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配置信息

配置信息，更多详情配置以及说明查看AdminClientConfig

public static Properties getKafkaConfig(){
        Properties properties = new Properties();
        //Kafka服务器地址
        properties.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG,brokerList);
        //当前客户端ID
        properties.put(AdminClientConfig.CLIENT_ID_CONFIG,"admin topic");
        return properties;
    }
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创建主题

创建主题示例代码
需要指定主题名称、分区数量、副本数量

 //创建主题
public static void createTopic(){
    AdminClient client = KafkaAdminClient.create(getKafkaConfig());
    //主题名称
    String  topName = "test-topic";
    //分区数量
    int numPartitions = 1;
    //副本数量
    short replicationFactor = 1;
    NewTopic topic = new NewTopic(topName,numPartitions,replicationFactor);
    //创建主题
    CreateTopicsResult clientTopics = client.createTopics(Collections.singleton(topic));
    Iterator<Map.Entry<String, KafkaFuture<Void>>> createIterator = clientTopics.values().entrySet().iterator();
    while (createIterator.hasNext()){
        Map.Entry<String,KafkaFuture<Void>>  entry =createIterator.next();
        log.info(entry.getKey());
    }
}
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删除主题

代码如下（示例）：

public static void deleteTopic(){
    AdminClient client = KafkaAdminClient.create(getKafkaConfig());
    //主题名称
    String  topName = "test-topic";
    //删除主题
    DeleteTopicsResult deleteTopicsResult = client.deleteTopics(Collections.singleton(topName));

    Iterator<Map.Entry<String, KafkaFuture<Void>>> deleteIterator = deleteTopicsResult.values().entrySet().iterator();
    while (deleteIterator.hasNext()){
        Map.Entry<String,KafkaFuture<Void>>  entry =deleteIterator.next();
        log.info(entry.getKey());
    }
}
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查看所有主题名称

查询所有主题名称

 public static void listTopics() throws Exception{
    AdminClient client = KafkaAdminClient.create(getKafkaConfig());
    //查看所有主题
    ListTopicsResult listTopicsResult = client.listTopics();
    KafkaFuture<Set<String>> listFuture = listTopicsResult.names();
    Iterator<String> iterator = listFuture.get().iterator();
    while (iterator.hasNext()){
        log.info("主题名称：{}",iterator.next());
    }
}
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查看某个主题详细信息

通过主题名称，去查看某个主题的详细信息，包含分区，副本，存活副本等信息
主题名称可以通过查看所有主题名称获得，或是自己指定主题名称

public static void describeTopics() throws Exception{
    AdminClient client = KafkaAdminClient.create(getKafkaConfig());
    //主题名称
    String  topName = "test-topic";
    //查看主题详细信息
    DescribeTopicsResult describeTopicsResult = client.describeTopics(Collections.singleton(topName));

    Iterator<Map.Entry<String,KafkaFuture<TopicDescription>>> describeIterator = describeTopicsResult.values().entrySet().iterator();

    while (describeIterator.hasNext()){
        Map.Entry<String,KafkaFuture<TopicDescription>> entry = describeIterator.next();
        log.info(entry.getKey());
        TopicDescription description = entry.getValue().get();
        log.info("主题名称： {}",description.name());
        List<TopicPartitionInfo> partitionInfos = description.partitions();
        for(TopicPartitionInfo info : partitionInfos){
            log.info("分区位置：{}",info.partition());
            log.info("分区主节点信息:{}",info.leader());
            log.info("分区副本节点信息:{}",info.replicas());
            log.info("分区存活节点信息:{}",info.isr());
         }
    }
}
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删除消息记录

删除指定分区，偏移量之前的数据，并返回低水平位值
低水平位：能消费的最大offset值

public static void deleteRecords() throws Exception{    
    AdminClient client = KafkaAdminClient.create(getKafkaConfig());
 
    Map<TopicPartition, RecordsToDelete> deleteMap = new HashMap<>();
    //指定分区
    int partition = 2;
    //主题
    String  topName = "test-topic";
    TopicPartition topicPartition = new TopicPartition(topName,partition);
    //消息偏移量
    int offset = 5;
    //删除偏移量之前的数据
    RecordsToDelete recordsToDelete = RecordsToDelete.beforeOffset(offset);

    deleteMap.put(topicPartition,recordsToDelete);
    DeleteRecordsResult result =  client.deleteRecords(deleteMap);
    //低水平位，消息的offset
    Iterator<Map.Entry<TopicPartition,KafkaFuture<DeletedRecords>>> iterator = result.lowWatermarks().entrySet().iterator();
        
    while (iterator.hasNext()){
        DeletedRecords records = iterator.next().getValue().get();
        log.info("低水平位：lowWatermark = {}"+records.lowWatermark());
    }
        
}
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