kafka客户端调用

springboot整合kafka

• 手动提交需要在配置文件配置kafka属性 kafka.listener.ack-mode: manual

  
  @Component
  public class MyKafkaListener {
  
      @Autowired
      private SaslClient saslClient;
      //监听所有分区
      @KafkaListener(topics ={ "主题" },groupId = "消费组")
      //监听指定分区
  //    @KafkaListener(
  //            topicPartitions ={
  //                    @TopicPartition(topic = "主题"
              partitionOffsets = {
                      @PartitionOffset(partition = "3", initialOffset = "323"),
                      @PartitionOffset(partition = "4", initialOffset = "6629")
              }
  //   ) },groupId = "消费组")
      public void onMessage(ConsumerRecord<String, String> record, Acknowledgment  ack) {
  
          try {
              saslClient.consume(record);
          } catch (Exception e) {
              e.printStackTrace();
          } finally{
            ack.acknowledge();//手动提交 
          }
      }
  
  }
  

• yml增加配置

  kafka:
    listener:
      ack-mode: manual # 配置手动提交
    bootstrap-servers: # 服务组
    consumer:
      isolation-level: read-committed
      enable-auto-commit: false #关闭自动提交
      #auto-commit-interval: 1000
      auto-offset-reset: earliest #当各分区下无初始偏移量或偏移量不再可用时，从最早的消息记录开始读取
      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      max-poll-records: 2
    properties:
       #安全认证
      security:
        protocol: SASL_PLAINTEXT
      sasl:
        mechanism: SCRAM-SHA-512
        jaas:
          config: org.apache.kafka.common.security.scram.ScramLoginModule required username="用户" password="密码";  
      session:
        timeout:
          ms: 24000
      max:
        poll:
          interval:
            ms: 30000
  

java调用kafka

  //主题
    @Value("${kafakaData.topic}")
    private String topic;

    //消费
    @Value("${kafkaData.group}")
    private String group;

    @Value("${kafkaData.jaas}")
    private String jaas;

    @Value("${kafkaData.key}")
    private String key;

    @Value("${kafkaData.brokers}")
    private String brokers; //需使用安全接入点的地址

    public void consume() throws Exception {
        Properties properties = new Properties();
        properties.put("security.protocol", "SASL_PLAINTEXT");
        properties.put("sasl.mechanism", "SCRAM-SHA-512");
        properties.put("bootstrap.servers", brokers);
        properties.put("group.id", group);
        properties.put("enable.auto.commit", "false");
        properties.put("auto.offset.reset", "earliest");
        properties.put("max.poll.records", 2); //每次poll的最大数量
        properties.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put("sasl.jaas.config", jaas);

        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(properties);
        // 重置消费者的偏移量到最早的偏移量
        consumer.subscribe(Arrays.asList(topic));
        while (true) {
            ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(3000));//deprecated
            System.out.printf("poll records size = %d%n", records.count());
            try{
                for (ConsumerRecord<String, String> record : records) {
                    //对加密数据解密
                    String publicDecrypt = RSAUtil.publicDecrypt(record.value(), RSAUtil.getPublicKey(key));
                    JSONObject jsonObject = JSONObject.parseObject(publicDecrypt);
                    String msg = jsonObject.getString("msg");
                    String page = jsonObject.getString("page");
                    String size = jsonObject.getString("size");
                    String time = jsonObject.getString("time");
                    String total = jsonObject.getString("total");
                    String type = jsonObject.getString("type");
                    String operation = jsonObject.getString("operation");
                    //todo 业务处理
                }

            }catch (Exception e){
                e.printStackTrace();
            }finally {
                consumer.commitAsync();//手动提交
            }
        }
    }

其他问题

• 每次消费一条数据必须提交，否则会影响分区，导致偏移量错位，后面就消费不到数据了

原文地址：https://blog.csdn.net/weixin_45569664/article/details/144425177

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