C# winform实现一个服务端和多个客户端进行通信
参看此链接http://www.cnblogs.com/longwu/archive/2011/08/25/2153636.html
在上述代码的基础上进行了修改，包括一些捕获异常以及按钮的应用，扩充了一个listbox确保服务端可以选择和不同的客户端进行通信
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.Threading; using System.Net.Sockets; using System.Net; using System.Collections; namespace chat1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); StartPosition = FormStartPosition.CenterScreen; //关闭对文本框的非线程操作检查 TextBox.CheckForIllegalCrossThreadCalls = false; } string RemoteEndPoint; //客户端的网络结点 Thread threadwatch = null;//负责监听客户端的线程 Socket socketwatch = null;//负责监听客户端的套接字 //创建一个和客户端通信的套接字 Dictionary<string, Socket> dic = new Dictionary<string, Socket> { }; //定义一个集合，存储客户端信息 private void button1_Click(object sender, EventArgs e) { this.button1.Enabled = false; //定义一个套接字用于监听客户端发来的消息，包含三个参数（IP4寻址协议，流式连接，Tcp协议） socketwatch = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp); //服务端发送信息需要一个IP地址和端口号 IPAddress address = IPAddress.Parse(textBox1.Text.Trim());//获取文本框输入的IP地址 //将IP地址和端口号绑定到网络节点point上 IPEndPoint point = new IPEndPoint(address,int.Parse(textBox2.Text.Trim()));//获取文本框上输入的端口号 //此端口专门用来监听的 //监听绑定的网络节点 socketwatch.Bind(point); //将套接字的监听队列长度限制为20 socketwatch.Listen(20); //创建一个监听线程 threadwatch = new Thread(watchconnecting); //将窗体线程设置为与后台同步，随着主线程结束而结束 threadwatch.IsBackground = true; //启动线程 threadwatch.Start(); //启动线程后 textBox3文本框显示相应提示 textBox3.AppendText("开始监听客户端传来的信息!" + "\r\n"); } void OnlineList_Disp(string Info) { listBoxOnlineList.Items.Add(Info); //在线列表中显示连接的客户端套接字 } //监听客户端发来的请求 private void watchconnecting() { Socket connection = null; while (true) //持续不断监听客户端发来的请求 { try { connection = socketwatch.Accept(); } catch (Exception ex) { textBox3.AppendText(ex.Message); //提示套接字监听异常 break; } //获取客户端的IP和端口号 IPAddress clientIP = (connection.RemoteEndPoint as IPEndPoint).Address; int clientPort = (connection.RemoteEndPoint as IPEndPoint).Port; //让客户显示"连接成功的"的信息 string sendmsg = "连接服务端成功！\r\n" + "本地IP:" + clientIP + "，本地端口" + clientPort.ToString(); byte[] arrSendMsg = Encoding.UTF8.GetBytes(sendmsg); connection.Send(arrSendMsg); RemoteEndPoint = connection.RemoteEndPoint.ToString(); //客户端网络结点号 textBox3.AppendText("成功与" + RemoteEndPoint + "客户端建立连接！\t\n"); //显示与客户端连接情况 dic.Add(RemoteEndPoint, connection); //添加客户端信息 OnlineList_Disp(RemoteEndPoint); //显示在线客户端 //IPEndPoint netpoint = new IPEndPoint(clientIP,clientPort); IPEndPoint netpoint = connection.RemoteEndPoint as IPEndPoint; //创建一个通信线程 ParameterizedThreadStart pts = new ParameterizedThreadStart(recv); Thread thread = new Thread(pts); thread.IsBackground = true;//设置为后台线程，随着主线程退出而退出 //启动线程 thread.Start(connection); } } /// /// 接收客户端发来的信息 /// ///客户端套接字对象 private void recv(object socketclientpara) { Socket socketServer = socketclientpara as Socket; while (true) { //创建一个内存缓冲区 其大小为1024*1024字节 即1M byte[] arrServerRecMsg = new byte[1024 * 1024]; //将接收到的信息存入到内存缓冲区,并返回其字节数组的长度 try { int length = socketServer.Receive(arrServerRecMsg); //将机器接受到的字节数组转换为人可以读懂的字符串 string