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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 {@Autowiredprivate 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-committedenable-auto-commit: false #关闭自动提交#auto-commit-interval: 1000auto-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.StringDeserializervalue-deserializer: org.apache.kafka.common.serialization.StringDeserializermax-poll-records: 2properties:#安全认证security:protocol: SASL_PLAINTEXTsasl:mechanism: SCRAM-SHA-512jaas:config: org.apache.kafka.common.security.scram.ScramLoginModule required username="用户" password="密码";  session:timeout:ms: 24000max: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));//deprecatedSystem.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