如何使用工厂为特定主题配置 Spring Kafka Listener?

本文介绍了如何使用工厂为特定主题配置 Spring Kafka Listener?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

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我希望能够通过属性读取主题，而无需在 Kafka 侦听器注释上指定任何内容.不使用 Spring Boot.

I want to be able to read in topics through the properties without specifying anything on the Kafka listener annotation. Not using Spring Boot.

我尝试通过主题"键直接从属性对象读取主题.这会产生错误:IllegalStateException:topics, topicPattern, or topicPartitions must be provided.

I tried having the topics read straight from the properties object via a "topics" key. That gives an error: IllegalStateException:topics, topicPattern, or topicPartitions must be provided.

// some class
@KafkaListener
public void listener(List<String> messages) {
  System.out.print(messages);
}

//some other class
@Bean
public ConsumerFactory<String, String> consumerFactory(Properties topicProp) {
  return new DefaultKafkaConsumerFactory(topicProp);
}

@Bean
public ConcurrentKafkaListenerContainerFactory<String, String> kafkaListenerContainerFactory() {
  ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<>();

  Properties prop = new Properties();
  prop.setProperty("topics", "my-custom-topic");

  factory.setConsumerFactory(this.consumerFactory(prop));
  return factory;
}

Is this possible?

推荐答案

您可以在 topics

@Bean
public String topicName() {
    return "my-custom-topic";
}

...

@KafkaListener(topics = "#{@topicName}")
...

或

@KafkaListener(topics = "#{@someBean.someMethod()}")

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