要使用不启动Kafka监听器的模式确认消费者/生产者，可以使用KafkaConsumer和KafkaProducer类的poll()方法来手动控制消息的消费和生产。

下面是一个示例代码：

生产者代码：

import org.apache.kafka.clients.producer.*;

import java.util.Properties;

public class ProducerExample {

    private static final String TOPIC_NAME = "my-topic";
    private static final String BOOTSTRAP_SERVERS = "localhost:9092";

    public static void main(String[] args) {
        Properties props = new Properties();
        props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, BOOTSTRAP_SERVERS);
        props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
        props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");

        KafkaProducer producer = new KafkaProducer<>(props);

        for (int i = 0; i < 10; i++) {
            ProducerRecord record = new ProducerRecord<>(TOPIC_NAME, Integer.toString(i), "Message " + i);
            producer.send(record, new Callback() {
                @Override
                public void onCompletion(RecordMetadata metadata, Exception exception) {
                    if (exception != null) {
                        System.err.println("Error producing message: " + exception.getMessage());
                    } else {
                        System.out.println("Message sent successfully. Offset: " + metadata.offset());
                    }
                }
            });
        }

        producer.close();
    }
}

消费者代码：

import org.apache.kafka.clients.consumer.*;

import java.util.Arrays;
import java.util.Properties;

public class ConsumerExample {

    private static final String TOPIC_NAME = "my-topic";
    private static final String BOOTSTRAP_SERVERS = "localhost:9092";
    private static final String GROUP_ID = "my-group";

    public static void main(String[] args) {
        Properties props = new Properties();
        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, BOOTSTRAP_SERVERS);
        props.put(ConsumerConfig.GROUP_ID_CONFIG, GROUP_ID);
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");

        KafkaConsumer consumer = new KafkaConsumer<>(props);

        consumer.subscribe(Arrays.asList(TOPIC_NAME));

        while (true) {
            ConsumerRecords records = consumer.poll(1000);
            for (ConsumerRecord record : records) {
                System.out.println("Received message: " + record.value() + ", Offset: " + record.offset());
            }
        }
    }
}

这个示例代码中，生产者会发送10条消息到名为"my-topic"的主题，而消费者会从该主题中接收消息并打印出来。注意消费者使用了一个永不退出的循环来持续消费消息，直到程序被终止。

你需要确保Kafka集群已经运行在本地，并且主题"my-topic"已经存在。你可以根据需要修改代码中的主题名称、引导服务器地址和其他配置。