package main; import org.apache.kafka.clients.consumer.*; import org.apache.kafka.common.serialization.LongDeserializer; import org.apache.kafka.common.serialization.StringDeserializer; import java.time.Duration; import java.util.Collections; import java.util.Properties; public class App { public static void main(String[] args) throws Exception { System.out.println("开始获取"); Properties properties = new Properties(); properties.put(ConsumerConfig.GROUP_ID_CONFIG, "test-group"); properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "127.0.0.1:9092"); properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, LongDeserializer.class.getName()); properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName()); properties.put(ConsumerConfig.MAX_POLL_RECORDS_CONFIG, 10); properties.put(ConsumerConfig.FETCH_MIN_BYTES_CONFIG, 1); properties.put(ConsumerConfig.MAX_POLL_INTERVAL_MS_CONFIG, 1000); properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, true); Consumer<Long, String> consumer = new KafkaConsumer<Long, String>(properties); consumer.subscribe(Collections.singletonList("test")); System.out.println("输出"); while (true) { ConsumerRecords<Long, String> records = consumer.poll(Duration.ofSeconds(10)); long lastOffset = 0; for (ConsumerRecord<Long, String> record : records) { System.out.printf(" offset = %d, key = %s, value = %s", record.offset(), record.key(), record.value()); lastOffset = record.offset(); } System.out.println("lastOffset read: " + lastOffset); Thread.sleep(5); // Below call is important to control the offset commit. Do this call after you // finish processing the business process. consumer.commitSync(); } } }