1、在控制台创建发送者
kafka-console-producer.sh --broker-list hadoop2:9092 --topic zz >hello world
2、消费者API
import java.util.Arrays; import java.util.Properties; import org.apache.kafka.clients.consumer.ConsumerRecord; import org.apache.kafka.clients.consumer.ConsumerRecords; import org.apache.kafka.clients.consumer.KafkaConsumer; public class CustomNewConsumer { public static void main(String[] args) { Properties props = new Properties(); // 定义kakfa 服务的地址，不需要将所有broker指定上 props.put("bootstrap.servers", "hadoop2:9092"); // 制定consumer group props.put("group.id", "test"); // 是否自动确认offset props.put("enable.auto.commit", "true"); // 自动确认offset的时间间隔 props.put("auto.commit.interval.ms", "1000"); // key的序列化类 props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer"); // value的序列化类 props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer"); // 定义consumer KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(props); // 消费者订阅的topic, 可同时订阅多个 consumer.subscribe(Arrays.asList("zz")); while (true) { // 读取数据，读取超时时间为100ms 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()); } } }