strSRecMsg = Encoding.UTF8.GetString(arrServerRecMsg, 0, length); //将发送的字符串信息附加到文本框txtMsg上 textBox3.AppendText("客户端:" + socketServer.RemoteEndPoint+",time:" + GetCurrentTime() + "\r\n" + strSRecMsg + "\r\n\n"); } catch (Exception ex) { textBox3.AppendText("客户端"+socketServer.RemoteEndPoint+"已经中断连接"+"\r\n"); //提示套接字监听异常 listBoxOnlineList.Items.Remove(socketServer.RemoteEndPoint.ToString());//从listbox中移除断开连接的客户端 socketServer.Close();//关闭之前accept出来的和客户端进行通信的套接字 break; } } } /// /// 获取当前系统时间的方法 /// /// 当前时间 private DateTime GetCurrentTime() { DateTime currentTime = new DateTime(); currentTime = DateTime.Now; return currentTime; } //发送信息到客户端 private void button2_Click(object sender, EventArgs e) { string sendMsg = textBox4.Text.Trim(); //要发送的信息 byte[] bytes = System.Text.Encoding.UTF8.GetBytes(sendMsg); //将要发送的信息转化为字节数组，因为Socket发送数据时是以字节的形式发送的 if (listBoxOnlineList.SelectedIndex == -1) { MessageBox.Show("请选择要发送的客户端！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Stop); } else { string selectClient = listBoxOnlineList.Text; //选择要发送的客户端 dic[selectClient].Send(bytes); //发送数据 textBox4.Clear(); textBox3.AppendText(label4.Text + GetCurrentTime() + "\r\n" + sendMsg + "\r\n"); } } //快捷键 Enter 发送信息 private void textBox4_KeyDown(object sender, KeyEventArgs e) { //如果用户按下了Enter键 if (e.KeyCode == Keys.Enter) { string sendMsg = textBox4.Text.Trim(); //要发送的信息 byte[] bytes = System.Text.Encoding.UTF8.GetBytes(sendMsg); if (listBoxOnlineList.SelectedIndex == -1) { MessageBox.Show("请选择要发送的客户端！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Stop); } else { string selectClient = listBoxOnlineList.Text; //选择要发送的客户端 dic[selectClient].Send(bytes); //发送数据 textBox4.Clear(); textBox3.AppendText(label4.Text + GetCurrentTime() + "\r\n" + sendMsg + "\r\n"); } } } private void Form1_Load(object sender, EventArgs e) { } private void Form1_FormClosing(object sender, FormClosingEventArgs e) { DialogResult result = MessageBox.Show("是否退出？选否,最小化到托盘", "操作提示", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question); if (result == DialogResult.Yes) { this.Dispose(); } else if (result == DialogResult.Cancel) { e.Cancel = true; } else { e.Cancel = true; this.WindowState = FormWindowState.Minimized; this.Visible = false; this.notifyIcon1.Visible = true; this.ShowInTaskbar = false; } } private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e) { base.Visible = true; this.notifyIcon1.Visible = false; this.ShowInTaskbar = true; //base.Show(); base.WindowState = FormWindowState.Normal; } } }
以下是客户端的代码：
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.Threading; using System.Net.Sockets; using System.Net; namespace chat2 { public partial class Form1 : Form { public Form1() { InitializeComponent(); StartPosition = FormStartPosition.CenterScreen; //关闭对文本框的非法线程操作检查 TextBox.CheckForIllegalCrossThreadCalls = false; } //创建 1个客户端套接字 和1个负责监听服务端请求的线程 Thread threadclient = null; Socket socketclient = null; List<IPEndPoint> mlist =new List<IPEndPoint>(); private