7,540
edits
Changes
→Java consumer
==Java consumer==
<source lang="java">
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "kafka:29092");
props.put(ConsumerConfig.GROUP_ID_CONFIG, "KafkaExampleConsumer");
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, LongDeserializer.class.getName());
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
</source>
<source lang="java">
import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.common.serialization.LongDeserializer;
import org.apache.kafka.common.serialization.LongSerializer;
import org.apache.kafka.common.serialization.StringDeserializer;
import java.time.Duration;
import java.util.Collections;
import java.util.Properties;
public class KafkaConsumerExample {
private final static String TOPIC = "test2-topic";
private static Consumer<String, String> createConsumer() {
final Properties props = new Properties();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "kafka:29092");
props.put(ConsumerConfig.GROUP_ID_CONFIG, "KafkaExampleConsumer");
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, LongDeserializer.class.getName());
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
final Consumer<String, String> consumer = new KafkaConsumer<>(props);
consumer.subscribe(Collections.singletonList(TOPIC));
return consumer;
}
static void runConsumer() throws InterruptedException {
final Consumer<String, String> consumer = createConsumer();
final int giveUp = 100;
int noRecordsCount = 0;
while (true) {
final ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofSeconds(1));
if (consumerRecords.count() == 0) {
noRecordsCount++;
if (noRecordsCount > giveUp)
break;
else
continue;
}
consumerRecords.forEach(record -> {
try {
System.out.printf("Consumer Record:(key: %s value: %s, partition: %d, offset: %d)\n",record.key(), record.value(),
record.partition(), record.offset());
} catch (Exception e) {
e.printStackTrace();
}
});
consumer.commitAsync();
}
consumer.close();
System.out.println("DONE");
}
public static void main(String... args) throws Exception {
runConsumer();
}
}
</source>
<source lang="java">
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
VAGY
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.ByteArrayDeserializer");
VAGY
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.connect.json.JsonDeserializer");
</source>
==Logstash consumer==
=Adminisztrációs felületek=
