发送消息+同步发送

依赖

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

代码

package com.perfect.kafka;

import org.apache.kafka.clients.producer.*;
import org.junit.jupiter.api.Test;

import java.util.Properties;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

public class KafkaSynchronizedTest {

    @Test
    public void sendmessagetest(){

        Properties props = new Properties();

        props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG,"localhost:9092");

        props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringSerializer");

        props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringSerializer");

        KafkaProducer<String,String> p = new KafkaProducer<String, String>(props);

        for(int i=0;i<10;i++){
            Future<RecordMetadata>  future =  p.send(new ProducerRecord<>("topic2", "message" + i), new Callback() {
                @Override
                public void onCompletion(RecordMetadata recordMetadata, Exception e) {
                    if(e==null){
                        System.out.println(recordMetadata.partition()+"---"+recordMetadata.offset());
                    }
                }
            });


            RecordMetadata metadata = null;
            try {
                metadata = future.get();
            } catch (InterruptedException e) {
                e.printStackTrace();
            } catch (ExecutionException e) {
                e.printStackTrace();
            }
            System.out.println(metadata);

        }

        p.close();

    }
}