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UDPSend：发送端脚本，Ip为接收端本地Ip, port为自定义int类型（但是要与接收端port一致）
UDPReceive：接收端脚本，port为自定义int类型（但是要与发送端port一致）

using UnityEngine;using System.Net;using System.Net.Sockets;using System.Text;public class UDPSend : MonoBehaviour{
         private string ip;   //主机ip地址    private int port;    private IPAddress ipAddress;    private IPEndPoint endPoint;    private Socket socket;    private EndPoint server;    private byte[] sendData;                //发送内容，转化为byte字节    void Awake()    {
           ip = "192.168.1.100";        port = 8899;    }    //发送函数    public void  Send(float value)             //参数不是字符串时转化为string    {
           string msg = value.ToString("0");      //传递的值转化为string               ipAddress = IPAddress.Parse(ip);            //ip地址        endPoint = new IPEndPoint(ipAddress, port);  //自定义端口号        socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);        IPEndPoint sender = new IPEndPoint(IPAddress.Any, 112);        server = (EndPoint)sender;        sendData = new byte[1024];                  //定义发送字节大小        sendData = Encoding.Default.GetBytes(msg);  //对msg编码        socket.SendTo(sendData, sendData.Length, SocketFlags.None, endPoint);   //发送信息    }    void Update()    {
           if (Input.GetKeyDown(KeyCode.A))        {
               Send(12);        }    }}

using UnityEngine;using System.Net;using System.Net.Sockets;using System.Threading;using System.Text;public class UDPReceive : MonoBehaviour{
          private IPEndPoint ipEndPoint;    private Socket socket;    private Thread thread;    private byte[] bytes;           //接收到的字节    private int bytesLength;        //长度    public string receiveMsg = "";   //接收到的信息    public bool isOver;    private int port; //端口号要与发送端一致    void Start()    {
           Init();    }    //初始化    private void Init()    {
           ipEndPoint = new IPEndPoint(IPAddress.Any, port);        socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);        socket.Bind(ipEndPoint);        thread = new Thread(new ThreadStart(Receive));      //开启一个线程，接收发送端的消息        thread.IsBackground = true;        thread.Start();    }    //接收消息函数    private void Receive()    {
           IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);        EndPoint remote = (EndPoint)sender;        while (true)        {
               bytes = new byte[1024];            bytesLength = socket.ReceiveFrom(bytes, ref remote);            receiveMsg = Encoding.ASCII.GetString(bytes, 0, bytesLength);        }    }    //实时接收消息    void Update()    {
           if (receiveMsg != "")        {
               Debug.Log(receiveMsg);            receiveMsg = "";        }    }    //关闭socket，关闭thread    private void OnDisable()    {
           if (socket != null)        {
               socket.Close();        }        if (thread != null)        {
               thread.Interrupt();            thread.Abort();        }    }}