Kafka之生产者消费者示例

àì夳堔傛蜴生んèń 2022-10-02 15:55 218阅读 0赞

**本例以kafka2.10\_0.10.0.0为例，不同版本的kafka Java api有些区别!**

增加maven依赖

<dependency>  
        <groupId>org.apache.kafka</groupId>  
        <artifactId>kafka_2.10</artifactId>  
        <version>0.10.0.0</version>  
    </dependency>

生产者

package com.zns.kafka;
    
    import java.util.Properties;
    import org.apache.kafka.clients.producer.KafkaProducer;
    import org.apache.kafka.clients.producer.ProducerConfig;
    import org.apache.kafka.clients.producer.ProducerRecord;
    import org.apache.kafka.common.serialization.StringSerializer;
    
    public class KafkaProducerTest {
        public static String topicName = "test";
    
        public static void main(String[] args) {
            Properties props = new Properties();
            props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "127.0.0.1:9092");// 9092是kafka默认端口
            props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
            props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
    
            KafkaProducer<String, String> producer = new KafkaProducer<String, String>(props);
            for (int i = 1; i <= 10; i++) {
                ProducerRecord<String, String> message = new ProducerRecord<String, String>(topicName, "hello world " + i);
                producer.send(message);
                producer.flush();
            }
        }
    }

消费者

package com.zns.kafka;
    
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    import java.util.Properties;
    import org.apache.kafka.clients.producer.ProducerConfig;
    import org.apache.kafka.common.serialization.StringSerializer;
    import kafka.consumer.ConsumerConfig;
    import kafka.consumer.ConsumerIterator;
    import kafka.consumer.KafkaStream;
    import kafka.javaapi.consumer.ConsumerConnector;
    import kafka.serializer.StringDecoder;
    import kafka.utils.VerifiableProperties;
    
    public class KafkaConsumerTest {
        public static String topicName = "test";
    
        public static void main(String[] args) {
            Properties props = new Properties();
            props.put("zookeeper.connect", "127.0.0.1:2181");// 2181是zookeeper默认端口
            props.put("group.id", "test-group");
            props.put("zookeeper.session.timeout.ms", "100000");
            props.put("zookeeper.sync.time.ms", "200");
            props.put("auto.commit.interval.ms", "1000");
            props.put("auto.offset.reset", "smallest");
            props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
            props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
    
            ConsumerConfig config = new ConsumerConfig(props);
            ConsumerConnector consumer = kafka.consumer.Consumer.createJavaConsumerConnector(config);
    
            Map<String, Integer> topicCountMap = new HashMap<String, Integer>();
            topicCountMap.put(topicName, new Integer(1));
            StringDecoder keyDecoder = new StringDecoder(new VerifiableProperties());
            StringDecoder valueDecoder = new StringDecoder(new VerifiableProperties());
    
            Map<String, List<KafkaStream<String, String>>> consumerMap = consumer.createMessageStreams(topicCountMap,
                    keyDecoder, valueDecoder);
            KafkaStream<String, String> stream = consumerMap.get(topicName).get(0);
            ConsumerIterator<String, String> it = stream.iterator();
            while (it.hasNext()) {
                System.out.println("收到消息：" + it.next().message());
            }
        }
    }

确保启动运行了zookeeper和kafka

先后启动运行生产者和消费者，可以看到消费者端接收到了消息...

转载于:https://www.cnblogs.com/zengnansheng/p/10389745.html