<!-- kafka --><dependency>    <groupId>org.apache.kafka</groupId>    <artifactId>kafka-clients</artifactId>    <version>0.11.0.0</version></dependency>

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.clients.producer.KafkaProducer;import org.apache.kafka.clients.producer.ProducerRecord;
import java.util.*;
/** * @author lw1243925457 */public class KafkaUtil {
    public static KafkaConsumer<String, String> createConsumer(String servers, String topic) {        Properties properties = new Properties();        properties.put("bootstrap.servers", servers);        properties.put("group.id", "group-1");        properties.put("enable.auto.commit", "false");        properties.put("auto.commit.interval.ms", "1000");        properties.put("auto.offset.reset", "earliest");        properties.put("session.timeout.ms", "30000");        properties.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");        properties.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        KafkaConsumer<String, String> kafkaConsumer = new KafkaConsumer<String, String>(properties);        kafkaConsumer.subscribe(Arrays.asList(topic));        return kafkaConsumer;    }
    public static void readMessage(KafkaConsumer<String, String> kafkaConsumer, int timeout) {        while (true) {            ConsumerRecords<String, String> records = kafkaConsumer.poll(timeout);            for (ConsumerRecord<String, String> record : records) {                String value = record.value();                kafkaConsumer.commitAsync();                System.out.println(value);            }        }    }
    public static KafkaProducer<String, String> createProducer(String servers) {        Properties properties = new Properties();        properties.put("bootstrap.servers", servers);        properties.put("acks", "all");        properties.put("retries", 0);        properties.put("batch.size", 16384);        properties.put("linger.ms", 1);        properties.put("buffer.memory", 33554432);        properties.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");        properties.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");        return new KafkaProducer<String, String>(properties);    }
    public static void send(KafkaProducer<String, String> producer, String topic, String message) {        producer.send(new ProducerRecord<String, String>(topic, message));    }}

public class Main {
    public static void main(String[] args) {        String servers = "localhost:9092,localhost:9093,localhost:9094";        String topic = "TestTopic";        String message = "test";
        KafkaProducer<String, String> producer = KafkaUtil.createProducer(servers);        KafkaUtil.send(producer, topic, message);
        KafkaConsumer<String, String> consumer = KafkaUtil.createConsumer(servers, topic);        KafkaUtil.readMessage(consumer, 100);    }}