 加 1 是因为字符串以 ‘\0’ 作为结束标志符
char[] chars = new char[iRx + 1];
// 对客户发来的信息进行UTF8解码，存入chars字符数组中
System.Text.Decoder decoder = System.Text.Encoding.UTF8.GetDecoder();
int charLen = decoder.GetChars(socketData.dataBuffer, 0, iRx, chars, 0);
System.String szData = new System.String(chars);
string msg = “客户 ” + socketData.clientNumber + ” 发的信息:” + szData;
// 将客户发的数据加入到信息列表中
AppendToRichEditControl(msg);
// 等待数据
WaitForData(socketData.currentSocket, socketData.clientNumber);
}
catch (ObjectDisposedException )
{
System.Diagnostics.Debugger.Log(0,”1”,”\nOnDataReceived: Socket已经关闭!\n”);
}
catch(SocketException se)
{
if(se.ErrorCode == 10054)
{
// 将客户断开连接的信息写入信息列表中
string msg = “客户 ” + socketData.clientNumber + ” 已断开了连接!” + “\n”;
AppendToRichEditControl(msg);
// 移走已关闭的socket
workerSocketList[socketData.clientNumber - 1] = null;
// 更新客户列表
UpdateClientListControl();
}
else
{
MessageBox.Show (se.Message, “提示”);
}
}
}
// 更新信息列表，该方法可由主线程或其他工作线程所调用
private void AppendToRichEditControl(string msg)
{
// 测试看是哪个线程调用了该方法
if (InvokeRequired)
{
// We cannot update the GUI on this thread.
// All GUI controls are to be updated by the main (GUI) thread.
// Hence we will use the invoke method on the control which will
// be called when the Main thread is free
// Do UI update on UI thread
object[] pList = {msg};
txtRecvMsg.BeginInvoke(new UpdateRichEditCallback(OnUpdateRichEdit), pList);
}
else
{
// 创建该控件的主线程直接更新信息列表
OnUpdateRichEdit(msg);
}
}
// 添加信息到 txtRecvMsg 中
private void OnUpdateRichEdit(string msg)
{
// txtRecvMsg.AppendText(msg);
txtRecvMsg.Text = txtRecvMsg.Text + msg;
}
// 更新客户列表
private void UpdateClientListControl()
{
if (InvokeRequired) // Is this called from a thread other than the one created
// the control
{
clientList.BeginInvoke(new UpdateClientListCallback(UpdateClientList), null);
}
else
{
// 创建该控件的主线程直接更新信息列表
UpdateClientList();
}
}
// 更新客户列表
void UpdateClientList()
{
clientList.Items.Clear(); // 清空客户列表
for(int i = 0; i < workerSocketList.Count; i++)
{
// 加1，是因为数组从下标0开始，而我们的客户标号是从1开始
string clientKey = Convert.ToString(i + 1);
Socket workerSocket = (Socket)workerSocketList[i];
if(workerSocket != null)
{
// 将连接着服务器的客户添加到客户列表中
if(workerSocket.Connected)
{
clientList.Items.Add(clientKey);
}
}
}
}
// 停止服务按钮
private void button3_Click(object sender, System.EventArgs e)
{
CloseSockets();
UpdateControls(false);
// 更新客户列表
UpdateClientListControl();
}
// 发送信息按钮
private void button1_Click(object sender, System.EventArgs e)
{
// 如果在线客户列表不为空，则允许发送信息
if (clientList.Items.Count != 0 )
{
try
{
string msg = txtSendMsg.Text;
msg = “服务器信息: ” + msg + “\n”;
byte[] byData = System.Text.Encoding.UTF8.GetBytes(msg);
Socket workerSocket = null;
for(int i = 0; i < workerSocketList.Count; i++)
{
workerSocket = (Socket)workerSocketList[i];
if(workerSocket!= null)
{
// 发给所有连接上服务器的客户
if(workerSocket.Connected)
{
workerSocket.Send(byData);
}
}
}
}
catch(SocketException se)
{
MessageBox.Show(se.Message, “提示”);
}
}
else
{
MessageBox.Show(“没有在线客户,不能发送信息!”, “提示”);
}
}
// 清空信息按钮
private void button4_Click(object sender, System.EventArgs e)
{
txtRecvMsg.Clear(); // 清空从客户发来的信息
}
// 关闭窗体按钮
private void button5_Click(object sender, System.EventArgs e)
{
CloseSockets();
Close();
}
// 关闭Socket
void CloseSockets()
{
// 关闭主Socket
if(mainSocket != null)
{
mainSocket.Close();
}
