Kafka：消费Topic主题下特定的分区消息

在Kafka中，要消费特定分区的消息，你需要使用KafkaConsumer类，并指定要消费的topic和分区。以下是一个简单的Java代码示例，展示如何消费特定分区的消息：

import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import java.util.Arrays;
import java.util.Properties;
 
public class KafkaPartitionConsumer {
    public static void main(String[] args) {
        // 配置Consumer
        Properties props = new Properties();
        props.put("bootstrap.servers", "localhost:9092");
        props.put("group.id", "test");
        props.put("enable.auto.commit", "true");
        props.put("auto.commit.interval.ms", "1000");
        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);
 
        // 订阅特定分区
        TopicPartition partition0 = new TopicPartition("topicName", 0); // topicName是你的topic，0是分区号
        consumer.assign(Arrays.asList(partition0));
 
        try {
            while (true) {
                ConsumerRecords<String, String> records = consumer.poll(100);
                for (ConsumerRecord<String, String> record : records) {
                    System.out.printf("offset = %d, key = %s, value = %s\n", record.offset(), record.key(), record.value());
                }
            }
        } finally {
            consumer.close();
        }
    }
}

确保替换bootstrap.servers和group.id属性值，并将topicName和分区号0替换为你要消费的实际topic和分区。这段代码将会消费指定分区的消息，并打印出来。