//服务端：

using System.Net;

using System.Net.Sockets;

using System.Text;

using System.Threading;

Thread mythread ;

Socket socket;

// 清理所有正在使用的资源。

protected override void Dispose( bool disposing )

{

try

　 { 　　

　　 socket.Close();//释放资源

　　 mythread.Abort ( ) ;//中止线程

　 }

　 catch{ }

if( disposing )

{

if (components != null)

{

components.Dispose();

}

}

base.Dispose( disposing );

}

public static IPAddress GetServerIP()

{

IPHostEntry ieh=Dns.GetHostByName(Dns.GetHostName());

return ieh.AddressList[0];

}

private void BeginListen()

{

IPAddress ServerIp=GetServerIP();

IPEndPoint iep=new IPEndPoint(ServerIp,8000);

socket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);

byte[] byteMessage=new byte[100];

this.label1.Text=iep.ToString();

socket.Bind(iep);

// do

while(true)

{

try

{

socket.Listen(5);

Socket newSocket=socket.Accept();

newSocket.Receive(byteMessage);

string sTime = DateTime.Now.ToShortTimeString ( ) ;

string msg=sTime+":"+"Message from:";

msg+=newSocket.RemoteEndPoint.ToString()+Encoding.Default.GetString(byteMessage);

this.listBox1.Items.Add(msg);

}

catch(SocketException ex)

{

this.label1.Text+=ex.ToString();

}

}

// while(byteMessage!=null);

}

//开始监听

private void button1_Click(object sender, System.EventArgs e)

{

try

{

mythread = new Thread(new ThreadStart(BeginListen));

mythread.Start();

}

catch(System.Exception er)

{

MessageBox.Show(er.Message,"完成",MessageBoxButtons.OK,MessageBoxIcon.Stop);

}

}

//客户端：

using System.Net;

using System.Net.Sockets;

using System.Text;

private void button1_Click(object sender, System.EventArgs e)

{

BeginSend();

}

private void BeginSend()

{

string ip=this.txtip.Text;

string port=this.txtport.Text;

IPAddress serverIp=IPAddress.Parse(ip);

int serverPort=Convert.ToInt32(port);

IPEndPoint iep=new IPEndPoint(serverIp,serverPort);

byte[] byteMessage;

// do

// {

Socket socket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);

socket.Connect(iep);

byteMessage=Encoding.ASCII.GetBytes(textBox1.Text);

socket.Send(byteMessage);

socket.Shutdown(SocketShutdown.Both);

socket.Close();

// }

// while(byteMessage!=null);

}

基于TCP协议的发送和接收端

TCP协议的接收端

using System.Net.Sockets ; //使用到TcpListen类

using System.Threading ; //使用到线程

using System.IO ; //使用到StreamReader类

int port = 8000; //定义侦听端口号

private Thread thThreadRead; //创建线程，用以侦听端口号，接收信息

private TcpListener tlTcpListen; //侦听端口号

private bool blistener = true; //设定标示位，判断侦听状态

private NetworkStream nsStream; //创建接收的基本数据流

private StreamReader srRead;

private System.Windows.Forms.StatusBar statusBar1;

private System.Windows.Forms.Button button1;

private System.Windows.Forms.ListBox listBox1; //从网络基础数据流中读取数据

private TcpClient tcClient ;

private void Listen ( )

{

try

{

tlTcpListen = new TcpListener ( port ) ; //以8000端口号来初始化TcpListener实例

tlTcpListen.Start ( ) ; //开始监听

statusBar1.Text = "正在监听" ;

tcClient = tlTcpListen.AcceptTcpClient ( ) ; //通过TCP连接请求

nsStream = tcClient.GetStream ( ) ; //获取用以发送、接收数据的网络基础数据流

srRead=new StreamReader(nsStream);//以得到的网络基础数据流来初始化StreamReader实例

statusBar1.Text = "已经连接！";

while( blistener ) //循环侦听

{

string sMessage = srRead.ReadLine();//从网络基础数据流中读取一行数据

if ( sMessage == "STOP" ) //判断是否为断开TCP连接控制码

{

tlTcpListen.Stop(); //关闭侦听

nsStream.Close(); //释放资源

srRead.Close();

statusBar1.Text = "连接已经关闭！" ;

thThreadRead.Abort(); //中止线程

return;

