如何在apache kafka中获取所有主题？

Question

    @RequestMapping(value = "/getTopics",method = RequestMethod.GET)
    @ResponseBody
    public Response getAllTopics() {
        ZkClient zkClient = new ZkClient(ZookeeperProps.zookeeperURL, ZookeeperProps.connectionTimeoutMs,
                ZookeeperProps.sessionTimeoutMs, ZKStringSerializer$.MODULE$);
        Seq<String> topics = ZkUtils.getAllTopics(zkClient);
        scala.collection.Iterator<String> topicIterator = topics.iterator();
        String allTopics = "";
        while(topicIterator.hasNext()) {
            allTopics+=topicIterator.next();
            allTopics+="\n";
        }

        Response response = new Response();
        response.setResponseMessage(allTopics);
        return response;

    }

我是apache kafka的新手.现在有一天试图用zookeeper了解卡夫卡.我想获取与zookeeper相关的主题.所以我正在尝试跟踪事情
:)首先我做了一个zookeeper客户端,如下所示:

ZkClient(ZookeeperProps.zookeeperURL, ZookeeperProps.connectionTimeoutMs, ZookeeperProps.sessionTimeoutMs, ZKStringSerializer$.MODULE$);
Seq<String> topics = ZkUtils.getAllTopics(zkClient);

但是在使用Java代码执行时主题是空白的.我没有得到这里的问题.我的Zookeeper道具如下:String zkConnect ="127.0.0.1:2181"; 动物园管理员跑得很好.
请帮帮我们

Answer 1

这很简单.(我的例子是用Java编写的,但在Scala中它几乎是一样的.)

import java.util.List;

import org.apache.zookeeper.ZooKeeper;

public class KafkaTopicListFetcher {

    public static void main(String[] args) throws Exception {
        ZooKeeper zk = new ZooKeeper("localhost:2181", 10000, null);
        List<String> topics = zk.getChildren("/brokers/topics", false);
        for (String topic : topics) {
            System.out.println(topic);
        }
    }
}

我有三个主题的结果:test,test2和test 3

test
test2
test3

下面的图片是我为自己的博客发布的内容.当您了解Kafka使用的ZooKeeper树的结构时,它会很有帮助.(这里看起来很小.请在新标签页中打开图片并放大.)