Socket 学习（三）.2 udp 穿透 服务端 与 客户端 通讯

之前演示的 是 局域网通讯，也可以用作服务器之间的通讯，不能穿透。 想要穿透就要用 udp 了， 后续再讲解 udp 打洞 .

客户端:

using System;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Net;
using System.Text;
using  System.Threading;

namespace WinFormP2pClient
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            CheckForIllegalCrossThreadCalls = false;// 禁止线程检查
            InitializeComponent();
        }

        private UdpClient _udpClient;
        private IPEndPoint _serverIpEndPoint;
        private Thread _threadReceive;
        // 线程 接收
        private void Button1Click(object sender, EventArgs e)
        {
            _udpClient = new UdpClient();//不指定自己的端口
            _serverIpEndPoint = new IPEndPoint(IPAddress.Parse(textBoxIP.Text), );//服务端IP、端口 本地测试就用127.0.0.1 就好
            byte[] buffer = Encoding.UTF8.GetBytes("你好");
            _udpClient.Send(buffer, buffer.Length, _serverIpEndPoint);//与服务端牵手

            _threadReceive = new Thread(Receive);
            _threadReceive.Start();

        }

        private void Receive()
        {
            try
            {
                while (true)
                {
                    Byte[] buffer = _udpClient.Receive(ref _serverIpEndPoint);
                    textBox1.Text = Encoding.UTF8.GetString(buffer) + _serverIpEndPoint;

                }
            }
            catch
            {
                _threadReceive.Abort();
            }

        }

        private void Form1FormClosing(object sender, FormClosingEventArgs e)
        {
            _udpClient.Close();
        }
    }
}

服务端：

using System;
using System.Text;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Net;
using System.Threading;

namespace WinFormP2pServer
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            CheckForIllegalCrossThreadCalls = false;
            InitializeComponent();
        }

        private readonly UdpClient _udpClientServer = new UdpClient();//只允许别人用这个端口号连接我  ， udp 服务端
        private IPEndPoint _clientIpEndPoint = new IPEndPoint(IPAddress.Any, );// 允许任何人联系我 ， 对方的连接 对象
        private Thread _threadReceive;
        private void Form1Load(object sender, EventArgs e)
        {
            _threadReceive = new Thread(Receive);
            _threadReceive.Start();

        }

        private void Receive()
        {
            try
            {
                while (true)
                {
                    Byte[] buffer = _udpClientServer.Receive(ref _clientIpEndPoint);
                    textBox1.Text = Encoding.UTF8.GetString(buffer) + _clientIpEndPoint;

                }
            }
            catch
            {
                _threadReceive.Abort();
            }

        }

        private void Form1FormClosing(object sender, FormClosingEventArgs e)
        {
            _udpClientServer.Close();
            _threadReceive.Abort();
        }

        private void Button1Click(object sender, EventArgs e)
        {
            try
            {
                var temp = Encoding.UTF8.GetBytes("Hello");
                _udpClientServer.Send(temp, temp.Length, _clientIpEndPoint);
            }
            catch
            {

            }

        }
    }
}

效果图：

这里其实已经实现穿透了。。。