我正在尝试不使用@KafkaListener注释为主题创建Kafka使用者。我想这样做是因为我试图基于application.properties动态创建侦听器,而不使用spring boot。
我认为最好的方法是手动创建KafkaListenerContainerFactory。有人可以在自己的类中提供如何执行此操作的示例。
答案 0 :(得分:1)
@Bean
public KafkaMessageListenerContainer<String, String> messageListenerContainer(String topic) {
ContainerProperties containerProperties = new ContainerProperties(topic);
containerProperties.setMessageListener(new MyMessageListener());
ConsumerFactory<String, String> consumerFactory = new DefaultKafkaConsumerFactory<>(consumerProperties());
KafkaMessageListenerContainer<String, String> listenerContainer = new KafkaMessageListenerContainer<>(consumerFactory, containerProperties);
listenerContainer.setAutoStartup(false);
// bean name is the prefix of kafka consumer thread name
listenerContainer.setBeanName("kafka-message-listener");
return listenerContainer;
}
private Map<String, Object> consumerProperties(){
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.GROUP_ID_CONFIG, "test");
return props;
}
static class MyMessageListener implements MessageListener<String, String>
@Override
public void onMessage(ConsumerRecord<String, String> data) {
// do something
}
}
Properties props = new Properties();
props.setProperty("bootstrap.servers", "localhost:9092");
props.setProperty("group.id", "test");
props.setProperty("enable.auto.commit", "true");
props.setProperty("auto.commit.interval.ms", "1000");
props.setProperty("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.setProperty("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
consumer.subscribe(Arrays.asList("foo", "bar"));
while (true) {
ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(100));
for (ConsumerRecord<String, String> record : records)
System.out.printf("offset = %d, key = %s, value = %s%n", record.offset(), record.key(), record.value());
}
答案 1 :(得分:0)
我有同样的需要。我不想使用低级消费者并自己打民意测验。我想使用@KafkaListener相同的逻辑,只是动态地对其进行配置,尤其是根据配置创建多个Kafka侦听器。
下面的解决方案是我想要的: http://www.douevencode.com/articles/2017-12/spring-kafka-without-annotations/