Socket workerSocket = null;
// 关闭客户 Socket 数组
for(int i = 0; i < workerSocketList.Count; i++)
{
workerSocket = (Socket)workerSocketList[i];
if(workerSocket != null)
{
workerSocket.Close();
workerSocket = null;
}
}
}
private void Form1_Load(object sender, System.EventArgs e)
{
try
{
// 获得本机的IP地址
txtIP.Text = Dns.Resolve(Dns.GetHostName()).AddressList[0].ToString();
// 启动时，启动服务按钮可用，停止服务按钮不可用
UpdateControls(false);
}
catch(Exception exc)
{
MessageBox.Show(exc.Message, “提示”);
}
}
}
}
客户端主要实现接收来自服务端返回的消息、实现发送消息的操作界面，创建Socket实例，得到服务器的IP地址，更新控件，连接和断开等，具体代码如下：

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Net;
using System.Net.Sockets;
namespace 多人聊天程序Client端
{
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Label label1;
private System.Windows.Forms.TextBox txtIP;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.RichTextBox txtSendMsg;
private System.Windows.Forms.Label label4;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.Button button3;
private System.Windows.Forms.Button button4;
private System.Windows.Forms.RichTextBox txtRecvMsg;
private System.Windows.Forms.TextBox txtPort;
private System.Windows.Forms.Button button5;
private System.ComponentModel.Container components = null;
byte[] m_dataBuffer = new byte[10];
IAsyncResult result;
public AsyncCallback pfnCallBack ;
private System.Windows.Forms.Label status;
private System.Windows.Forms.Label label5;
public Socket clientSocket;
public Form1()
{
InitializeComponent();
}
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.txtIP = new System.Windows.Forms.TextBox();
this.label2 = new System.Windows.Forms.Label();
this.txtPort = new System.Windows.Forms.TextBox();
this.label3 = new System.Windows.Forms.Label();
this.txtSendMsg = new System.Windows.Forms.RichTextBox();
this.label4 = new System.Windows.Forms.Label();
this.status = new System.Windows.Forms.Label();
this.txtRecvMsg = new System.Windows.Forms.RichTextBox();
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.button3 = new System.Windows.Forms.Button();
this.button4 = new System.Windows.Forms.Button();
this.label5 = new System.Windows.Forms.Label();
this.button5 = new System.Windows.Forms.Button();
this.SuspendLayout();
// label1
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(16, 24);
this.label1.Name = “label1”;
this.label1.Size = new System.Drawing.Size(60, 17);
this.label1.TabIndex = 0;
this.label1.Text = “服务器IP:”;
// txtIP
this.txtIP.Location = new System.Drawing.Point(80, 24);
this.txtIP.Name = “txtIP”;
this.txtIP.Size = new System.Drawing.Size(160, 21);
this.txtIP.TabIndex = 1;
this.txtIP.Text = “”;
// label2
this.label2.AutoSize = true;
this.label2.Location = new System.Drawing.Point(16, 56);
this.label2.Name = “label2”;
this.label2.Size = new System.Drawing.Size(35, 17);
this.label2.TabIndex = 2;
this.label2.Text = “端口:”;
// txtPort
this.txtPort.Location = new System.Drawing.Point(80, 56);
this.txtPort.Name = “txtPort”;
this.txtPort.Size = new System.Drawing.Size(40, 21);
this.txtPort.TabIndex = 3;
this.txtPort.Text = “”;
// label3
this.label3.AutoSize = true;
this.label3.Location = new System.Drawing.Point(16, 96);
this.label3.Name = “label3”;
this.label3.Size = new System.Drawing.Size(110, 17);
this.label3.TabIndex = 4;
this.label3.Text = “发送信息给服务器:”;
// txtSendMsg
