客戶端程式碼如下：

using UnityEngine;
using System.Collections;
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;

public class UDPClient : MonoBehaviour
{
    public string recvStr;
    private string UDPClientIP;
    string str = "客戶端01傳送訊息";
    Socket socket;
    EndPoint serverEnd;
    IPEndPoint ipEnd;

    byte[] recvData = new byte[1024];
    byte[] sendData = new byte[1024];
    int recvLen = 0;
    Thread connectThread;

    void Start()
    {
        UDPClientIP = "168.178.2.11";//服務端的IP.自己更改
        UDPClientIP = UDPClientIP.Trim();       
        InitSocket(); 
    }

    void InitSocket()
    {
        ipEnd = new IPEndPoint(IPAddress.Parse(UDPClientIP), 7401);
        socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
        IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
        serverEnd = (EndPoint)sender;
        print("等待連線");
        SocketSend(str);
        print("連線");
        //開啟一個執行緒連線
        connectThread = new Thread(new ThreadStart(SocketReceive));
        connectThread.Start();
    }
    void SocketSend(string sendStr)
    {
        //清空
        sendData = new byte[1024];
        //資料轉換
        sendData = Encoding.UTF8.GetBytes(sendStr);
        //傳送給指定服務端
        socket.SendTo(sendData, sendData.Length, SocketFlags.None, ipEnd);
    }

    //接收伺服器資訊
    void SocketReceive()
    {
        while (true)
        {

            recvData = new byte[1024];
            try
            {
                recvLen = socket.ReceiveFrom(recvData, ref serverEnd);
            }
            catch (Exception e)
            {
            }

            print("資訊來自: " + serverEnd.ToString());
            if (recvLen > 0)
            {
                recvStr = Encoding.UTF8.GetString(recvData, 0, recvLen);
            }

            print(recvStr);
        }
    }

    //連線關閉
    void SocketQuit()
    {
        //關閉執行緒
        if (connectThread != null)
        {
            connectThread.Interrupt();
            connectThread.Abort();
        }
        //最後關閉socket
        if (socket != null)
            socket.Close();
    }
    void OnApplicationQuit()
    {
        SocketQuit();
    }

    void Update()
    {

    }

}
 

伺服器程式碼如下：

using UnityEngine;
using System.Collections;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;

public class UDPServer : MonoBehaviour
{
    public string ipAddress = "168.178.2.11";
    public int ConnectPort = 7401;
    public string recvStr;

    Socket socket;
    EndPoint clientEnd;
    IPEndPoint ipEnd;
    string sendStr;
    byte[] recvData = new byte[1024];
    byte[] sendData = new byte[1024];
    int recvLen;
    Thread connectThread;
    //初始化
    void InitSocket()
    {
        ipEnd = new IPEndPoint(IPAddress.Parse(ipAddress), ConnectPort);
        socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
        socket.Bind(ipEnd);
        //定義客戶端
        IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
        clientEnd = (EndPoint)sender;
        print("等待連線資料");
        //開啟一個執行緒連線
        connectThread = new Thread(new ThreadStart(SocketReceive));
        connectThread.Start();
    }
    void SocketSend(string sendStr)
    {
        sendData = new byte[1024];
        sendData = Encoding.UTF8.GetBytes(sendStr);
        socket.SendTo(sendData, sendData.Length, SocketFlags.None, clientEnd);
    }
    //伺服器接收
    void SocketReceive()
    {
        while (true)
        {
            recvData = new byte[1024];
            recvLen = socket.ReceiveFrom(recvData, ref clientEnd);
            recvStr = Encoding.UTF8.GetString(recvData, 0, recvLen);
            Debug.Log("收到得資訊 " + recvStr);           
        }
    }

    //連線關閉
    void SocketQuit()
    {
        //關閉執行緒
        if (connectThread != null)
        {
            connectThread.Interrupt();
            connectThread.Abort();
        }
        //最後關閉socket
        if (socket != null)
            socket.Close();
        Debug.LogWarning("斷開連線");
    }

    // Use this for initialization
    void Start()
    {
        InitSocket(); //在這裡初始化server
    }

    void OnApplicationQuit()
    {
        SocketQuit();
    }

}