Java实现Kafka生产者消费者功能
好久没有更新博客，最近学的东西很多，但一直忙的没有时间去写，先补充一篇kafka的，最基本的功能使用，不得不感叹大数据确实难，即使只说一个简单的功能，之前也需要铺垫很多完成的功能，比如这篇博客的前提是，你已经安装了虚拟机，里面配置了Hadoop生态组件zookeeper，安装配置了kafka，学会使用Maven，springboot等些技术，而不是直接拿来代码就可以复制粘贴。
保证你的虚拟机是可以ping通的，hmaster是我在host中配置的虚拟机IP，可以修改为自己的。
在shell中开启两个窗口，测试终端中的producer和consumer能否在同一个topic中传递消息。
启动kafka
bin/kafka-server-start.sh /config/server.properties
使用Kafka(单节点单broker) • 创建topic: zk
• kafka-topics.sh –create –zookeeper hadoop000:2181 –replication-factor 1 –partitions 1 –topic hello_topic
查看所有topic
• kafka-topics.sh –list –zookeeper hadoop000:2181
发送消息: broker
• kafka-console-producer.sh –broker-list hadoop000:9092 –topic hello_topic
消费消息: zk
• kafka-console-consumer.sh –zookeeper hadoop000:2181 –topic hello_topic –from-beginning 
Maven依赖
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| <dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>0.9.0.0</version>
</dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.11</artifactId>
<version>0.9.0.0</version>
</dependency>
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ProducerDemo
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| 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 ConsumerDemo {
public static void main(String[] args){
Properties properties = new Properties();
properties.put("bootstrap.servers", "hmaster:9092");
properties.put("group.id", "group-1");
properties.put("enable.auto.commit", "true");
properties.put("auto.commit.interval.ms", "1000");
properties.put("auto.offset.reset", "earliest");
properties.put("session.timeout.ms", "30000");
properties.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
properties.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
KafkaConsumer<String, String> kafkaConsumer = new KafkaConsumer<>(properties);
kafkaConsumer.subscribe(Arrays.asList("test"));
while (true) {
ConsumerRecords<String, String> records = kafkaConsumer.poll(100);
for (ConsumerRecord<String, String> record : records) {
System.out.printf("offset = %d, value = %s", record.offset(), record.value());
System.out.println();
}
}
}
}
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Consumer
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| 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 ConsumerDemo {
public static void main(String[] args){
Properties properties = new Properties();
properties.put("bootstrap.servers", "hmaster:9092");
properties.put("group.id", "group-1");
properties.put("enable.auto.commit", "true");
properties.put("auto.commit.interval.ms", "1000");
properties.put("auto.offset.reset", "earliest");
properties.put("session.timeout.ms", "30000");
properties.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
properties.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
KafkaConsumer<String, String> kafkaConsumer = new KafkaConsumer<>(properties);
kafkaConsumer.subscribe(Arrays.asList("test"));
while (true) {
ConsumerRecords<String, String> records = kafkaConsumer.poll(100);
for (ConsumerRecord<String, String> record : records) {
System.out.printf("offset = %d, value = %s", record.offset(), record.value());
System.out.println();
}
}
}
}
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