如何在不先从客户端接收数据的情况下获取客户端的端口和地址？

我正在制作一个简单的 UDP 聊天程序，我希望服务器能够发送到客户端，而无需先从客户端接收数据。正常情况下，服务器在接收到客户端的数据时，会获取到客户端的IP和端口，从而可以与其进行通信。

我的服务器代码：

package com.ageforce;

import java.io.*;
import java.net.*;
import java.util.Scanner;

public class ChatServer {
    DatagramSocket server;
    byte[] receivedData = new byte[1024];
    Scanner scanner = new Scanner(System.in);
    byte[] sentData;
    DatagramPacket dp2 = new DatagramPacket(receivedData, receivedData.length);

    public ChatServer() throws SocketException {
        server = new DatagramSocket(7000);
    }

    public static void main(String[] args) throws SocketException {
        ChatServer cs = new ChatServer();

        Thread receiveMessage = new Thread(() -> {
            while (true) {
                try {
                    cs.server.receive(cs.dp2);

                } catch (IOException e) {
                    e.printStackTrace();
                }

                String storedData = new String(cs.dp2.getData());
                System.out.println(storedData);
            }
        });

        Thread sendMessage = new Thread(() -> {
            while (true) {
                String sentMessage = cs.scanner.nextLine();
                cs.sentData = sentMessage.getBytes();

                // This is the area of the code where the server gets IP and port of client from the received data. I'd like this to be changed.
                InetAddress getIP = cs.dp2.getAddress();
                int port = cs.dp2.getPort();

                DatagramPacket dp3 = new DatagramPacket(cs.sentData, cs.sentData.length, getIP, port);
                try {
                    cs.server.send(dp3);

                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });


        sendMessage.start();
        receiveMessage.start();
    }
}

是否有可能做到这一点？非常感谢任何答复。