基本概念

代码

dependency：

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<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka-clients</artifactId>
    <version>2.1.0</version>
</dependency>

生产者：

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import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.ProducerRecord;

import java.util.Properties;

String topicName = "xx";

Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("acks", "all");
props.put("retries", 0);
props.put("batch.size", 16384);
props.put("linger.ms", 1);
props.put("buffer.memory", 33554432);
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
Producer<String, String> producer = new KafkaProducer<String, String>(props);

producer.send(new ProducerRecord<String, String>(topicName, "发送的内容"));
producer.close();

消费者：

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

import java.time.Duration;
import java.util.Collection;
import java.util.HashSet;
import java.util.Properties;

Properties properties = new Properties();
properties.put("bootstrap.servers", "localhost:9092");
properties.put("acks", "all");
properties.put("group.id", "default");
properties.put("enable.auto.commit", "false");
properties.put("auto.offset.reset", "latest");
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<>(properties);
Collection<String> topics = new HashSet<>();
topics.add("xxx");
kafkaConsumer.subscribe(topics);

Duration duration = Duration.ofSeconds(95);
while (true) {
	ConsumerRecords<String, String> records = kafkaConsumer.poll(duration);
	records.forEach(record -> {
		System.out.println(record.value());
	});
}