Socket socketWatch = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
socketWatch.Bind(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 81));
socketWatch.Listen(20); // 参数表示最多可容纳的等待接受的传入连接数，不包含已经建立连接的。

Thread thread = new Thread(delegate(object obj)
{
 Socket socketListen = (Socket)obj;
 while (true)
 {
  Socket socket = socketListen.Accept();
  byte[] data = new byte[1024 * 1024 * 4]; // 浏览器发来的数据，限定为 4K。
  int length = socket.Receive(data, 0, data.Length, SocketFlags.None);
  socket.Send(Encoding.UTF8.GetBytes("欢迎访问 www.cftea.com\r\n" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff")));
  socket.Shutdown(SocketShutdown.Both);
  socket.Close();
 }
});

thread.IsBackground = true;
thread.Start(socketWatch);

byte[] body = Encoding.UTF8.GetBytes("欢迎访问 www.cftea.com\r\n" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff"));
byte[] head = Encoding.UTF8.GetBytes(@"HTTP/1.1 200 OK
Content-Length: " + body.Length + @"
Content-Type: text/plain
Date: " + string.Format("{0:R}", DateTime.Now) + @"
Server: Cftea Web Server

");
socket.Send(head);
socket.Send(body);

string requestText = Encoding.UTF8.GetString(data, 0, length);

Socket socketWatch = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
socketWatch.Bind(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 81));
socketWatch.Listen(20); // 参数表示最多可容纳的等待接受的传入连接数，不包含已经建立连接的。

Thread thread = new Thread(delegate(object obj)
{
 Socket socketListen = (Socket)obj;
 while (true)
 {
  using (Socket socket = socketListen.Accept())
  {
   byte[] data = new byte[1024 * 1024 * 4]; // 浏览器发来的数据
   int length = socket.Receive(data, 0, data.Length, SocketFlags.None);
   if (length > 0)
   {
    string requestText = Encoding.UTF8.GetString(data, 0, length);

    byte[] body = Encoding.UTF8.GetBytes(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff"));
    byte[] head = Encoding.UTF8.GetBytes(@"HTTP/1.1 200 OK
Content-Length: " + body.Length + @"
Content-Type: text/plain
Date: " + string.Format("{0:R}", DateTime.Now) + @"
Server: Cftea Web Server

");
    socket.Send(head);
    socket.Send(body);
   }

   socket.Shutdown(SocketShutdown.Both);
   socket.Close();
  }
 }
});

thread.IsBackground = true;
thread.Start(socketWatch);