使用Java代码操作Kafka（二）：生产者同步发送 API

---

1、生产者消息发送流程

2、同步和异步的区别

3、同步发送API

package com.bigdata.kafka.producer;

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;
import java.util.concurrent.ExecutionException;

public class CustomProducerTongBu {

    // 这是一个生产者，生产者发送消息的，发给谁呢？kafka集群！
    public static void main(String[] args) throws ExecutionException, InterruptedException {

        // 这个里面放置配置相关信息
        Properties properties = new Properties();
        properties.setProperty(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG,"node01:9092");
        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");

        KafkaProducer<String, String> kafkaProducer = new KafkaProducer<String, String>(properties);
        for (int i=0;i<5;i++) {
            // 发送 send 方法调用  get() 方法是同步发送。同步发送就是等一批结束后发送另一批
            kafkaProducer.send(new ProducerRecord<>("first","bigdata: "+i)).get();
        }

        kafkaProducer.close();
    }
}