Spring KafkaTemplate 注解式实现 工厂模式

实现注解式注入kafkaTemplate 生产者和消费者，简化配置文件

目录

消费者工厂

/**
 * 消费者工厂
 */
@EnableKafka
@Configuration
public class KafkaConsumerFactory {

    @Autowired
    private ApplicationContext context;

    /**
     * 获取消费者工厂
     */
    public ConsumerFactory<String, String> consumerFactory(String kafkaBroker) {

        // 消费者配置信息
        Map<String, Object> props = new HashMap<>();
        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, kafkaBroker);
        props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, Boolean.TRUE);
        props.put(ConsumerConfig.MAX_POLL_RECORDS_CONFIG, 10);
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);

        return new DefaultKafkaConsumerFactory<>(props);
    }

    /**
     * 容器配置
     *
     * @param groupId   组名
     * @param clazz     消费者监听器
     * @param topicName topicName
     * @return 容器配置
     */
    public ContainerProperties containerProperties(String groupId, Class clazz, String topicName) {

        ContainerProperties containerProperties = new ContainerProperties(topicName);
        containerProperties.setAckMode(AbstractMessageListenerContainer.AckMode.RECORD);
        containerProperties.setGroupId(groupId);
        containerProperties.setMessageListener(context.getBean(clazz));
        return containerProperties;
    }

    /**
     * 获取消费容器实例
     *
     * @param kafkaBroker kafka server
     * @param groupId     组名
     * @param clazz       消费者监听器
     * @param topicName   topicName
     * @param threadCount 消费线程数
     * @return 消息监听容器
     */
    public ThreadMessageListenerContainer<String, String> kafkaListenerContainer(
            String kafkaBroker, String groupId, Class clazz, String topicName, int threadCount) {

        ThreadMessageListenerContainer<String, String> container
                = new ThreadMessageListenerContainer<>(
                consumerFactory(kafkaBroker), containerProperties(groupId, clazz, topicName));
        container.setConcurrency(threadCount);
        container.getContainerProperties().setPollTimeout(3000);
        return container;
    }

}

生产者工厂

/**
 * 生产者工厂
 */
@EnableKafka
@Configuration
public class KafkaProducerFactory {

    @Autowired
    private ApplicationContext context;

    /**
     * 获取生产者工厂
     */
    public ProducerFactory<String, String> producerFactory(String kafkaBroker) {

        Map<String, Object> props = new HashMap<>();
        props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, kafkaBroker);
        props.put(ProducerConfig.RETRIES_CONFIG, 1);
        props.put(ProducerConfig.ACKS_CONFIG, "all");
        props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
        props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class);

        return new DefaultKafkaProducerFactory<>(props);
    }

    /**
     * 注册生产者实例
     */
    public KafkaTemplate<String, String> kafkaTemplate(String kafkaBroker, String topicName, Class clazz) {

        KafkaTemplate<String, String> template = new KafkaTemplate<>(producerFactory(kafkaBroker), Boolean.FALSE);
        template.setDefaultTopic(topicName);
        template.setProducerListener((ProducerListener<String, String>) context.getBean(clazz));
        return template;
    }
}

初始化监听器、实例

/**
 * kafka 初始化
 */
@Component
public class KafkaInit {

    /**
     * kafka server
     */
    @Value("${kafka.servers}")
    private String kafkaBroker;

    /**
     * 组名
     */
    @Value("${kafka.group}")
    private String groupId;

    /**
     * topicName
     */
    @Value("${kafka.topic}")
    private String topicName;

    /**
     * 消费者工厂
     */
    @Autowired
    private KafkaConsumerFactory kafkaConsumerFactory;

    /**
     * 生产者工厂
     */
    @Autowired
    private KafkaProducerFactory kafkaProducerFactory;

    /**
     * 在服务器加载Servlet的时候运行，并且只会被服务器调用一次
     */
    @PostConstruct
    public void consumer() {

        kafkaConsumerFactory.kafkaListenerContainer(kafkaBroker, groupId, TestConsumerListener.class, topicName, 6)
                .startContainer();
        // 加载消费者listener

    }

    /**
     * 获取生产者实例
     */
    @Bean("testSender")
    public KafkaTemplate<String, String> testSender() {

        return kafkaProducerFactory.kafkaTemplate(kafkaBroker, topicName, DefaultProducerListener.class);
    }

}

用于手动控制容器加载

/**
 * 继承消息监听容器
 */
public class ThreadMessageListenerContainer<K, V> extends ConcurrentMessageListenerContainer<K, V> {

    public ThreadMessageListenerContainer(ConsumerFactory<K, V> consumerFactory, ContainerProperties containerProperties) {
        super(consumerFactory, containerProperties);
    }

    public void startContainer() {
        super.doStart();
    }
}

生产者监听器

/**
 * 默认生产者监听器
 */
@Component
public class DefaultProducerListener extends ProducerListenerAdapter {

    /**
     * 发送消息成功后调用
     */
    @Override
    public void onSuccess(String topic, Integer partition, Object key,
                          Object value, RecordMetadata recordMetadata) {
        super.onSuccess(topic, partition, key, value, recordMetadata);
        System.out.println("消息发送成功！");
    }

    /**
     * 发送消息错误后调用
     */
    @Override
    public void onError(String topic, Integer partition, Object key,
                        Object value, Exception exception) {
        super.onError(topic, partition, key, value, exception);
        System.out.println("消息发送失败！");
    }

    /**
     * 是否开启发送监听
     *
     * @return true开启，false关闭
     */
    @Override
    public boolean isInterestedInSuccess() {
        return true;
    }

}

消费者监听器

/**
 * 消费者监听器
 */
@Component
public class TestConsumerListener implements MessageListener<String, String> {

    /**
     * 消费消息
     *
     * @param record 消息
     */
    @Override
    public void onMessage(ConsumerRecord<String, String> record) {

        System.out.println(record);
    }
}

消息发送测试

/**
 * 消息发送
 */
@Component
public class TestProducerSender {

    /**
     * 转账队列发送
     */
    @Autowired
    @Qualifier("testSender")
    private KafkaTemplate kafkaTemplate;

    /**
     * 消息发送测试
     */
    public void sendMessage() {

        kafkaTemplate.sendDefault("message test");
    }
}