Kafka客户端操作

引入kafka依赖

         <!--kafka-->
        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>
            <version>1.1.7.RELEASE</version>
        </dependency>  

　　

1、创建Topic

 /**
     * 创建topic实例
     */
    public static  void createTopic() throws Exception{
        AdminClient adminClient = adminClient();
        //副本因子
        Short rs = 1;
        NewTopic newTopic = new NewTopic(TOPIC_NAME,1,rs);
        CreateTopicsResult createTopicsResult =  adminClient.createTopics(Arrays.asList(newTopic));
        System.out.println("createTopicsResult: " + createTopicsResult );
        createTopicsResult.all().get();
    }


    public static AdminClient adminClient(){
        Properties properties = new Properties();
        properties.setProperty(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG,"118.xx.xx.101:9092");

        AdminClient adminClient = AdminClient.create(properties);

        return  adminClient;
    }

　　

2、显示topic列表

 /**
     * 获取Topic列表
     */
    public static  void topicLists() throws Exception{
        AdminClient adminClient = adminClient();
        //是否查看internal选项
        ListTopicsOptions options = new ListTopicsOptions();
        options.listInternal(true);
        ListTopicsResult listTopicsResult = adminClient.listTopics(options);
        Set<String> names  = listTopicsResult.names().get();

        //打印names
        names.stream().forEach(System.out::println);
    }

　　

3、删除Topic

    /**
     * 删除Topic
     */
    public static  void delTopics() throws Exception{
        AdminClient adminClient = adminClient();
        DeleteTopicsResult deleteTopicsResult = adminClient.deleteTopics(Arrays.asList(TOPIC_NAME));
        deleteTopicsResult.all().get();
    }

　　

4、topic描述

    /**
     * 描述Topic
     */
    public static  void describeTopics() throws Exception{
        AdminClient adminClient = adminClient();
        DescribeTopicsResult describeTopicsResult  = adminClient.describeTopics(Arrays.asList(TOPIC_NAME));
        Map<String, TopicDescription> stringTopicDescriptionMap = describeTopicsResult.all().get();
        Set<Map.Entry<String,TopicDescription>> entries = stringTopicDescriptionMap.entrySet();
        entries.stream().forEach((entry) ->{
            System.out.println("name:" + entry.getKey() + ", desc:" + entry.getValue());
        });
    }　

输出结果

name:test5,

desc:(name=test5,

     　　internal=false,

　　　 partitions=

　　　　(partition=0,

　　　　leader=118.xx.xx.101:9092

　　　　(id: 0 rack: null),

　　　　replicas=118.xx.xx.101:9092

　　　　 (id: 0 rack: null),

　　　　isr=118.xx.xx.101:9092

　　　　(id: 0 rack: null)),

　　　　authorizedOperations=null)

5、查看查看Config

    /**
     * 查看Config
     */
    public static  void describeConfig() throws Exception{
        AdminClient adminClient = adminClient();
        ConfigResource configResource = new ConfigResource(ConfigResource.Type.TOPIC, TOPIC_NAME);
        DescribeConfigsResult describeConfigsResult  = adminClient.describeConfigs(Arrays.asList(configResource));
        Map<ConfigResource, Config>  configResourceConfigMap =describeConfigsResult.all().get();
        configResourceConfigMap.entrySet().stream().forEach((entry) -> {
            System.out.println("configResource:" + entry.getKey()  + ",Config: " + entry.getValue());
        });

    }

　　

6、修改Config

 /**
     * 修改Config
     */
    public static  void alertConfig() throws Exception{
        AdminClient adminClient = adminClient();
        Map<ConfigResource,Config> configMap = new HashMap<>();
        ConfigResource configResource = new ConfigResource(ConfigResource.Type.TOPIC, TOPIC_NAME);
        Config config = new Config(Arrays.asList(new ConfigEntry("preallocate","false")));
        configMap.put(configResource, config);

        AlterConfigsResult alterConfigsResult  = adminClient.alterConfigs(configMap);
        alterConfigsResult.all().get();
    }

　　

7、增加partitions数量

  /**
     * 增加partitions数量
     */
    public static  void incrPartitions(int partitions) throws Exception{
        AdminClient adminClient = adminClient();
        Map<String,NewPartitions> partitionsMap = new HashMap<>();
        NewPartitions newPartitions = NewPartitions.increaseTo(partitions);
        partitionsMap.put(TOPIC_NAME, newPartitions);
        CreatePartitionsResult createPartitionsResult =  adminClient.createPartitions(partitionsMap);
        createPartitionsResult.all().get();
    }