1. 首先，需要确定你的Axon框架中已经集成了Kafka，如果没有集成，可以按照Axon框架提供的文档进行集成。

2. 在Axon框架中定义Kafka订阅器，以便将事件发布到Kafka主题中。可以使用下面的代码示例：

@Configuration public class KafkaAutoConfiguration {

private final EventBus eventBus;

public KafkaAutoConfiguration(EventBus eventBus) {
    this.eventBus = eventBus;
}

@Bean
public KafkaMessageSource kafkaMessageSource(KafkaProperties kafkaProperties) {
    return new KafkaMessageSource<>(consumerFactory(kafkaProperties), new NoOpDeserializer<>(),
                                    kafkaProperties.getTopic());
}

@Bean
public ConcurrentKafkaListenerContainerFactory kafkaListenerContainerFactory(
        KafkaProperties kafkaProperties) {
    ConcurrentKafkaListenerContainerFactory factory =
            new ConcurrentKafkaListenerContainerFactory<>();
    factory.setConsumerFactory(consumerFactory(kafkaProperties));
    return factory;
}

private ConsumerFactory consumerFactory(KafkaProperties kafkaProperties) {
    Map props = new HashMap<>(kafkaProperties.buildConsumerProperties());
    return new DefaultKafkaConsumerFactory<>(props, new StringDeserializer(),
                                             new StringDeserializer());
}

@Bean
public KafkaTopicProvisioner kafkaTopicProvisioner(TopicManager topicManager) {
    return new KafkaTopicProvisioner(topicManager, KafkaTopicConfig.builder()
                                                                   .withPostCreateAction(this::subscribeHandlers)
                                                                   .build());
}

private void subscribeHandlers(String s) {
    AnnotationEventHandlerAdapter.subscribe(new KafkaHandlerAdapter(eventBus), s);
}

}

3. 接下来，在应用程序中定义事件处理器，以便从Kafka主题中接收事件。可以使用以下代码示例：

@KafkaListener(topics = "${axon.kafka.topic}") public class SampleEventHandler {

private final Logger logger = LoggerFactory.getLogger(getClass());

@Autowired
private ObjectMapper objectMapper;

@EventHandler
public void on(String eventData) throws JsonProcessingException {
    logger.debug("Received event from Kafka: {}", eventData);
    // Deserialize the event json string
    ScrumEvent event = objectMapper.readValue(eventData, ScrumEvent.class);
    // Handle the event
    // ...
}

}

这个事件处理器使用Spring Kafka的@KafkaListener注解来订阅指定的Kafka主题。一旦事件消息从Kafka主题中被接收到，它们将被反序列化