Kafka生产者和消费者高级用法及说明

// 示例代码：使用 Kafka 事务
producer.initTransactions();
try {
   
   
    producer.beginTransaction();
    producer.send(new ProducerRecord<>("my-topic", "key", "value"));
    producer.send(new ProducerRecord<>("my-other-topic", "key", "value"));
    producer.commitTransaction();
} catch (ProducerFencedException | OutOfOrderSequenceException | AuthorizationException e) {
   
   
    producer.close();
} catch (KafkaException e) {
   
   
    producer.close();
    throw e;
}

// 示例代码：多线程消费者
properties.put("max.poll.records", 500);
properties.put("max.poll.interval.ms", 300000);

Consumer<String, String> consumer = new KafkaConsumer<>(properties);

// 订阅主题 "my-topic"
consumer.subscribe(Collections.singletonList("my-topic"));

// 多线程消费消息
int numberOfThreads = 5;
ExecutorService executor = Executors.newFixedThreadPool(numberOfThreads);
while (true) {
   
   
    ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(100));
    for (ConsumerRecord<String, String> record : records) {
   
   
        executor.submit(() -> processRecord(record));
    }
}

// 关闭消费者
consumer.close();
executor.shutdown();

// 示例代码：自定义序列化器
public class CustomSerializer implements Serializer<MyObject> {
   
   
    @Override
    public byte[] serialize(String topic, MyObject data) {
   
   
        // 实现自定义序列化逻辑
    }
}