[大数据]kafka3.1.0 java 测试demo

前置条件

首先已经安装的Java环境，并且安装了zookeeper服务注册中心。

下载

https://kafka.apache.org//
当前最新版本3.1.0

安装

在windows解压后主要关注的是config文件下的server.properties文件，修改：

broker.id=0 //只有一个kafka就不用改
log.dirs = "" //自己要存的目录
zookeeper.connect=localhost:2181//zookeeper没有改动的化默认就行

启动

bin/windows/kafka-server-start.bat ./config/server.properties

java jar包

		<dependency>
			<groupId>org.apache.kafka</groupId>
			<artifactId>kafka-clients</artifactId>
			<version>3.1.0</version>
		</dependency>

生产者

public class Producer {
	
	public static void main(String[] args) throws InterruptedException {
		Properties p = new Properties();
        p.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "127.0.0.1:9092");//kafka地址，多个地址用逗号分割
        p.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
        p.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
        KafkaProducer<String, String> kafkaProducer = new KafkaProducer<>(p);
        int i = 0;
        try {
            while (true) {
                String msg = "Hello," + i;
                ProducerRecord<String, String> record = new ProducerRecord<String, String>("test", msg);
                kafkaProducer.send(record);
                //System.out.println("消息发送成功:" + msg);
                Thread.sleep(2000);
                i++;
            }
        } finally {
            kafkaProducer.close();
        }
	}
	
}

消费者

public class Consumer {
	
	public static void main(String[] args) {
		Properties p = new Properties();
        p.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "127.0.0.1:9092");
        p.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        p.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        p.put(ConsumerConfig.GROUP_ID_CONFIG, "duanjt_test");

        KafkaConsumer<String, String> kafkaConsumer = new KafkaConsumer<String, String>(p);
        kafkaConsumer.subscribe(Collections.singletonList("test"));// 订阅消息

        while (true) {
            ConsumerRecords<String, String> records = kafkaConsumer.poll(Duration.ZERO.withSeconds(1));
            for (ConsumerRecord<String, String> record : records) {
                System.out.println(String.format("topic:%s,offset:%d,消息:%s", //
                        record.topic(), record.offset(), record.value()));
            }
        }
	}
}