说明

CompletableFuture对象需要的SpringBoot版本为3.X.X以上，需要的kafka依赖版本为3.X.X以上，需要的jdk版本17以上。

1、阻塞式（等待式）获取生产者发送的消息

生产者：

package com.power.producer;import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.common.header.Headers;
import org.apache.kafka.common.header.internals.RecordHeaders;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.support.KafkaHeaders;
import org.springframework.kafka.support.SendResult;
import org.springframework.messaging.Message;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.stereotype.Component;
import org.springframework.util.concurrent.ListenableFuture;import javax.annotation.Resource;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.ExecutionException;@Component
public class EventProducer {@Resourceprivate KafkaTemplate<String,String> kafkaTemplate;public void getResult(){//Integer partition, Long timestamp, K key, @Nullable V dataCompletableFuture<SendResult<String, String>> result =kafkaTemplate.sendDefault(0, System.currentTimeMillis(), "k3", "hello-kafka");//怎么拿结果，通过ListenableFuture类拿结果try {//1、阻塞式等待拿结果SendResult<String, String> sendResult = result.get();if(null!=sendResult.getRecordMetadata()){//kafka服务器确认已经拿到了消息System.out.println("消息发送成功："+sendResult.getRecordMetadata().toString());}System.out.println("producerRecord:"+sendResult.getProducerRecord());} catch (Exception e) {e.printStackTrace();}}
}

测试类：

package com.power;import com.power.producer.EventProducer;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;import javax.annotation.Resource;@SpringBootTest
public class SpringBoot01KafkaBaseApplication {@Resourceprivate EventProducer eventProducer;@Testvoid getResult(){eventProducer.getResult();}
}

测试结果：

消息发送成功：default-topic-0@1
2024-08-22 22:18:51.344  INFO 8976 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.ConsumerCoordinator  : [Consumer clientId=consumer-hello-group-1, groupId=hello-group] Adding newly assigned partitions: hello-topic-0
producerRecord:ProducerRecord(topic=default-topic, partition=0, headers=RecordHeaders(headers = [], isReadOnly = true), key=k3, value=hello-kafka, timestamp=1724336330821)

2、非阻塞式（非等待式）获取生产者发送的消息

生产者：

package com.power.producer;import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.common.header.Headers;
import org.apache.kafka.common.header.internals.RecordHeaders;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.support.KafkaHeaders;
import org.springframework.kafka.support.SendResult;
import org.springframework.messaging.Message;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.stereotype.Component;
import org.springframework.util.concurrent.ListenableFuture;import javax.annotation.Resource;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;@Component
public class EventProducer {@Resourceprivate KafkaTemplate<String,String> kafkaTemplate;public void getResult2(){//Integer partition, Long timestamp, K key, @Nullable V dataCompletableFuture<SendResult<String, String>> result =kafkaTemplate.sendDefault(0, System.currentTimeMillis(), "k3", "hello-kafka");//怎么拿结果，通过CompletableFuture类拿结果try {//2、非阻塞式等待拿结果result.thenAccept((sendResult)->{if(null!=sendResult.getRecordMetadata()){//kafka服务器确认已经拿到了消息System.out.println("消息发送成功："+sendResult.getRecordMetadata().toString());}System.out.println("producerRecord:"+sendResult.getProducerRecord());}).exceptionally((e)->{e.printStackTrace();//做消息发送失败的处理System.out.println("消息发送失败");return null;});} catch (Exception e) {e.printStackTrace();}}}

测试类：

@Test
void getResult2(){eventProducer.getResult2();
}