Java中Kafka生产者的基本实现
生产者的基本实现
引入依赖
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>2.4.1</version>
</dependency>
具体实现
设置参数-》创建生产者客户端-》创建消息-》发送消息
package com.example.kafka;
import org.apache.kafka.clients.producer.*;
import org.apache.kafka.common.serialization.StringSerializer;
import java.util.Properties;
import java.util.concurrent.ExecutionException;
public class MySimpleProducer {
private final static String TOPIC_NAME = "test";
public static void main(String[] args) throws ExecutionException,
InterruptedException {
//1.设置参数
Properties props = new Properties();
props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG,
"81.68.232.188:9092,81.68.232.188:9093,81.68.232.188:9094");
//把发送的key从字符串序列化为字节数组
props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG,
StringSerializer.class.getName());
//把发送消息value从字符串序列化为字节数组
props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG,
StringSerializer.class.getName());
//2.创建⽣产消息的客户端,传⼊参数
Producer<String, String> producer = new KafkaProducer<>(props);
//3.创建消息
//key:作⽤是决定了往哪个分区上发,value:具体要发送的消息内容
ProducerRecord<String, String> producerRecord = new ProducerRecord<>
(TOPIC_NAME, "key1", "hello, kafka");
//4.发送消息,得到消息发送的元数据并输出
RecordMetadata metadata = producer.send(producerRecord).get();
System.out.println("同步⽅式发送消息结果:" + "topic-" +
metadata.topic() + "|partition-" + metadata.partition()
+ "|offset-" + metadata.offset());
}
}
指定发送主题分区
ProducerRecord < String, String > producerRecord = new
ProducerRecord < String, String > (TOPIC_NAME, 0,
order.getOrderId().toString(), JSON.toJSONString(order));