this.txtSendMsg.Location = new System.Drawing.Point(16, 120);
this.txtSendMsg.Name = “txtSendMsg”;
this.txtSendMsg.Size = new System.Drawing.Size(224, 88);
this.txtSendMsg.TabIndex = 5;
this.txtSendMsg.Text = “”;
// label4
this.label4.AutoSize = true;
this.label4.Location = new System.Drawing.Point(16, 248);
this.label4.Name = “label4”;
this.label4.Size = new System.Drawing.Size(60, 17);
this.label4.TabIndex = 6;
this.label4.Text = “连接状态:”;
// status
this.status.Location = new System.Drawing.Point(80, 248);
this.status.Name = “status”;
this.status.Size = new System.Drawing.Size(192, 23);
this.status.TabIndex = 7;
// txtRecvMsg
this.txtRecvMsg.Location = new System.Drawing.Point(264, 80);
this.txtRecvMsg.Name = “txtRecvMsg”;
this.txtRecvMsg.ReadOnly = true;
this.txtRecvMsg.Size = new System.Drawing.Size(224, 144);
this.txtRecvMsg.TabIndex = 8;
this.txtRecvMsg.Text = “”;
// button1
this.button1.Location = new System.Drawing.Point(280, 16);
this.button1.Name = “button1”;
this.button1.Size = new System.Drawing.Size(88, 32);
this.button1.TabIndex = 9;
this.button1.Text = “连接”;
this.button1.Click += new System.EventHandler(this.button1_Click);
// button2
this.button2.Location = new System.Drawing.Point(384, 16);
this.button2.Name = “button2”;
this.button2.Size = new System.Drawing.Size(88, 32);
this.button2.TabIndex = 10;
this.button2.Text = “断开”;
this.button2.Click += new System.EventHandler(this.button2_Click);
// button3
this.button3.Location = new System.Drawing.Point(280, 232);
this.button3.Name = “button3”;
this.button3.Size = new System.Drawing.Size(88, 32);
this.button3.TabIndex = 11;
this.button3.Text = “清空信息”;
this.button3.Click += new System.EventHandler(this.button3_Click);
// button4
this.button4.Location = new System.Drawing.Point(384, 232);
this.button4.Name = “button4”;
this.button4.Size = new System.Drawing.Size(88, 32);
this.button4.TabIndex = 12;
this.button4.Text = “关闭”;
this.button4.Click += new System.EventHandler(this.button4_Click);
// label5
this.label5.AutoSize = true;
this.label5.Location = new System.Drawing.Point(264, 64);
this.label5.Name = “label5”;
this.label5.Size = new System.Drawing.Size(134, 17);
this.label5.TabIndex = 13;
this.label5.Text = “收到服务器发来的信息:”;
// button5
this.button5.Location = new System.Drawing.Point(16, 208);
this.button5.Name = “button5”;
this.button5.Size = new System.Drawing.Size(224, 32);
this.button5.TabIndex = 14;
this.button5.Text = “发送信息”;
this.button5.Click += new System.EventHandler(this.button5_Click);
// Form1
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(512, 277);
this.Controls.Add(this.button5);
this.Controls.Add(this.label5);
this.Controls.Add(this.button4);
this.Controls.Add(this.button3);
this.Controls.Add(this.button2);
this.Controls.Add(this.button1);
this.Controls.Add(this.txtRecvMsg);
this.Controls.Add(this.status);
this.Controls.Add(this.label4);
this.Controls.Add(this.txtSendMsg);
this.Controls.Add(this.label3);
this.Controls.Add(this.txtPort);
this.Controls.Add(this.label2);
this.Controls.Add(this.txtIP);
this.Controls.Add(this.label1);
this.Name = “Form1”;
this.Text = “多人聊天程序Client端”;
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);
}
#endregion
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
// 连接按钮
private void button1_Click(object sender, System.EventArgs e)
{
// IP地址和端口号不能为空
