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kafka java实例
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启动zookeeper和Kafka server
启动zookeeper:
bin\windows\kafka-topics.bat --list --zookeeper localhost:2181
启动Kafka Server:
bin\windows\kafka-server-start.bat config/server.properties
创建topic:
bin\windows\kafka-topics.bat --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic mykafka
编写java程序
maven pom文件添加依赖
<dependency> <groupId>org.apache.kafka</groupId> <artifactId>kafka-clients</artifactId> <version>2.2.0</version> </dependency>
生产者代码:
import java.util.Properties; import org.apache.kafka.clients.producer.KafkaProducer; import org.apache.kafka.clients.producer.Producer; import org.apache.kafka.clients.producer.ProducerRecord; public class MyProducer { public static void main(String[] args) { Properties properties = new Properties(); //server地址 properties.put("bootstrap.servers", "localhost:9092"); 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"); Producer<String, String> producer = null; try { producer = new KafkaProducer<String, String>(properties); for (int i = 0; i < 100; i++) { String msg = "Message " + i; producer.send(new ProducerRecord<String, String>("mykafka", msg));//mykafka为topic名称 System.out.println("Sent:" + msg); } } catch (Exception e) { e.printStackTrace(); } finally { producer.close(); } System.out.println("发送完成!"); } }
消费者代码:
import java.time.Duration; import java.util.Arrays; import java.util.Properties; import org.apache.kafka.clients.consumer.ConsumerRecord; import org.apache.kafka.clients.consumer.ConsumerRecords; import org.apache.kafka.clients.consumer.KafkaConsumer; public class MyConsumer { public static void main(String[] args) { Properties properties = new Properties(); //server地址 properties.put("bootstrap.servers", "localhost:9092"); properties.put("group.id", "group-2"); properties.put("enable.auto.commit", "true"); 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<>(properties); kafkaConsumer.subscribe(Arrays.asList("mykafka"));//mykafka为topic名称 while (true) { ConsumerRecords<String, String> records = kafkaConsumer.poll(Duration.ofSeconds(10)); for (ConsumerRecord<String, String> record : records) { System.out.printf("offset = %d, value = %s", record.offset(), record.value()); System.out.println(); } } } }
运行生成者和消费者main方法即可发送接收数据。
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