Java使用kafka发送和生产消息的示例

1. maven依赖包

<dependency>
 <groupId>org.apache.kafka</groupId>
 <artifactId>kafka-clients</artifactId>
 <version>0.9.0.1</version>
</dependency> 

2. 生产者代码

package com.lnho.example.kafka;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.ProducerRecord;
import java.util.Properties;
public class KafkaProducerExample {
 public static void main(String[] args) {
  Properties props = new Properties();
  props.put("bootstrap.servers", "master:9092");
  props.put("acks", "all");
  props.put("retries", 0);
  props.put("batch.size", 16384);
  props.put("linger.ms", 1);
  props.put("buffer.memory", 33554432);
  props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
  props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
  Producer<String, String> producer = new KafkaProducer<>(props);
  for(int i = 0; i < 100; i++)
   producer.send(new ProducerRecord<>("topic1", Integer.toString(i), Integer.toString(i)));
  producer.close();
 }
}

3. 消费者代码

package com.lnho.example.kafka;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import java.util.Arrays;
import java.util.Properties;
public class KafkaConsumerExample {
 public static void main(String[] args) {
  Properties props = new Properties();
  props.put("bootstrap.servers", "master:9092");
  props.put("group.id", "test");
  props.put("enable.auto.commit", "true");
  props.put("auto.commit.interval.ms", "1000");
  props.put("session.timeout.ms", "30000");
  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(Arrays.asList("topic1"));
  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());
  }
 }
}

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