如何在spring kafka消息中添加自定义头值？

@Configuration
public class KafkaConfig {

    @Value("${spring.kafka.bootstrap-servers}")
    private String bootstrapServers;

    @Bean
    public KafkaTemplate<String, String> kafkaTemplate() {
        return new KafkaTemplate<>(producerFactory());
    }

    @Bean
    public ProducerFactory<String, String> producerFactory() {
        Map<String, Object> configProps = new HashMap<>();
        configProps.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
        // 其他配置属性...

        return new DefaultKafkaProducerFactory<>(configProps);
    }
}

@Autowired
private KafkaTemplate<String, String> kafkaTemplate;

public void sendMessage(String topic, String message, String headerKey, String headerValue) {
    Message<String> kafkaMessage = MessageBuilder
            .withPayload(message)
            .setHeader(headerKey, headerValue)
            .build();

    kafkaTemplate.send(topic, kafkaMessage);
}

@KafkaListener(topics = "myTopic", groupId = "myGroup")
public void consumeMessage(@Payload String message, @Headers MessageHeaders headers) {
    // 获取自定义头值
    String headerValue = (String) headers.get("headerKey");

    // 处理消息...
}