java 代码连不上kafka_Java操作Kafka执行不成功

r囧r小猫 2022-11-10 01:15 197阅读 0赞

使用kafka-clients操作kafka始终不成功，原因不清楚，下面贴出相关代码及配置，请懂得指点一下，谢谢!

环境及依赖

org.apache.kafka

kafka-clients

0.10.2.0

JDK版本为1.8、Kafka版本为2.12-0.10.2.0，服务器使用CentOS-7构建。

测试代码

TestBase.java

public class TestBase \{

protected Logger log = LoggerFactory.getLogger(this.getClass());

protected String kafka\_server = "192.168.60.160:9092" ;

protected String topic = "zlikun\_topic";

ProducerTest.java

public class ProducerTest extends TestBase \{

protected Properties props = new Properties();

@Before

public void init() \{

props.put(ProducerConfig.BOOTSTRAP\_SERVERS\_CONFIG, kafka\_server);

props.put(ProducerConfig.ACKS\_CONFIG, "all");

props.put(ProducerConfig.RETRIES\_CONFIG, 0);

props.put(ProducerConfig.BATCH\_SIZE\_CONFIG, 16384);

props.put(ProducerConfig.LINGER\_MS\_CONFIG, 1);

props.put(ProducerConfig.BUFFER\_MEMORY\_CONFIG, 33554432);

props.put(ProducerConfig.KEY\_SERIALIZER\_CLASS\_CONFIG, StringSerializer.class);

props.put(ProducerConfig.VALUE\_SERIALIZER\_CLASS\_CONFIG, StringSerializer.class);

props.put(ProducerConfig.PARTITIONER\_CLASS\_CONFIG ,MyPartitioner.class) ;

@Test

public void test() throws InterruptedException \{

KafkaProducer producer = new KafkaProducer<>(props);

// 发送消息

for (int i = 0; i < 10; i++) \{

producer.send(new ProducerRecord(topic, Integer.toString(i), Integer.toString(i)), new Callback() \{

@Override

public void onCompletion(RecordMetadata recordMetadata, Exception e) \{

if (e == null) \{

System.out.printf("offset = %d ,partition = %d \\n", recordMetadata.offset() ,recordMetadata.partition());

\} else \{

log.error("send error !" ,e);

\});

TimeUnit.SECONDS.sleep(3);

producer.close();

ConsumerTest.java

public class ConsumerTest extends TestBase \{

private Properties props = new Properties();

@Before

public void init() \{

props.put(ConsumerConfig.BOOTSTRAP\_SERVERS\_CONFIG, kafka\_server);

props.put(ConsumerConfig.GROUP\_ID\_CONFIG ,"zlikun") ;

props.put(ConsumerConfig.ENABLE\_AUTO\_COMMIT\_CONFIG, "true");

props.put(ConsumerConfig.AUTO\_COMMIT\_INTERVAL\_MS\_CONFIG, "1000");

props.put(ConsumerConfig.KEY\_DESERIALIZER\_CLASS\_CONFIG, StringDeserializer.class);

props.put(ConsumerConfig.VALUE\_DESERIALIZER\_CLASS\_CONFIG, StringDeserializer.class);

@Test

public void test() \{

Consumer consumer = new KafkaConsumer<>(props);

consumer.subscribe(Arrays.asList(topic));

// consumer.assign(Arrays.asList(new TopicPartition(topic, 1)));

while (true) \{

ConsumerRecords records = consumer.poll(100);

for (ConsumerRecord record : records) \{

System.out.printf("offset = %d, key = %s, value = %s%n", record.offset(), record.key(), record.value());

问题

\# 测试topic为手动创建

$ bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 4 --topic zlikun\_topic

控制台输出信息