kafka之使用java连接

1、导入kafka所需要的包（最后附maven依赖）

　　安装kafka时，解压后就有kafka需要的jar包，如下图所示：

　　

　　现在只需要导入这四个：kafka-clients-2.1.1.jar、log4j-1.2.17.jar、slf4j-api-1.7.25.jar、slf4j-log4j12-1.7.25.jar

　　

2、生产者类示例

public class ProducerDemo {

    private void execMsgSend() throws  Exception{
        Properties props = new Properties();
        props.put("bootstrap.servers", "192.168.23.111:9092");
        props.put("acks", "1");
        props.put("retries", 0);
        props.put("batch.size", 16384);
        props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
        props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
        Producer<String, String> procuder = new KafkaProducer<String, String>(props);

        String topic = "mydemo1";
        for (int i = 1; i <= 10; i++) {
            String value = " this is another message_" + i;
            ProducerRecord<String,String> record = new ProducerRecord<String, String>(topic,i+"",value);
            procuder.send(record,new Callback() {
                @Override
                public void onCompletion(RecordMetadata metadata, Exception exception) {
                    System.out.println("message send to partition " + metadata.partition() + ", offset: " + metadata.offset());
                }
            });
            System.out.println(i+" ----   success");
            Thread.sleep(1000);
        }
        System.out.println("send message over.");
        procuder.close();
    }

    public static void main(String[] args) throws  Exception{
        ProducerDemo test1 = new ProducerDemo();
        test1.execMsgSend();
    }
}

3、消费者类示例

public class ConsumerDemo {

    public static void main(String[] s){
        Properties props = new Properties();
        props.put("bootstrap.servers", "192.168.23.111:9092");
        props.put("group.id", "1");
        props.put("enable.auto.commit", "true");
        props.put("auto.commit.interval.ms", "1000");
        props.put("session.timeout.ms", "30000");
        props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
        consumer.subscribe(Arrays.asList("mydemo1"));
        while (true) {
            System.out.println("poll start...");
            ConsumerRecords<String, String> records = consumer.poll(100);
            int count = records.count();
            System.out.println("the numbers of topic:" + count);
            for (ConsumerRecord<String, String> record : records){
                System.out.printf("offset = %d, key = %s, value = %s", record.offset(), record.key(), record.value());
                System.out.println();
            }
        }
    }
}

 4、所需依赖

<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka-clients</artifactId>
    <version>2.1.1</version>
</dependency>