消费者配置参数

    private Map<String, Object> defaultGoodsConsumerConfig() {
        Map<String, Object> props = Maps.newHashMap();
        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "ip:port");
        props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, true);
        props.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, "100");
        props.put(ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG, "15000");
        props.put(ConsumerConfig.MAX_POLL_RECORDS_CONFIG, "50");
        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
");
        props.put("listener.type", "batch");
        props.put(ConsumerConfig.GROUP_ID_CONFIG, "modify-group");
        props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
        props.put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG, “SASL_PLAINTEXT”);
        props.put(SaslConfigs.SASL_MECHANISM, defaultKafkaProperties.getSaslMechanism());
        props.put("sasl.jaas.config", "org.apache.kafka.common.security.plain.PlainLoginModule required username="###" password="###";
");

        return props;
    }

    @Bean(name = "defaultListenerContainerFactory")
    public KafkaListenerContainerFactory<ConcurrentMessageListenerContainer<String, String>> defaultListenerContainerFactory() {
        ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory();
        factory.setConsumerFactory(new DefaultKafkaConsumerFactory(defaultGoodsConsumerConfig()));
        factory.setConcurrency(4);
        factory.setBatchListener(true);
        factory.getContainerProperties().setPollTimeout(3000);
        log.info("KafkaDefaultConsumer factory获取实例："+ JSON.toJSONString(factory));
        return factory;
    }

       ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory();
       factory.setConsumerFactory(new DefaultKafkaConsumerFactory(defaultGoodsConsumerConfig()));
       factory.setConcurrency(4);
       //批量消费，如果不设置默认是单条消费
       factory.setBatchListener(true);
       factory.getContainerProperties().setPollTimeout(3000);

消费者监听消息

    /**
     * 监听goods变更消息
     */
    @KafkaListener(id="sync-modify-goods", topics = "${kafka.sync.goods.topic}", concurrency = "4", containerFactory = "defaultListenerContainerFactory")
    public void updateListener(List<ConsumerRecord<String, String>> records){
        for (ConsumerRecord<String, String> msg:records) {
            GoodsChangeMsg changeMsg = null;
            try {
                changeMsg = JSONObject.parseObject(msg.value(), GoodsChangeMsg.class);
                syncGoodsProcessor.handle(changeMsg);
            }catch (Exception exception) {
                log.error("解析失败{}", msg, exception);
            }
        }
    }

List<ConsumerRecord<String, String>> records可以是String[] message
，如果是逐条消费，这里配置list，kafka会根据字符串中的逗号进行分割，所以碰见该现象不要慌，看一下批量消费的配置。