基础 API
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>2.5.0</version>
</dependency>
package morning.cat.kafka;
import morning.cat.spring.bean.Person;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.common.serialization.StringSerializer;
import java.util.Properties;
public class KafkaProducerTest {
public static final String TOPIC = "helloTopic";
public static void main(String[] args) {
// Properties properties = new Properties();
// properties.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
// properties.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
// properties.put("bootstrap.servers", "localhost:9092");
// KafkaProducer<String, String> producer = new KafkaProducer(properties);
Map<String, String> map = new HashMap<>();
map.put("bootstrap.servers", "localhost:9092");
StringSerializer stringSerializer = new StringSerializer();
KafkaProducer<String, String> producer = new KafkaProducer(map, stringSerializer, stringSerializer);
ProducerRecord<String, String> record = new ProducerRecord<>(TOPIC, "my key", "my message");
producer.send(record);
producer.close();
}
}
package morning.cat.kafka;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.common.serialization.StringDeserializer;
import java.time.Duration;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
public class KafkaConsumerTest {
public static final String TOPIC = "helloTopic";
public static void main(String[] args) {
Map<String, String> map = new HashMap<>();
map.put("bootstrap.servers", "localhost:9092");
map.put("group.id", "no1"); // 分组
StringDeserializer stringDeserializer = new StringDeserializer();
KafkaConsumer<String, String> consumer = new KafkaConsumer(map, stringDeserializer, stringDeserializer);
consumer.subscribe(Collections.singleton(TOPIC));
while (true) {
ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(1000));
records.forEach(record -> System.out.println(record.key() + " " + record.value()));
}
}
}
