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