当使用 Akka Typed Actor 发送 UDP 消息时，无法直接从消息中获取发送方的地址和端口。但可以通过重写 UntypedActorContext 中的消息处理方法，并从消息的底层 Java API 中获取发送方地址和端口来解决该问题。

下面是一个示例代码段：

import akka.actor.typed.ActorRef;
import akka.actor.typed.Behavior;
import akka.actor.typed.javadsl.ActorContext;
import akka.actor.typed.javadsl.Behaviors;
import akka.actor.UntypedActorContext;
import akka.io.AbstractDatagramChannelAdapter;
import akka.io.Inet.SocketOption;
import akka.io.Udp;

import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.Collections;

public class UdpSender {
    private static final InetSocketAddress udpAddress = new InetSocketAddress("localhost", 5465);

    public static Behavior create() {
        return Behaviors.setup(context -> {
            ActorRef udp = context.spawn(UdpSend.create(), "udp-sender");
            return Behaviors.receive(String.class)
                .onMessage(String.class, msg -> {
                    String data = "Hello, " + msg;
                    ByteBuffer buffer = ByteBuffer.wrap(data.getBytes());
                    udp.tell(UdpSend.Send.create(buffer, udpAddress), context.getSelf());
                    return Behaviors.same();
                })
                .build();
        });
    }

    // UntypedActorContext 中的消息处理方法
    public static class UdpSend extends AbstractDatagramChannelAdapter {

        static final InetSocketAddress local = new InetSocketAddress("localhost", 5466);

        public UdpSend(UntypedActorContext context) {
            super(Udp.get(context.getSystem()).getManager());
            getDatagramChannel().configureBlocking(false);
            getDatagramChannel().socket().bind(local);
            register(getInput());
        }

        public static Behavior create() {
            return Behaviors.setup(ctx ->
                    Behaviors.receivePacket(Udp.Command.class)
                            .onMessage(UdpSend.Send.class, (udp, send) -> {
                                InetSocketAddress remote = send.getRemoteAddress();
                                ByteBuffer data = send.getPayload();
                                udp.tell(UdpMessage.send(data, Collections