在ActiveMQ Artemis中，生产者可以通过在消息中设置地址来确定最终的经纪人目标。下面是一个示例：

import org.apache.activemq.artemis.api.core.Message;
import org.apache.activemq.artemis.api.core.SimpleString;
import org.apache.activemq.artemis.api.core.client.*;
import org.apache.activemq.artemis.api.core.TransportConfiguration;
import org.apache.activemq.artemis.core.config.Configuration;
import org.apache.activemq.artemis.core.remoting.impl.netty.NettyConnectorFactory;
import org.apache.activemq.artemis.core.remoting.impl.netty.TransportConstants;
import java.util.HashMap;
import java.util.Map;

public class Producer {
   public static void main(final String[] args) throws Exception {
      // Set broker address and port
      Map connectionParams = new HashMap<>();
      connectionParams.put(TransportConstants.HOST_PROP_NAME, "localhost");
      connectionParams.put(TransportConstants.PORT_PROP_NAME, 61616);

      // Create transport configuration
      TransportConfiguration transportConfiguration = new TransportConfiguration(
         NettyConnectorFactory.class.getName(),
         connectionParams
      );

      // Create configuration and set broker URL
      Configuration configuration = new Configuration();
      configuration.addAcceptorConfiguration(transportConfiguration.getName(), transportConfiguration);
      configuration.setBrokerURL("tcp://localhost:61616");

      // Create client session factory
      ServerLocator serverLocator = ActiveMQClient.createServerLocatorWithoutHA(transportConfiguration);
      ClientSessionFactory sessionFactory = serverLocator.createSessionFactory();

      // Create client session and producer
      ClientSession session = sessionFactory.createSession();
      ClientProducer producer = session.createProducer();

      // Create message 
      SimpleString address = new SimpleString("queue.example");
      Message message = session.createMessage(true);
      message.setAddress(address);
      message.getBodyBuffer().writeString("Hello, World!");

      // Send message
      producer.send(address, message);

      // Close session and producer
      session.close();
      producer.close();
   }
}

在上面的示例中，创建了一个消息并将其地址设置为“queue.example”，因此该消息将被发送到名为“queue.example”的队列上。生产者可以通过更改地址来将消息发送到所需的队列或主题。