kafka手动提交offset代码

以下是使用Java语言手动提交Kafka offset的示例代码：

import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;

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

public class KafkaConsumerExample {
    public static void main(String[] args) {
        Properties props = new Properties();
        props.put("bootstrap.servers", "localhost:9092");
        props.put("group.id", "test-group");
        props.put("enable.auto.commit", "false"); // 关闭自动提交offset
        props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");

        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
        consumer.subscribe(Collections.singletonList("test-topic"));

        try {
            while (true) {
                ConsumerRecords<String, String> records = consumer.poll(1000);
                for (ConsumerRecord<String, String> record : records) {
                    System.out.printf("offset = %d, key = %s, value = %s%n", record.offset(), record.key(), record.value());
                }
                consumer.commitSync(); // 手动提交offset
            }
        } finally {
            consumer.close();
        }
    }
}

在上面的示例代码中，通过设置`enable.auto.commit`属性为`false`，关闭了Kafka Consumer的自动提交offset功能。在消费完一批消息后，调用`consumer.commitSync()`方法手动提交offset。这样可以更灵活地控制offset的提交，避免消息重复消费或漏消费的问题。