Kafka使用Java客户端进行访问

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本文环境如下：
操作系统：CentOS 6 32位
JDK版本：1.8.0_77 32位
Kafka版本：0.9.0.1(Scala 2.11)

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());        }    }}

4. 执行程序

lib底下需要有：kafka-clients-0.9.0.1.jar log4j-1.2.17.jar slf4j-api-1.7.6.jar slf4j-log4j12-1.7.6.jar
生产者:

java -classpath kafka-example-1.0-SNAPSHOT.jar:lib/* com.lnho.example.kafka.KafkaProducerExample

消费者:

java -classpath kafka-example-1.0-SNAPSHOT.jar:lib/* com.lnho.example.kafka.KafkaConsumerExample

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