可以使用ActiveMQ自带的Stomp协议来实现。Stomp是一个简单的文本协议，可以用于传输消息。以下是一个Java示例代码，该代码使用Stomp协议发送消息以及监听ActiveMQ的特定端口进行消息处理。

import org.apache.activemq.transport.stomp.Stomp;
import org.apache.activemq.transport.stomp.StompConnection;

import java.io.IOException;

public class StompExample {

    public static void main(String[] args) {
        StompConnection connection = new StompConnection();
        try {
            connection.open("localhost", 61613);

            connection.connect("", "");
            System.out.println("Connected");

            //发送消息
            sendMessage(connection, "/queue/test", "test message");

            //接收消息
            receiveMessage(connection, "/queue/test");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                connection.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    private static void sendMessage(StompConnection connection, String destination, String message) throws IOException {
        System.out.println("Sending message: " + message);
        connection.send(destination, message);
    }

    private static void receiveMessage(StompConnection connection, String destination) throws IOException, InterruptedException {
        connection.subscribe(destination);
        System.out.println("Listening for messages...");

        StompFrame received = connection.receive();
        System.out.println("Received message: " + received.getBody());
        connection.unsubscribe(destination);
    }
}

在该示例中，我们首先创建了一个StompConnection实例，并将其连接到ActiveMQ特定端口（在此示例中为61613）。然后我们建立Stomp连接，通过sendMessage方法发送消息并通过receiveMessage方法接收消息。这样，ActiveMQ就能够直接监听端口而无需添加任何发送方。