客户端和服务端之间的通信(UDP)
实现一个小的通信功能:客户端向服务端提交数据,然后服务端回执数据。
一、新建一个控制台应用程序:Client。
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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Net; using System.Net.Sockets; namespace Client { class Program { static void Main(string[] args) { //创建一个Socket对象 Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9050); Console.Write("向服务端提交当前时间!\n"); string dt = DateTime.Now.ToString();//获取当前时间。 byte[] send = Encoding.ASCII.GetBytes(dt); //string message = Console.ReadLine();//发送客户端输入信息。 //byte[] send = Encoding.ASCII.GetBytes(message); s.SendTo(send, (EndPoint)ipep);//向服务器发送 int length; byte[] data = new byte[1024]; IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0); EndPoint Remote = (EndPoint)(sender); length = s.ReceiveFrom(data, ref Remote);//通过ReceiveFrom接受来自服务端的数据 Console.Write("从" + Remote.ToString() + "接收信息:\n服务器已接收到客户端发送时间"); string receive = Encoding.ASCII.GetString(data, 0, length); Console.WriteLine(receive); Console.ReadLine(); } } }
二、新建一个控制台应用程序:Server。
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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Net; using System.Net.Sockets; namespace Server { class Program { static void Main(string[] args) { Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 9050); s.Bind(ipep);//使用Bind方法绑定所指定的接口使Socket与一个本地终结点相联 Console.WriteLine("等待客户端发送信息"); int length; byte[] data = new byte[1024]; IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0); EndPoint Remote = (EndPoint)(sender); length = s.ReceiveFrom(data, ref Remote); Console.Write("从" + Remote.ToString() + "接收信息:"); string receive = Encoding.ASCII.GetString(data, 0, length); Console.WriteLine(receive); //string sendString = "SerderTime from Cliend:"+receive; byte[] send = Encoding.ASCII.GetBytes(receive); s.SendTo(send, Remote); //s.Close(); Console.ReadLine(); } } }
先后运行服务端和客户端程序。执行结果如下:
三、可以进一步的完善功能:如可以让客户端每5秒钟向客户端提交一次数据。
这样只需要对程序进行一些修改:在客户端增加一个定时器,在程序运行后,每5秒钟向服务端提交一次当前时间。(在Client运行期间,Server端必须保持运行状态)
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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Net; using System.Net.Sockets; namespace Client { public class Program { //创建一个Socket对象 static Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); static IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9050); static void Main(string[] args) { Console.Write("向服务端提交当前时间!\n"); //创建一个定时器对象 System.Timers.Timer myTimer = new System.Timers.Timer(); myTimer.AutoReset = true; myTimer.Interval = 5000; myTimer.Elapsed += new System.Timers.ElapsedEventHandler(myTimer_Elapsed); myTimer.Enabled = true; Console.ReadLine(); } public static void myTimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e) { string dt = DateTime.Now.ToString(); byte[] send = Encoding.ASCII.GetBytes(dt); //string message = Console.ReadLine(); //byte[] send = Encoding.ASCII.GetBytes(message); s.SendTo(send, (EndPoint)ipep);//向服务器发送当前时间 int length; byte[] data = new byte[1024]; IPEndPoint senderEP = new IPEndPoint(IPAddress.Any, 0); EndPoint Remote = (EndPoint)(senderEP); length = s.ReceiveFrom(data, ref Remote);//通过ReceiveFrom接受来自服务端的数据 Console.Write("从" + Remote.ToString() + "接收信息:\n服务器已接收到客户端发送时间"); string receive = Encoding.ASCII.GetString(data, 0, length); Console.WriteLine(receive); Console.ReadLine(); } } }
在服务端接收和回执部分代码上添加一个while循环语句:
四、再次先后运行Server和Client。运行结果如下: