消息推送系统

public class KafkaProducerExample {

public static void main(String[] args) throws InterruptedException {

Properties props = new Properties();

props.put("bootstrap.servers", "localhost:9092");

props.put("acks", "all");

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<>(props);

for (int i = 0; i < 100; i++) {

producer.send(new ProducerRecord<>("my-topic", Integer.toString(i), "Message " + i));

}

producer.close();

}

}

public class KafkaConsumerExample {

public static void main(String[] args) {

Properties props = new Properties();

props.put("bootstrap.servers", "localhost:9092");

props.put("group.id", "test-group");

props.put("enable.auto.commit", "true");

props.put("auto.commit.interval.ms", "1000");

props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");

props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");

Consumer<String, String> consumer = new KafkaConsumer<>(props);

consumer.subscribe(Arrays.asList("my-topic"));

while (true) {

选排课系统

ConsumerRecords<String, String> records = consumer.poll(100);

for (ConsumerRecord<String, String> record : records)

System.out.printf("offset = %d, key = %s, value = %s%n", record.offset(), record.key(), record.value());

}

}

}