<dependency><groupId>org.apache.kafka</groupId><artifactId>kafka-clients</artifactId><version>2.0.0</version></dependency>

package com.wbg.springboot_kafka;import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.common.serialization.IntegerDeserializer;
import org.apache.kafka.common.serialization.StringDeserializer;import java.time.Duration;
import java.util.Collections;
import java.util.Properties;public class Consumer extends Thread {KafkaConsumer<Integer,String> consumer;String topic;public Consumer(String topic){Properties properties=new Properties();properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"192.168.198.129:9092,192.168.198.130:9092,192.168.198.131:9092");properties.put(ConsumerConfig.CLIENT_ID_CONFIG,"consumer");properties.put(ConsumerConfig.GROUP_ID_CONFIG,"consumer");properties.put(ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG,"30000");properties.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG,"1000"); //自动提交(批量确认)properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, IntegerDeserializer.class.getName());properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());//一个新的group的消费者去消费一个topicproperties.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG,"earliest"); //这个属性. 它能够消费昨天发布的数据 consumer=new KafkaConsumer<Integer, String>(properties); this.topic = topic; } @Override public void run() { consumer.subscribe(Collections.singleton(this.topic)); while (true){ ConsumerRecords<Integer,String> consumerRecords = consumer.poll(Duration.ofSeconds(1)); consumerRecords.forEach(record ->{ System.out.println(record.key()+"->"+record.value()+"->"+record.offset()); }); } } public static void main(String[] args) { new Consumer("test_partition").start(); } }

package com.wbg.springboot_kafka;import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.common.serialization.IntegerSerializer;
import org.apache.kafka.common.serialization.StringSerializer;import java.util.Properties;
import java.util.concurrent.TimeUnit;public class Producer extends Thread {KafkaProducer<Integer, String> producer;String topic;public Producer(String topic) {Properties properties = new Properties();properties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.198.129:9092,192.168.198.130:9092,192.168.198.131:9092");properties.put(ProducerConfig.CLIENT_ID_CONFIG, "producer");properties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, IntegerSerializer.class.getName());properties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());producer = new KafkaProducer<Integer, String>(properties);this.topic = topic;}@Overridepublic void run() {int num = 0;while (num < 20) {try {String msg = "kafka msg " + num;producer.send(new ProducerRecord<>(topic, 3, msg), ((recordMetadata, e) -> {System.out.println(recordMetadata.offset() + "->" + recordMetadata.partition());}));TimeUnit.SECONDS.sleep(2);} catch (InterruptedException e) {e.printStackTrace();}}}public static void main(String[] args) {new Producer("test_partition").start();}
}

        <dependency><groupId>org.springframework.kafka</groupId><artifactId>spring-kafka</artifactId><version>2.2.0.RELEASE</version></dependency>

spring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.IntegerSerializerspring.kafka.bootstrap-servers=192.168.198.129:9092,192.168.198.130:9092,192.168.198.131:9092spring.kafka.consumer.group-id=springboot-groupid
spring.kafka.consumer.auto-offset-reset=earliest
spring.kafka.consumer.enable-auto-commit=truespring.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.IntegerDeserializer
spring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer

@Component
public class KafkaMyConsumer {@KafkaListener(topics = {"test"})public void listener(ConsumerRecord record){Optional msg = Optional.ofNullable(record.value());if(msg.isPresent()){System.out.println(msg.get());;}}
}

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@Component
public class KafkaMyProducer {@Autowiredprivate KafkaTemplate<Integer,String> kafkaTemplate;public void send(){kafkaTemplate.send("test",1,"msgData");}
}

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@SpringBootApplication
public class SpringbootKafkaApplication {public static void main(String[] args) throws InterruptedException {ConfigurableApplicationContext context = SpringApplication.run(SpringbootKafkaApplication.class,args);KafkaMyProducer kafkaMyProducer = context.getBean(KafkaMyProducer.class);for (int i = 0; i < 10; i++) {kafkaMyProducer.send();TimeUnit.SECONDS.sleep(3);}}}