tencent cloud

KafkaClient {
org.apache.kafka.common.security.plain.PlainLoginModule required
username="yourinstance#yourusername"
password="yourpassword";
};

## Configure the accessed network by copying the information in the **Network** column in the **Access Mode** section on the instance details page in the console.
bootstrap.servers=ckafka-xxxxxxx
## Configure the topic by copying the information on the **Topic Management** page in the console
topic=XXX
## Configure the consumer group as needed
group.id=XXX
## The path of the JAAS configuration file named `ckafka_client_jaas.conf`
java.security.auth.login.config.plain=/xxxx/ckafka_client_jaas.conf

public class CKafkaSaslProducerDemo {

     public static void main(String args[]) {
             // Set the path of the JAAS configuration file.
             CKafkaConfigurer.configureSaslPlain();

             // Load `kafka.properties`.
             Properties kafkaProperties =  CKafkaConfigurer.getCKafkaProperties();

             Properties props = new Properties();
             // Set the access point. Obtain the access point of the corresponding topic in the console.
             props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, kafkaProperties.getProperty("bootstrap.servers"));

             // Set the access protocol.
             props.put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG, "SASL_PLAINTEXT");
             // Set the PLAIN mechanism.
             props.put(SaslConfigs.SASL_MECHANISM, "PLAIN");

             // Set the method of serializing CKafka messages.
             props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
             props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
             // Set the maximum request wait time.
             props.put(ProducerConfig.MAX_BLOCK_MS_CONFIG, 30 * 1000);
             // Set the number of retries for the client.
             props.put(ProducerConfig.RETRIES_CONFIG, 5);
             // Set the internal retry interval for the client.
             props.put(ProducerConfig.RECONNECT_BACKOFF_MS_CONFIG, 3000);
             // Construct a producer object. Note that a producer object is thread-safe, and generally one producer object is sufficient for a process.
             KafkaProducer<String, String> producer = new KafkaProducer<>(props);

             // Construct a CKafka message.
             String topic = kafkaProperties.getProperty("topic"); // Topic of the message. Enter the topic you created in the console.
             String value = "this is ckafka msg value"; // Message content

             try {
                     // Obtaining the future objects in batches can accelerate the speed. Do not include too many objects in a batch.
                     List<Future<RecordMetadata>> futures = new ArrayList<>(128);
                     for (int i =0; i < 100; i++) {
                             // Send the message and obtain a future object.
                             ProducerRecord<String, String> kafkaMessage = new ProducerRecord<>(topic, value + ": " + i);
                             Future<RecordMetadata> metadataFuture = producer.send(kafkaMessage);
                             futures.add(metadataFuture);

                     }
                     producer.flush();
                     for (Future<RecordMetadata> future: futures) {
                             // Sync the future object obtained.
                                     RecordMetadata recordMetadata = future.get();
                                     System.out.println("Produce ok:" + recordMetadata.toString());
                     }
             } catch (Exception e){
                     // If the sending still fails after the internal retries in the client, the system needs to report and handle the error.
                     System.out.println("error occurred");
             }
     }
}

Produce ok:ckafka-topic-demo-0@198
Produce ok:ckafka-topic-demo-0@199

public class CKafkaSaslConsumerDemo {
    public static void main(String args[]) {
        // Set the path of the JAAS configuration file.
        CKafkaConfigurer.configureSaslPlain();

        // Load `kafka.properties`.
        Properties kafkaProperties =  CKafkaConfigurer.getCKafkaProperties();

        Properties props = new Properties();
        // Set the access point. Obtain the access point of the corresponding topic in the console.
        props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, kafkaProperties.getProperty("bootstrap.servers"));

        // Set the access protocol.
        props.put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG, "SASL_PLAINTEXT");
        // Set the PLAIN mechanism.
        props.put(SaslConfigs.SASL_MECHANISM, "PLAIN");
        // Set the maximum interval between two polls.
        // If the consumer does not return a heartbeat message within the interval, the broker will determine that the consumer is not alive, and then remove the consumer from the consumer group and trigger rebalancing. The default value is 30s.
        props.put(ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG, 30000);
        // Set the maximum number of messages that can be polled at a time.
        // Do not set this parameter to an excessively large value. If polled messages are not all consumed before the next poll starts, load balancing is triggered and lagging occurs.
        props.put(ConsumerConfig.MAX_POLL_RECORDS_CONFIG, 30);
        // Set the method of deserializing messages.
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        // Set the consumer group of the current consumer instance after you apply for one in the console.
        // The instances in the same consumer group consume messages in load balancing mode.
        props.put(ConsumerConfig.GROUP_ID_CONFIG, kafkaProperties.getProperty("group.id"));
        // Construct a consumer object. This generates a consumer instance.
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(props);
        // Set one or more topics to which the consumer group subscribes.
        // We recommend that you configure consumer instances with the same `GROUP_ID_CONFIG` value to subscribe to the same topics.
        List<String> subscribedTopics =  new ArrayList<String>();
        // If you want to subscribe to multiple topics, add the topics here.
        // You must create the topics in the console in advance.
        String topicStr = kafkaProperties.getProperty("topic");
        String[] topics = topicStr.split(",");
        for (String topic: topics) {
            subscribedTopics.add(topic.trim());
        }
        consumer.subscribe(subscribedTopics);

        // Consume messages in loop
        while (true){
            try {
                ConsumerRecords<String, String> records = consumer.poll(1000);
                // All messages must be consumed before the next poll, and the total duration cannot exceed the timeout interval specified by `SESSION_TIMEOUT_MS_CONFIG`.
                for (ConsumerRecord<String, String> record : records) {
                    System.out.println(String.format("Consume partition:%d offset:%d", record.partition(), record.offset()));
                }
            } catch (Exception e){
                System.out.println("consumer error!");
            }
        }
    }
}

Consume partition:0 offset:298
Consume partition:0 offset:299