JAVA中Kafka配置

1.XXXAppication启动类中添加默认注解

2.application.properties配置文件

### kafka configure
spring.kafka.bootstrap-servers = ${kafka.ip}:9092
#spring.kafka.consumer.group-id = milestone-subscription
spring.kafka.consumer.group-id = label-common-service
spring.kafka.consumer.enable-auto-commit = false
spring.kafka.consumer.auto-offset-reset = earliest
spring.kafka.consumer.max-poll-records = 50
spring.kafka.producer.retries = 3
spring.kafka.producer.batch-size = 16384
spring.kafka.producer.buffer-memory = 33554432
spring.kafka.consumer.topic = label_generator_apg
spring.kafka.update.result.topic = label.provider.response

3.kafka配置文件

@EnableKafka
@Configuration
public class KafkaConfig {
    @Value("${spring.kafka.bootstrap-servers}")
    private String bootstrapServers;
    @Value("${spring.kafka.consumer.group-id}")
    private String groupId;
    @Value("${spring.kafka.consumer.enable-auto-commit}")
    private Boolean autoCommit;
    @Value("${spring.kafka.consumer.auto-offset-reset}")
    private String autoOffsetReset;
    @Value("${spring.kafka.consumer.max-poll-records}")
    private Integer maxPollRecords;
    @Value("${spring.kafka.producer.retries}")
    private Integer retries;
    @Value("${spring.kafka.producer.batch-size}")
    private Integer batchSize;
    @Value("${spring.kafka.producer.buffer-memory}")
    private Integer bufferMemory;
    @Bean
    public Map<String, Object> producerConfigs() {
        Map<String, Object> props = Maps.newHashMap();
        props.put(ProducerConfig.ACKS_CONFIG, "0");
        props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
        props.put(ProducerConfig.RETRIES_CONFIG, retries);
        props.put(ProducerConfig.BATCH_SIZE_CONFIG, batchSize);
        props.put(ProducerConfig.LINGER_MS_CONFIG, 1);
        props.put(ProducerConfig.BUFFER_MEMORY_CONFIG, bufferMemory);
        props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
        props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
        return props;
    }
    @Bean
    public ProducerFactory<String, String> producerFactory() {
        return new DefaultKafkaProducerFactory<>(producerConfigs());
    }
    @Bean
    public KafkaTemplate<String, String> kafkaTemplate() {
        return new KafkaTemplate<>(producerFactory());
    }
    @Bean
    public Map<String, Object> consumerConfigs() {
        Map<String, Object> props = Maps.newHashMap();
        props.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
        props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, autoCommit);
        props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, autoOffsetReset);
        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
        props.put(ConsumerConfig.MAX_POLL_RECORDS_CONFIG, maxPollRecords);
        props.put(ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG, 120000);
        props.put(ConsumerConfig.REQUEST_TIMEOUT_MS_CONFIG, 180000);
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        return props;
    }
    @Bean
    public KafkaListenerContainerFactory<?> batchFactory() {
        ConcurrentKafkaListenerContainerFactory<Integer, String> factory = new ConcurrentKafkaListenerContainerFactory<>();
        factory.setConsumerFactory(new DefaultKafkaConsumerFactory<>(consumerConfigs()));
        //设置为批量消费，每个批次数量在Kafka配置参数中设置ConsumerConfig.MAX_POLL_RECORDS_CONFIG
        factory.setBatchListener(true);
        // set the retry template
//        factory.setRetryTemplate(retryTemplate());
        factory.getContainerProperties().setAckMode(ContainerProperties.AckMode.MANUAL);
        return factory;
    }
}

4.消费topic，手动提交offerset

@Component
@Slf4j
public class OrderDataConsumer {
    @KafkaListener(topics = "${spring.kafka.consumer.topic}",containerFactory = "batchFactory")
    public void listen(List<ConsumerRecord<String,String>> records, Acknowledgment ack){
        try {
            log.info("====> Start of APGOrderDataConsumer");
            for (ConsumerRecord<String, String> record : records) {
                log.info("==> Records.offset() value is {}",record.offset());
                if (JSON.parseArray(record.value()).size() > 0) {
                    record.value() // 获取的数据是jsonArry  后续根据业务逻辑进行处理
                }else {
                    log.info("==>the list size of ConsumerRecord record is 0, no need to handle.");
                }
            } 
            //手动提交offset
            ack.acknowledge();
            log.info("==> End of APGOrderDataConsumer");
        } catch (Exception e) {
            log.error("==> Handel APGOrderDataConsumer fail, the exception is {} ", e);
        }
    }
}