if(txtIP.Text == “” || txtPort.Text == “”)
{
MessageBox.Show(“请先完整填写服务器IP地址和端口号!”, “提示”);
return;
}
try
{
// 创建Socket实例
clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
// 得到服务器的IP地址
IPAddress ipAddress = IPAddress.Parse(txtIP.Text);
Int32 port = Int32.Parse(txtPort.Text);
// 创建远程终结点
IPEndPoint remoteEP = new IPEndPoint(ipAddress, port);
// 连接到远程服务器
clientSocket.Connect(remoteEP);
if(clientSocket.Connected)
{
UpdateControls(true);
WaitForData(); // 异步等待数据
}
}
catch(SocketException se)
{
MessageBox.Show (se.Message, “提示”);
UpdateControls(false);
}
}
// 等待数据
public void WaitForData()
{
try
{
if(pfnCallBack == null)
{
// 当连接上的客户有写的操作的时候，调用回调函数
pfnCallBack = new AsyncCallback(OnDataReceived);
}
SocketPacket socketPacket = new SocketPacket();
socketPacket.thisSocket = clientSocket;
result = clientSocket.BeginReceive(socketPacket.dataBuffer, 0, socketPacket.dataBuffer.Length,
SocketFlags.None, pfnCallBack, socketPacket);
}
catch(SocketException se)
{
MessageBox.Show(se.Message, “提示”);
}
}
// 该类保存Socket以及发送给服务器的数据
public class SocketPacket
{
public System.Net.Sockets.Socket thisSocket;
public byte[] dataBuffer = new byte[1024]; // 发给服务器的数据
}
// 接收数据
public void OnDataReceived(IAsyncResult asyn)
{
try
{
SocketPacket theSockId = (SocketPacket)asyn.AsyncState ;
// EndReceive完成BeginReceive异步调用，返回服务器写入流的字节数
int iRx = theSockId.thisSocket.EndReceive(asyn);
// 加 1 是因为字符串以 ‘\0’ 作为结束标志符
char[] chars = new char[iRx + 1];
// 用UTF8格式来将string信息转化成byte数组形式
System.Text.Decoder decoder = System.Text.Encoding.UTF8.GetDecoder();
int charLen = decoder.GetChars(theSockId.dataBuffer, 0, iRx, chars, 0);
System.String szData = new System.String(chars);
// 将收到的信息显示在信息列表中
txtRecvMsg.Text = txtRecvMsg.Text + szData;
// 等待数据
WaitForData();
}
catch (ObjectDisposedException)
{
System.Diagnostics.Debugger.Log(0,”1”,”\nOnDataReceived: Socket已经关闭!\n”);
}
catch(SocketException se)
{
if(se.ErrorCode == 10054)
{
string msg = “服务器” + “停止服务!” + “\n”;
txtRecvMsg.Text = txtRecvMsg.Text + msg;
clientSocket.Close();
clientSocket = null;
UpdateControls(false);
}
else
{
MessageBox.Show(se.Message, “提示”);
}
}
}
// 更新控件。连接和断开（发送信息）按钮的状态是互斥的
private void UpdateControls(bool connected)
{
button1.Enabled = !connected;
button2.Enabled = connected;
button5.Enabled = connected;
if(connected)
{
status.Text = “已连接”;
}
else
{
status.Text = “无连接”;
}
}
// 断开按钮
private void button2_Click(object sender, System.EventArgs e)
{
// 关闭Socket
if(clientSocket != null)
{
clientSocket.Close();
clientSocket = null;
UpdateControls(false);
}
}
// 发送信息按钮
private void button5_Click(object sender, System.EventArgs e)
{
try
{
// 如果客户与服务器有连接，则允许发送信息
if(clientSocket.Connected)
{
string msg = txtSendMsg.Text + “\n”;
// 用UTF8格式来将string信息转化成byte数组形式
byte[] byData = System.Text.Encoding.UTF8.GetBytes(msg);
if(clientSocket != null)
{
// 发送数据
clientSocket.Send(byData);
}
}
}
catch(Exception se)
{
MessageBox.Show(se.Message, “提示”);
}
}
// 清空按钮
private void button3_Click(object sender, System.EventArgs e)
{
txtRecvMsg.Clear(); // 清空信息列表
}
// 关闭按钮
private void button4_Click(object sender, System.EventArgs e)
{
// 关闭Socket
if(clientSocket != null)
{
clientSocket.Close();
clientSocket = null;
}
Close(); // 关闭窗体
}
private void Form1_Load(object sender, System.EventArgs e)
{
UpdateControls(false); // 初始化时，只有连接按钮可用
}
}
}