kakfa 手动提交消息代码

下面是 Kafka 手动提交消息的代码示例：

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.common.TopicPartition;

import java.util.Arrays;
import java.util.Collections;
import java.util.Properties;

public class KafkaConsumerManualCommitExample {
    public static void main(String[] args) {
        String topicName = "your-topic-name";
        Properties props = new Properties();
        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "your-bootstrap-server");
        props.put(ConsumerConfig.GROUP_ID_CONFIG, "your-group-id");
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, "false"); // 禁止自动提交
        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
        consumer.subscribe(Collections.singletonList(topicName));
        while (true) {
            ConsumerRecords<String, String> records = consumer.poll(1000);
            for (ConsumerRecord<String, String> record : records) {
                System.out.printf("partition = %d, offset = %d, key = %s, value = %s%n", record.partition(), record.offset(), record.key(), record.value());
                TopicPartition topicPartition = new TopicPartition(record.topic(), record.partition());
                consumer.commitSync(Collections.singletonMap(topicPartition, new OffsetAndMetadata(record.offset() + 1))); // 手动提交偏移量
            }
        }
    }
}

在代码中，我们将 `enable.auto.commit` 设置为 `false`，禁用自动提交偏移量的功能。我们在消费消息后手动提交偏移量，使用 `commitSync` 方法来提交偏移量。这个方法将会阻塞，直到提交成功或发生异常。