void button1_Click(object sender, EventArgs e) { //SocketException exception; this.button1.Enabled = false; //定义一个套接字监听 socketclient = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp); //获取文本框中的IP地址 IPAddress address = IPAddress.Parse(textBox1.Text.Trim()); //将获取的IP地址和端口号绑定在网络节点上 IPEndPoint point = new IPEndPoint(address,int.Parse(textBox2.Text.Trim())); try { //客户端套接字连接到网络节点上，用的是Connect socketclient.Connect(point); } catch (Exception ) { //MessageBox. MessageBox.Show("连接失败\r\n"); this.button1.Enabled = true; return; } threadclient=new Thread(recv); threadclient.IsBackground=true; threadclient.Start(); } // 接收服务端发来信息的方法 private void recv()// { int x = 0; while (true)//持续监听服务端发来的消息 { try { //定义一个1M的内存缓冲区，用于临时性存储接收到的消息 byte[] arrRecvmsg = new byte[1024 * 1024]; //将客户端套接字接收到的数据存入内存缓冲区，并获取长度 int length = socketclient.Receive(arrRecvmsg); //将套接字获取到的字符数组转换为人可以看懂的字符串 string strRevMsg = Encoding.UTF8.GetString(arrRecvmsg, 0, length); if (x == 1) { textBox3.AppendText("服务器:" + GetCurrentTime() + "\r\n" + strRevMsg + "\r\n\n"); } else { textBox3.AppendText(strRevMsg + "\r\n\n"); x = 1; } } catch(Exception ex) { textBox3.AppendText("远程服务器已经中断连接"+"\r\n"); this.button1.Enabled = true; break; } } } //获取当前系统时间 private DateTime GetCurrentTime() { DateTime currentTime = new DateTime(); currentTime = DateTime.Now; return currentTime; } //发送字符信息到服务端的方法 private void ClientSendMsg(string sendMsg) { //将输入的内容字符串转换为机器可以识别的字节数组 byte[] arrClientSendMsg = Encoding.UTF8.GetBytes(sendMsg); //调用客户端套接字发送字节数组 socketclient.Send(arrClientSendMsg); //将发送的信息追加到聊天内容文本框中 textBox3.AppendText(this.label4.Text+": " + GetCurrentTime() + "\r\n" + sendMsg + "\r\n\n"); } //点击按钮button2 向服务端发送信息 private void button2_Click(object sender, EventArgs e) { //调用ClientSendMsg方法 将文本框中输入的信息发送给服务端 ClientSendMsg(textBox4.Text.Trim()); textBox4.Clear(); } private void textBox4_KeyDown_1(object sender, KeyEventArgs e) { //当光标位于文本框时 如果用户按下了键盘上的Enter键 if (e.KeyCode == Keys.Enter) { //则调用客户端向服务端发送信息的方法 ClientSendMsg(textBox4.Text.Trim()); textBox4.Clear(); } } private void Form1_Load(object sender, EventArgs e) { } private void Form1_FormClosing(object sender, FormClosingEventArgs e) { DialogResult result = MessageBox.Show("是否退出？选否,最小化到托盘", "操作提示", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question); if (result == DialogResult.Yes) { this.Dispose(); } else if (result == DialogResult.Cancel) { e.Cancel = true; } else { e.Cancel = true; this.WindowState = FormWindowState.Minimized; this.Visible = false; this.notifyIcon1.Visible = true; this.ShowInTaskbar = false; } } private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e) { base.Visible = true; this.notifyIcon1.Visible = false; this.ShowInTaskbar = true; //base.Show(); base.WindowState = FormWindowState.Normal; } } }
程序还有不足，后期还会继续改进
客户端在断开连接后，应该把socket关闭；
if (result == DialogResult.Yes)
{
if (socketclient == null)
{
this.Dispose();
}
else
{
socketclient.Close();
this.Dispose();
}
}
其他错误，欢迎大家指出，需要完善的地方，也希望大家给出建议