kafka_代码中使用

冷不防 2022-05-24 03:29 146阅读 0赞

创建mave工程：maven-kafka

添加包依赖：

<groupId>org.apache.kafka</groupId>

<artifactId>kafka\_2.11</artifactId>

</dependency>

1. 生产者

**package** com.gary.kafka;

**import** java.util.Properties;

**import** java.util.concurrent.TimeUnit;

**import** joptsimple.internal.Strings;

**import** kafka.javaapi.producer.Producer;

**import** kafka.producer.KeyedMessage;

**import** kafka.producer.ProducerConfig;

**import** kafka.serializer.StringEncoder;

@SuppressWarnings("deprecation")

**public** **class** KafkaProducer **extends** Thread\{

**private** String topic;

**private** Producer producer;

**private** String message;

**public** KafkaProducer(String topic)\{

**this**.topic = topic;

producer = createProducer();

**public** **void** setMessage(String message) \{

**this**.message = message;

**private** Producer createProducer()\{

Properties properties = **new** Properties();

// 声明zk

properties.put("zookeeper.connect", "192.168.75.101:2181");

// 声明序列化类

properties.put("serializer.class", StringEncoder.**class**.getName());

// 声明kafka broker

properties.put("metadata.broker.list", "192.168.75.101:9093");

**return** **new** Producer<Integer, String>(**new** ProducerConfig(properties));

@Override

**public** **void** run() \{

**if** (!Strings.*isNullOrEmpty*(message))\{

producer.send(**new** KeyedMessage<Integer, String>(topic, message));

**public** **static** **void** main(String\[\] args)\{

String\[\] str = \{ "zhangsan","lisi","wangwu","zhaoliu","sunqi"\};

**for** (**int** i = 0; i < str.length; i\++) \{

KafkaProducer producer = **new** KafkaProducer("kafkademo");

producer.setMessage(str\[i\]);

producer.start();

**try** \{

TimeUnit.***SECONDS***.sleep(1);

\} **catch** (InterruptedException e) \{

e.printStackTrace();

2. 消费者

**package** com.gary.kafka;

**import** java.util.HashMap;

**import** java.util.List;

**import** java.util.Map;

**import** java.util.Properties;

**import** kafka.consumer.Consumer;

**import** kafka.consumer.ConsumerConfig;

**import** kafka.consumer.ConsumerIterator;

**import** kafka.consumer.KafkaStream;

**import** kafka.javaapi.consumer.ConsumerConnector;

**public** **class** KafkaConsumer **extends** Thread\{

**private** **int** threadNumber;

**private** KafkaStream<**byte**\[\], **byte**\[\]> stream;

**public** KafkaConsumer(KafkaStream<**byte**\[\], **byte**\[\]> stream, **int** threadNumber) \{

**this**.stream = stream;

**this**.threadNumber = threadNumber;

@Override

**public** **void** run() \{

System.***out***.println("-------thread:" + threadNumber + "----run-----");

ConsumerIterator<**byte**\[\], **byte**\[\]> iterator = stream.iterator();

**while**(iterator.hasNext())\{

String message = **new** String(iterator.next().message());

System.***out***.println("threadNumber:" + threadNumber + " 接收到:"\+ message);

**static** **public** ConsumerConnector createConsumer()\{

Properties properties = **new** Properties();

properties.put("zookeeper.connect", "192.168.75.101:2181");

properties.put("group.id", "group");

properties.put("zookeeper.session.timeout.ms", "40000");// 如果其超时，将会可能触发rebalance并认为已经死去

properties.put("zookeeper.sync.time.ms", "200");// zk follower落后leader的时间

properties.put("auto.commit.interval.ms", "1000");// 自动提交offset到zookeeper的时间间隔

**return** (ConsumerConnector) Consumer.*createJavaConsumerConnector*(**new** ConsumerConfig(properties));

**public** **static** **void** main(String\[\] args)\{

String topic = "kafkademo";

ConsumerConnector consumer = KafkaConsumer.*createConsumer*();

Map<String, Integer> topicMap = **new** HashMap<String, Integer>();

topicMap.put(topic, 2);// 可以启动多个线程一起来消化同一个topic

Map<String, List<KafkaStream<**byte**\[\], **byte**\[\]>>> messageSteams = consumer.createMessageStreams(topicMap);

List<KafkaStream<**byte**\[\], **byte**\[\]>> streams = messageSteams.get(topic);

**int** threadNumber = 0;

**for** (**final** KafkaStream stream : streams) \{

KafkaConsumer kafkaConsumer = **new** KafkaConsumer(stream, threadNumber);

kafkaConsumer.start();

threadNumber\++;

kafka_代码中使用

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