一个Spring的KafkaConsumer侦听器可以侦听多个主题吗？

一尘不染

一个Spring的KafkaConsumer侦听器可以侦听多个主题吗？

spring-boot

有谁知道一个听众是否可以听如下多个主题？我知道只有“ topic1”有效，如果我想添加其他主题怎么办？您能在下面显示两个示例吗？谢谢您的帮助！

@KafkaListener(topics = "topic1,topic2")
public void listen(ConsumerRecord<?, ?> record, Acknowledgment ack) {
    System.out.println(record);
}

要么

ContainerProperties containerProps = new ContainerProperties(new TopicPartitionInitialOffset("topic1, topic2", 0));

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2020-05-30

共1个答案

一尘不染

是的，只需遵循@KafkaListenerJavaDocs：

/**
 * The topics for this listener.
 * The entries can be 'topic name', 'property-placeholder keys' or 'expressions'.
 * Expression must be resolved to the topic name.
 * Mutually exclusive with {@link #topicPattern()} and {@link #topicPartitions()}.
 * @return the topic names or expressions (SpEL) to listen to.
 */
String[] topics() default {};

/**
 * The topic pattern for this listener.
 * The entries can be 'topic name', 'property-placeholder keys' or 'expressions'.
 * Expression must be resolved to the topic pattern.
 * Mutually exclusive with {@link #topics()} and {@link #topicPartitions()}.
 * @return the topic pattern or expression (SpEL).
 */
String topicPattern() default "";

/**
 * The topicPartitions for this listener.
 * Mutually exclusive with {@link #topicPattern()} and {@link #topics()}.
 * @return the topic names or expressions (SpEL) to listen to.
 */
TopicPartition[] topicPartitions() default {};

因此，您的用例应类似于：

@KafkaListener(topics = {"topic1" , "topic2"})

2020-05-30