kafka 生产者消费者使用案例_kafka消费者 properties

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gradle配置如下：

    implementation "org.apache.kafka:kafka-clients:$kafkaVersion"
    implementation "com.fasterxml.jackson.core:jackson-databind:2.11.2"
    compile "org.slf4j:slf4j-simple:1.7.25"

生产者代码：

    public static void main(String[] args) {
        Properties properties = new Properties();
        properties.setProperty("bootstrap.servers", "127.0.0.1:9092");
        properties.setProperty("key.serializer", StringSerializer.class.getName());
        properties.setProperty("value.serializer", StringSerializer.class.getName());
        properties.setProperty("acks", "1");
        properties.setProperty("retries", "3");
        properties.setProperty("linger.ms", "6");
 
        KafkaProducer<String, String> producer = new KafkaProducer<String, String>(properties);
        for (int i=1; i<10; i++) {
            ProducerRecord<String, String> record = new ProducerRecord<>("first_topic", i+"", "message"+i);
            producer.send(record);
        }
 
//        producer.flush();
 
        producer.close();
    }

消费者代码： 

    public static void main(String[] args) {
        Properties properties = new Properties();
        properties.setProperty("bootstrap.servers", "127.0.0.1:9092");
        properties.setProperty("key.deserializer", StringDeserializer.class.getName());
        properties.setProperty("value.deserializer", StringDeserializer.class.getName());
        properties.setProperty("group.id", "test");
//        properties.setProperty("enable.auto.commit", "false");
        properties.setProperty("auto.commit.interval.ms", "1000");
        properties.setProperty("auto.offset.reset", "earliest");
 
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(properties);
        consumer.subscribe(Arrays.asList("first_topic"));
 
        while (true){
            ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(500));
            for (ConsumerRecord<String, String> record : records){
                String partion = record.partition() + "";
                String offset = record.offset() + "";
                String key = record.key();
                String value = record.value();
                System.out.println("partion:"+partion+",offset:"+offset+",key:"+key+",value:"+value);
            }
//            consumer.commitAsync();
        }
    }