@Component
public class KafkaConfig{

   // 配置Kafka
  public Properties getProps(){
    Properties props = new Properties();
    props.put("bootstrap.servers", "localhost:9092");
/*    props.put("retries", 2); // 重試次數(shù)
    props.put("batch.size", 16384); // 批量發(fā)送大小
    props.put("buffer.memory", 33554432); // 緩存大小，根據(jù)本機(jī)內(nèi)存大小配置
    props.put("linger.ms", 1000); // 發(fā)送頻率，滿足任務(wù)一個(gè)條件發(fā)送*/
    props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
    props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
    return props;
  }

}

@RestController
public class KafkaTopicManager {

  @Autowired
  private KafkaConfig kafkaConfig;

  @GetMapping("createTopic")
  public void createTopic(){
    AdminClient adminClient = KafkaAdminClient.create(kafkaConfig.getProps());

    NewTopic newTopic = new NewTopic("test1",4, (short) 1);
    Collection<NewTopic> newTopicList = new ArrayList<>();
    newTopicList.add(newTopic);
    adminClient.createTopics(newTopicList);

    adminClient.close();
  }
  @GetMapping("deleteTopic")
  public void deleteTopic(){
    AdminClient adminClient = KafkaAdminClient.create(kafkaConfig.getProps());
    adminClient.deleteTopics(Arrays.asList("test1"));
    adminClient.close();
  }
  @GetMapping("listAllTopic")
  public void listAllTopic(){
    AdminClient adminClient = KafkaAdminClient.create(kafkaConfig.getProps());
    ListTopicsResult result = adminClient.listTopics();
    KafkaFuture<Set<String>> names = result.names();
    try {
      names.get().forEach((k)->{
        System.out.println(k);
      });
    } catch (InterruptedException | ExecutionException e) {
      e.printStackTrace();
    }
    adminClient.close();
  }
  @GetMapping("getTopic")
  public void getTopic(){
    AdminClient adminClient = KafkaAdminClient.create(kafkaConfig.getProps());

    DescribeTopicsResult describeTopics = adminClient.describeTopics(Arrays.asList("syn-test"));

    Collection<KafkaFuture<TopicDescription>> values = describeTopics.values().values();

    if(values.isEmpty()){
      System.out.println("找不到描述信息");
    }else{
      for (KafkaFuture<TopicDescription> value : values) {
        System.out.println(value);
      }
    }
    adminClient.close();
  }
}