Kafka使用Java客户端进行访问的示例代码

发布时间：2020-12-14 14:15:34 所属栏目：Java 来源：网络整理

导读：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 groupIdorg.apache.kafka/groupId artifactIdkafka-clients/artifactId version0.9.0.1/version/dependency 2. 生产者代码 packa

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 = %sn",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:

复制代码代码如下:

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

消费者:

复制代码代码如下:

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

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程小技巧。

（编辑：李大同）

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