demo

[Huauauaa]

<!-- https://mvnrepository.com/artifact/org.apache.kafka/kafka-clients -->
        <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka-clients</artifactId>
            <version>3.6.1</version>
        </dependency>

[Huauauaa]

producer

package com.hua.kafka.producer;

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.StringSerializer;

import java.util.HashMap;

public class KafkaProducerTest {

    public static void main(String[] args) {
        HashMap<String, Object> configMap = new HashMap<>();
        configMap.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
        configMap.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
        configMap.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());

        KafkaProducer<String, String> producer = new KafkaProducer<String, String>(configMap);

//        ProducerRecord<String, String> record = new ProducerRecord<String, String>("test", "key", "value");
//        producer.send(record);

        for (int i = 0; i < 10; i++) {
            ProducerRecord<String, String> record = new ProducerRecord<String, String>("test", "key" + i, "value" + i);
            producer.send(record);
        }
        producer.close();

    }
}

[Huauauaa]

consumer

package com.hua.kafka.consumer;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.common.serialization.StringDeserializer;

import java.util.Collections;
import java.util.HashMap;

public class KafkaConsumerTest {
    public static void main(String[] args) {
        HashMap<String, Object> configMap = new HashMap<>();
        configMap.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
        configMap.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
        configMap.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());

        configMap.put(ConsumerConfig.GROUP_ID_CONFIG, "huauauaa");
        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(configMap);

        consumer.subscribe(Collections.singletonList("test"));
        while (2 > 1) {
            ConsumerRecords<String, String> data = consumer.poll(100);
            for (ConsumerRecord<String, String> item : data) {
                System.out.println(item);
            }
        }

//        consumer.close();

    }
}

[Huauauaa]

2 run