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SpringBoot使用Kafka

引入kafka依赖：

    org.apache.kafka
    kafka-clients
    2.6.0


    org.apache.kafka
    kafka-streams
    2.6.0

消息生产工具类：

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;

public class SendMessage{

    public static void sendKafkaMessage(String msg) {
        Properties properties = new Properties();
        properties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, Constants.kafka_url);//kafka地址，多个地址用逗号分割
        properties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
        properties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
        KafkaProducer kafkaProducer = new KafkaProducer<>(properties);
        try {
            ProducerRecord record = new ProducerRecord(Constants.topic, msg); //topic
            kafkaProducer.send(record);
            log.info("消息发送成功: {}", msg);
        } finally {
            kafkaProducer.close();
        }
    }
}

消息消费工具类：

import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;

public class HandlerMessage{

    public static void main(String [] args){

        KafkaConsumer kafkaConsumer = new KafkaConfigUtil().initKafkaConfig();
        while(true){
            ConsumerRecords records = kafkaConsumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord record : records) {
                log.info("Received Message: {}", record.value());
                kafkaConsumer.commitAsync();
                JSonObject kafkaMsg = JSONObject.parseObject(JSONObject.parse(record.value()).toString());
                log.info("jsonObject: {}", kafkaMsg.toString());
            }
        }
    }
}

kafka创建topic: