tencent cloud

<dependencies>
   <dependency>
      <groupId>org.apache.kafka</groupId>
      <artifactId>kafka-clients</artifactId>
      <version>2.1.0</version>
   </dependency>
   <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.5</version>
   </dependency>
   <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-simple</artifactId>
      <version>1.6.4</version>
   </dependency>
</dependencies>


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
## SASL configuration
java.security.auth.login.config.plain=/xxxx/ckafka_client_jaas.conf
## SSL certificate configuration, which takes effect when the access mode is specified as SASL_SSL
ssl.truststore.location=/xxxx/client.truststore.jks
ssl.truststore.password=5fi6R!M
ssl.endpoint.identification.algorithm=


public class CKafkaConfigurer {
    private static Properties properties;
    public static void configureSaslPlain() {
        // If you have used the `-D` parameter or another method to set the path, do not set it again here
        if (null == System.getProperty("java.security.auth.login.config")) {
            // Replace `XXX` with your own path
            System.setProperty("java.security.auth.login.config",
                    getCKafkaProperties().getProperty("java.security.auth.login.config.plain"));
        }
    }
    public synchronized static Properties getCKafkaProperties() {
        if (null != properties) {
            return properties;
        }
        // Get the content of the configuration file `kafka.properties`.
        Properties kafkaProperties = new Properties();
        try {
            kafkaProperties.load(CKafkaProducerDemo.class.getClassLoader().getResourceAsStream("kafka.properties"));
        } catch (Exception e) {
            System.out.println("getCKafkaProperties error");
        }
        properties = kafkaProperties;
        return kafkaProperties;
    }
}


   public class KafkaSaslProducerDemo {
   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. Get the access point of the corresponding topic in the console.
      props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG,
              kafkaProperties.getProperty("bootstrap.servers"));
      //
      // Use SASL_SSL for public network access.
      //
      // Set the access protocol.
      props.put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG, "SASL_SSL");
      // Use Plain mode for SASL.
      props.put(SaslConfigs.SASL_MECHANISM, "PLAIN");
      // Set SSL encryption.
      props.put(SslConfigs.SSL_TRUSTSTORE_LOCATION_CONFIG, kafkaProperties.getProperty(SslConfigs.SSL_TRUSTSTORE_LOCATION_CONFIG));
      props.put(SslConfigs.SSL_TRUSTSTORE_PASSWORD_CONFIG, kafkaProperties.getProperty(SslConfigs.SSL_TRUSTSTORE_PASSWORD_CONFIG));
      props.put(SslConfigs.SSL_ENDPOINT_IDENTIFICATION_ALGORITHM_CONFIG,kafkaProperties.getProperty(SslConfigs.SSL_ENDPOINT_IDENTIFICATION_ALGORITHM_CONFIG));
      // Set the method for serializing Kafka 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);
      // If `ack` is 0, the producer will not wait for acknowledgment from the broker, and the retry configuration will not take effect. Note that if traffic throttling is triggered, the connection will be closed.
      // If `ack` is 1, the broker leader will directly return `ack` without waiting for acknowledgment from all broker followers.
      // If `ack` is `all`, the broker leader will return `ack` only after receiving acknowledgment from all broker followers.
      props.put(ProducerConfig.ACKS_CONFIG, "all");
      // Construct a producer object. Note: 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 {
         // Batch getting future objects can speed up the process. Note that the batch size should not be too large.
         List<Future<RecordMetadata>> futures = new ArrayList<>(128);
         for (int i = 0; i < 100; i++) {
            // Send the message and get 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 client internal retries, 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 KafkaSaslConsumerDemo {
   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. Get the access point of the corresponding topic in the console.
      props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG,
              kafkaProperties.getProperty("bootstrap.servers"));
      //
      // Use SASL_SSL for public network access.
      //
      // Set the access protocol.
      props.put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG, "SASL_SSL");
      // Use Plain mode for SASL.
      props.put(SaslConfigs.SASL_MECHANISM, "PLAIN");
      // Set SSL encryption.
      props.put(SslConfigs.SSL_TRUSTSTORE_LOCATION_CONFIG, kafkaProperties.getProperty(SslConfigs.SSL_TRUSTSTORE_LOCATION_CONFIG));
      props.put(SslConfigs.SSL_TRUSTSTORE_PASSWORD_CONFIG, kafkaProperties.getProperty(SslConfigs.SSL_TRUSTSTORE_PASSWORD_CONFIG));
      props.put(SslConfigs.SSL_ENDPOINT_IDENTIFICATION_ALGORITHM_CONFIG,kafkaProperties.getProperty(SslConfigs.SSL_ENDPOINT_IDENTIFICATION_ALGORITHM_CONFIG));
      // Set the consumer timeout period.
      // 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 time interval between two polls.
      // Before v0.10.1.0, these two concepts were mixed and both represented by `session.timeout.ms`.
      props.put(ConsumerConfig.MAX_POLL_INTERVAL_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 for 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 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