UDP通讯

Posted 2020-10-20 永恒921

上一篇有说到TCP通讯，这篇来谈谈UDP通讯方式

基于Udp协议是无连接模式通讯，占用资源少，响应速度快，延时低。至于可靠性，可通过应用层的控制来满足。(不可靠连接)

(1).建立一个套接字(Socket)

(2).绑定服务器端IP地址及端口号--服务器端

(3).通过SendTo()方法向指定主机发送消息(需提供主机IP地址及端口)

(4).通过ReciveFrom()方法接收指定主机发送的消息(需提供主机IP地址及端口)

UDP通讯方式：建立Socket、绑定IP与端口、发送/接收、结束；

通讯实例

UDP服务器端

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;

namespace TcpServerConsoleApp
{
    public class UdpServerApp
    {
        UdpClient _udpc;//UDP客服端
        public IPEndPoint _Ipdp;
        
        public UdpServerApp()
        {
            _Ipdp = new IPEndPoint(IPAddress.Parse("192.168.1.142"), 9005);
            _udpc = new UdpClient(_Ipdp);
            Thread clientThread = new Thread(ReciveFunc);
            clientThread.Start();

        }

        private void ReciveFunc()
        {
            //_Ipdp = new IPEndPoint(IPAddress.Any, 0);
            //Console.WriteLine("接入客服端：{0}  {1}", _Ipdp.Address.ToString(), _Ipdp.Port.ToString());
            while (true)
            {
                try
                {
                    byte[] buffer = _udpc.Receive(ref _Ipdp);

                    Console.WriteLine("接收信息：{0}", Encoding.Default.GetString(buffer));
                }
                catch
                { }
            }
        }

        public void Sendmsg(string msg)
        {
            byte[] buf = Encoding.Default.GetBytes(msg);
            _udpc.Send(buf, buf.Length, _Ipdp);
        }

    }
}

DUP客服端

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;


namespace TcpClientConsolApp
{
    public class UdpClientApp
    {
        UdpClient _udpc;//UDP客服端
      
        


        public UdpClientApp()
        {
            _udpc = new UdpClient();
            Thread clientThread = new Thread(ReciveFunc);
            clientThread.Start();
        
        }

        private void ReciveFunc()
        {
             IPEndPoint _Ipdp = new IPEndPoint(IPAddress.Any, 0);
            //Console.WriteLine("接入客服端：{0}  {1}", _Ipdp.Address.ToString(), _Ipdp.Port.ToString());
            while (true)
            {
                try
                {
                    byte[] buffer = _udpc.Receive(ref _Ipdp);

                    Console.WriteLine("接收信息：{0}", Encoding.Default.GetString(buffer));
                }
                catch
                { }
            }
        }

        public void Sendmsg(string msg)
        {
            IPEndPoint servipdt = new IPEndPoint(IPAddress.Parse("192.168.1.142"), 9005);
            byte[] buf = Encoding.Default.GetBytes(msg);
            _udpc.Send(buf, buf.Length, servipdt);
        }

    }
}

从上面对比可以看出服务端与客服端的代码大致相同。