2. 新版本生产者代码--建议使用的版本

1. 开启进程

[node123]systemctl stop firewalld
 
[node123]zkServer.sh start
 
[node123]kafka-server-start.sh /opt/app/kafka-0.11.0.0/config/server.properties &
 
[node1]kafka-console-consumer.sh --zookeeper node1:2181 --topic demo

2. java导入依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
 
    <groupId>org.example</groupId>
    <artifactId>kafkacode</artifactId>
    <version>1.0-SNAPSHOT</version>
 
    <dependencies>
        <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka-clients</artifactId>
            <version>0.11.0.0</version>
        </dependency>
 
        <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka_2.12</artifactId>
            <version>0.11.0.0</version>
        </dependency>
    </dependencies>
</project>

3. java代码

package new_out;
 
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
 
import java.util.Properties;
 
// 新版本生产者代码--建议大家使用的版本
public class NewProducer {
    public static void main(String[] args) {
        Properties props = new Properties();
        // Kafka服务端的主机名和端口号
        props.put("bootstrap.servers", "192.168.200.111:9092, 192.168.200.112:9092, 192.168.200.113:9092");
        // 等待所有副本节点的应答
        props.put("acks", "all");
        // 消息发送最大尝试次数
        props.put("retries", 0);
        // 一批消息处理大小
        props.put("batch.size", 16384);
        // 请求延时
        props.put("linger.ms", 1);
        // 发送缓存区内存大小
        props.put("buffer.memory", 33554432);
        // key序列化
        props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
        // value序列化
        props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
 
        KafkaProducer<Object, Object> producer = new KafkaProducer<Object, Object>(props);
        for (int i = 0; i < 100; i++) {
            producer.send(new ProducerRecord<Object, Object>("demo", "hello--"+i));
        }
        // 必须有下面的语句才行，二选一
        // producer.commitTransaction();
        producer.close();
    }
}