API普通生产者

1）导入依赖

<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>0.11.0.0</version>
</dependency>

2）编写代码

需要用到的类
KafkaProducer：需要创建一个生产者对象，用来发送数据。
ProducerConfig：获取所需的一系列配置参数。
ProducerRecord：每条数据都要封装成一个ProducerRecord对象。
1.不带回调函数的API

package com.young.springbootdemo.kafkademo;

import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.clients.producer.ProducerRecord;

import java.util.Properties;

public class MyProducer {
    public static void main(String[] args) {
        //1.创建Kafka生产者的配置信息
        Properties properties = new Properties();

        //2.指定连接的kafka集群
        properties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.235.3:9092");

        //3.ACK应答级别
        properties.put(ProducerConfig.ACKS_CONFIG, "all");

        //4.重试次数
        properties.put(ProducerConfig.RETRIES_CONFIG, 3);

        //5.批次大小
        properties.put(ProducerConfig.BATCH_SIZE_CONFIG, 16384);

        //6.等待时间
        properties.put(ProducerConfig.LINGER_MS_CONFIG, 1);

        //7.RecordAccmulator缓冲区大小
        properties.put(ProducerConfig.BUFFER_MEMORY_CONFIG, 3355432);

        //8.Key,Value序列化类
        properties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
        properties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");

        //9.创建生产者对象
        KafkaProducer<String, String> producer = new KafkaProducer<>(properties);

        for (int i = 0; i < 10; i++) {
            //10.发送数据
            producer.send(new ProducerRecord<String, String>("first", "kafka_message_" + i));
        }

        //11.关闭资源
        producer.close();

    }
}

启动一个消费者消费消息

/opt/kafka_2.11-0.11.0.3/bin # kafka-console-consumer.sh --zookeeper zkKafka1:2181 --topic first
Using the ConsoleConsumer with old consumer is deprecated and will be removed in a future major release. Consider using the new consumer by passing [bootstrap-server] instead of [zookeeper].
kafka_message_1
kafka_message_3
kafka_message_5
kafka_message_7
kafka_message_9
kafka_message_0
kafka_message_2
kafka_message_4
kafka_message_6
kafka_message_8