UDP学习笔记（.NET）
以下代码来源于《C#网络编程技术教程》。
1 public class UDPComm 2 { 3 public static byte[] EncodingASCII(string buf)//编码 4 { 5 byte[] data = Encoding.ASCII.GetBytes(buf + "\r\n"); 6 return data; 7 } 8 public static string DecodingASCII(byte[] buf)//解码 9 { 10 string st = Encoding.ASCII.GetString(buf); 11 return st; 12 } 13 }
1 class UDPServer 2 { 3 static UdpClient m_server; 4 static ArrayList mblist; 5 6 static void AddMember(IPEndPoint rep)//加入组 7 { 8 mblist.Add(rep); 9 byte[] data = UDPComm.EncodingASCII("OK"); 10 m_server.Send(data, data.Length, rep); 11 } 12 static void DelMember(IPEndPoint rep)//离开组 13 { 14 mblist.Remove(rep); 15 byte[] data = UDPComm.EncodingASCII("OK"); 16 m_server.Send(data, data.Length, rep); 17 18 } 19 static void SendToMember(string buf)//组内转发数据 20 { 21 foreach (IPEndPoint mb in mblist) 22 { 23 byte[] data = UDPComm.EncodingASCII(buf); 24 m_server.Send(data, data.Length, mb); 25 } 26 } 27 28 static void Main(string[] args) 29 { 30 string m_hostIP = "127.0.0.1"; 31 int m_port = 6666; 32 IPEndPoint m_EndPoint; 33 ArrayList memberlist = new ArrayList(); 34 bool rt = false; 35 byte[] data; 36 string m_ReturnData; 37 38 //从命令行提取主机IP和端口 39 if (args.Length < 2) 40 { 41 Console.WriteLine("Usage: UDPServer hostIP port"); 42 } 43 else 44 { 45 m_hostIP = args[0].ToString(); 46 m_port = int.Parse(args[1].ToString()); 47 rt = true; 48 } 49 50 if (rt) 51 { 52 mblist = new ArrayList();//组成员列表 53 54 IPAddress m_ipA = IPAddress.Parse(m_hostIP); 55 m_EndPoint = new IPEndPoint(m_ipA, m_port); 56 m_server = new UdpClient(m_EndPoint); 57 58 Console.WriteLine("Ready for Connect......"); 59 while (true) 60 { 61 data = m_server.Receive(ref m_EndPoint);//接收数据 62 m_ReturnData = UDPComm.DecodingASCII(data); 63 64 if (m_ReturnData.IndexOf("ADD") > -1)//加入组 65 { 66 AddMember(m_EndPoint); 67 Console.WriteLine(m_EndPoint.ToString() + "has added to group"); 68 } 69 else if (m_ReturnData.IndexOf("DEL") > -1)//退出组 70 { 71 DelMember(m_EndPoint); 72 Console.WriteLine(m_EndPoint.ToString() + "has delete from group"); 73 } 74 else 75 { 76 if (mblist.Contains(m_EndPoint))//转发数据 77 { 78 SendToMember(m_ReturnData + "[" + m_EndPoint.ToString() + "]"); 79 Console.WriteLine(m_ReturnData + "[" + m_EndPoint.ToString() + "]" 80 + "has resented to member"); 81 } 82 } 83 } 84 m_server.Close(); 85 } 86 } 87 }
1 class UDPClient 2 { 3 static void Main(string[] args) 4 { 5 string m_hostIP = "127.0.0.1"; 6 int m_port = 6666; 7 UdpClient m_client; 8 bool rt = false; 9 byte[] data; 10 string m_SendData, m_ReturnData; 11 IPEndPoint m_EndPoint; 12 13 //从命令行提取服务器地址和侦听端口 14 if (args.Length < 2) 15 { 16 Console.WriteLine("Usage: UDPClient hostIP port"); 17 } 18 else 19 { 20 m_hostIP = args[0].ToString(); 21 m_port = int.Parse(args[1].ToString()); 22 rt = true; 23 } 24 25 if (rt) 26 { 27 IPAddress m_ipA = IPAddress.Parse(m_hostIP); 28 m_EndPoint = new IPEndPoint(m_ipA, m_port); 29 30 IPAddress m_ipA1 = IPAddress.Parse("127.0.0.1"); 31 IPEndPoint m_EndPoint1 = new IPEndPoint(m_ipA1, 8060); 32 //m_client = new UdpClient(); 不绑定本地终结点，系统将会随机分配一个终结点 33 m_client = new UdpClient(m_EndPoint1); 34 35 m_client.Connect(m_EndPoint); 36 37 while (true) 38 { 39 Console.WriteLine("Input [ADD|DEL|REF|QUIT|Message]:"); 40 m_SendData = Console.ReadLine(); 41 42 if(m_SendData.IndexOf("QUIT")>-1)//退出 43 { 44 m_SendData = "DEL"; 45 } 46 47 if(m_SendData.IndexOf("REF")<=-1)//刷新显示 48 { 49 data = UDPComm.EncodingASCII(m_SendData); 50 m_client.Send(data, data.Length); 51 } 52 if (m_SendData.IndexOf("QUIT") > -1) 53 break; 54 55 data = m_client.Receive(ref m_EndPoint); 56 Console.WriteLine(m_EndPoint.ToString()); 57 m_ReturnData = UDPComm.DecodingASCII(data); 58 Console.WriteLine(m_ReturnData); 59 } 60 //退出 61 Console.WriteLine("Byte!"); 62 m_client.Close(); 63 } 64 } 65 }