}

string sTime = DateTime.Now.ToShortTimeString ( ) ; //获取接收数据时的时间

listBox1.Items.Add ( sTime + " " + sMessage ) ;

}

}

catch ( System.Security.SecurityException )

{

MessageBox.Show ( "侦听失败！" , "错误" ) ;

}

}

//开始监听

private void button1_Click(object sender, System.EventArgs e)

{

thThreadRead = new Thread ( new ThreadStart ( Listen ) );

thThreadRead.Start();//启动线程

button1.Enabled=false;

}

// 清理所有正在使用的资源。

protected override void Dispose( bool disposing )

{

try

{

tlTcpListen.Stop(); //关闭侦听

nsStream.Close();

srRead.Close();//释放资源

thThreadRead.Abort();//中止线程

}

catch{}

if( disposing )

{

if (components != null)

{

components.Dispose();

}

}

base.Dispose( disposing );

}

TCP协议的发送端

using System.Net.Sockets; //使用到TcpListen类

using System.Threading; //使用到线程

using System.IO; //使用到StreamWriter类

using System.Net; //使用IPAddress类、IPHostEntry类等

private StreamWriter swWriter; //用以向网络基础数据流传送数据　

private NetworkStream nsStream; //创建发送数据的网络基础数据流　

private TcpClient tcpClient;

private System.Windows.Forms.Button button1;

private System.Windows.Forms.TextBox textBox1;

private System.Windows.Forms.Button button2;

private System.Windows.Forms.TextBox textBox2;

private System.Windows.Forms.StatusBar statusBar1;

private System.Windows.Forms.Label label1;

private System.Windows.Forms.Label label2; //通过它实现向远程主机提出TCP连接申请　

private bool tcpConnect = false; //定义标识符，用以表示TCP连接是否建立

//连接　

private void button1_Click(object sender, System.EventArgs e)

{

IPAddress ipRemote ;

try

{

ipRemote = IPAddress.Parse ( textBox1.Text ) ;

}

catch //判断给定的IP地址的合法性

{

MessageBox.Show ( "输入的IP地址不合法！" , "错误提示！" ) ;

return ;

}

IPHostEntry ipHost ;

try

{

ipHost = Dns.Resolve ( textBox1.Text ) ;　

}

catch //判断IP地址对应主机是否在线

{

MessageBox.Show ("远程主机不在线！" , "错误提示！" ) ;

return ;

}

string sHostName = ipHost.HostName ;

try

{

TcpClient tcpClient = new TcpClient(sHostName,8000);//对远程主机的8000端口提出TCP连接申请

nsStream = tcpClient.GetStream();//通过申请，并获取传送数据的网络基础数据流　　

swWriter = new StreamWriter(nsStream);//使用获取的网络基础数据流来初始化StreamWriter实例

button1.Enabled = false ;

button2.Enabled = true ;

tcpConnect = true ;

statusBar1.Text = "已经连接！" ;

}

catch

{

MessageBox.Show ( "无法和远程主机8000端口建立连接！" , "错误提示！" ) ;

return ;

}

}

//发送

private void button2_Click(object sender, System.EventArgs e)

{

if (textBox2.Text !="")

{

swWriter.WriteLine(textBox2.Text);//刷新当前数据流中的数据

swWriter.Flush();

}

else

{

MessageBox.Show("发送信息不能为空！","错误提示！");

}

}

// 清理所有正在使用的资源。

protected override void Dispose( bool disposing )

{

if ( tcpConnect )

{

swWriter.WriteLine ( "STOP" ) ; //发送控制码　　

swWriter.Flush (); //刷新当前数据流中的数据　　

nsStream.Close (); //清除资源

swWriter.Close ();

}

if( disposing )

{

if (components != null)

{

components.Dispose();

}

}

base.Dispose( disposing );

}