配置消费者工厂

   /**
     * 构建kafka消费者参数
     *
     * @return kafka消费者参数
     */
    @Bean
    public ConsumerFactory<String, String> consumerFactory() {
        List<String> brokerList = kafkaConfigProperties.getBrokerList();
        if (CollectionUtils.isEmpty(brokerList)) {
            log.info("kafka主机配置为空！");
            throw new IllegalArgumentException("kafka--broker 为空！");
        }
        HashMap<String, Object> hashMap = new HashMap<>();
        // 连接服务器地址
        hashMap.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, StringUtils.join(kafkaConfigProperties.getBrokerList(), ","));
        // key 序列化
        hashMap.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
        // value 序列化
        hashMap.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
        hashMap.put(ConsumerConfig.MAX_POLL_RECORDS_CONFIG, Optional.ofNullable(kafkaConfigProperties.getMaxPollRecords()).orElse(500));
        return new DefaultKafkaConsumerFactory<>(hashMap);
    }

配置监听工厂

    /**
     * 构建kafka监听工厂
     *
     * @param consumerFactory 消费者参数
     * @return 监听工厂
     */
    @Bean
    public ConcurrentKafkaListenerContainerFactory<String, String> kafkaListenerContainerFactory(ConsumerFactory<String, String> consumerFactory) {
        ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<>();
        factory.setConsumerFactory(consumerFactory);
        // 设置 分区数
        factory.setConcurrency(Optional.ofNullable(kafkaConfigProperties.getPartitionNum()).orElse(1));
        factory.setBatchListener(true);
        factory.getContainerProperties().setPollTimeout(3000);
        return factory;
    }

构建监听工厂

    /**
     * 构建kafka消费者监听工厂
     *
     * @param consumerInfo 消费者信息
     * @return 监听工厂
     */
    public static KafkaMessageListenerContainer<String, String> buildKafkaListenerContainerFactory(KafkaConsumerInfoDto consumerInfo) {
        ConsumerFactory<String, String> consumerFactory = SpringUtil.getBean("consumerFactory", ConsumerFactory.class);
        // 设置订阅主题
        ContainerProperties containerProperties = new ContainerProperties(consumerInfo.getTopic());
        // 设置分组
        containerProperties.setGroupId(consumerInfo.getGroup());
        // 设置监听 listener
        containerProperties.setMessageListener(new KafkaBatchMessageListener(consumerInfo.getTopic()));
        return new KafkaMessageListenerContainer<>(consumerFactory, containerProperties);
    }

配置消费者管理


@Component
@Slf4j
public class KafkaConsumerManager {

    /**
     * 消费者集合  <consumerId, KafkaConsumerThread>
     */
    private static final Map<String, KafkaMessageListenerContainer<String, String>> KAFKA_CONSUMER_THREAD_MAP = new HashMap<>();

    /**
     * 添加消费者
     *
     * @param consumerInfo 消费者信息
     */
    public synchronized void addConsumer(KafkaConsumerInfoDto consumerInfo) {
        if (ObjectUtils.isEmpty(consumerInfo)) {
            return;
        }
        // 通过 消费者id停止线程
        stopByConsumerId(consumerInfo.getConsumerId());
        // 消费者id
        String consumerId = consumerInfo.getConsumerId();
        // 构建消费者配置信息
        KafkaMessageListenerContainer<String, String> kafkaMessageListener = KafkaUtil.buildKafkaListenerContainerFactory(consumerInfo);

        KAFKA_CONSUMER_THREAD_MAP.put(consumerId, kafkaMessageListener);
        // 启动消费者监听
        kafkaMessageListener.start();
        log.info("创建消费者: {} 成功！", consumerId);
    }

    /**
     * 停止消除
     *
     * @param consumerId 消费者id
     */
    public void stopByConsumerId(String consumerId) {
        if (StringUtils.isEmpty(consumerId)) {
            return;
        }
        KafkaMessageListenerContainer<String, String> kafkaMessageListenerContainer = KAFKA_CONSUMER_THREAD_MAP.get(consumerId);
        if (ObjectUtils.isEmpty(kafkaMessageListenerContainer)) {
            return;
        }
        // 停止消费
        kafkaMessageListenerContainer.stop();
        KAFKA_CONSUMER_THREAD_MAP.remove(consumerId);
        log.info("停止消费者: {} 成功！", consumerId);
    }

}

消费者监听程序

/**
 * kafka批量消费接口
 */
@Slf4j
public class KafkaBatchMessageListener implements BatchConsumerAwareMessageListener<String, String> {

    /**
     * 订阅主题
     */
    private String topic;

    public KafkaBatchMessageListener() { }

    public KafkaBatchMessageListener(String topic) {
        this.topic = topic;
    }

    @Override
    public void onMessage(List<ConsumerRecord<String, String>> list, Consumer<?, ?> consumer) {
        KafkaMessageService kafkaMessageService = SpringUtil.getBean(KafkaMessageService.class);
        List<String> messageList = list.stream().map(ConsumerRecord::value).collect(Collectors.toList());
        kafkaMessageService.saveToFile(messageList, topic);
        log.info("消费数量：{} 条..", list.size());
    }

}