kafka demo最简单的实现

kafka demo最简单的实现

kafka demo最简单的实现

• • 包的结构
  • pom.xml相关的依赖：
  • Producer类：
  • Consumer类
  • 运行结果

包的结构

pom.xml相关的依赖：

  
        
            org.apache.kafka
            kafka-clients
            2.0.0
        
    

Producer类：

package com;

import org.apache.kafka.clients.producer.*;
import org.apache.kafka.common.serialization.StringSerializer;

import java.util.Properties;
import java.util.concurrent.ExecutionException;


public class Producer {

    private static final String TOPIC="demo";
    private static final String BPOKER_LIST="localhost:9092";
    private static KafkaProducer producer=null;
    static {
        Properties configs=initConfig();
        producer=new KafkaProducer(configs);
    }

    private static Properties initConfig() {
        Properties properties=new Properties();
        properties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG,BPOKER_LIST);
        properties.put(ProducerConfig.ACKS_CONFIG,"all");
        properties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
        properties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG,StringSerializer.class.getName());
        return properties;

    }

    public static void main(String[] args) {
        final String message="hello world Modesty";
        ProducerRecord record =new ProducerRecord(TOPIC,message);
        try {
            producer.send(record, new Callback() {
                public void onCompletion(Recordmetadata metadata, Exception exception) {
                    if (null==exception){
                        System.out.println("perfect");
                    }
                    if (null!=metadata){
                        System.out.println("offset:"+metadata.offset()+";partition:"+metadata.partition());
                    }
                }
            }).get();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }finally {
            producer.close();
        }
    }

}

Consumer类

package com;


import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.common.serialization.StringDeserializer;
import org.apache.kafka.common.serialization.StringSerializer;

import java.util.Arrays;
import java.util.Properties;


public class Consumer {
    private static final String TOPIC="demo";
    private static final String BPOKER_LIST="localhost:9092";
    private static KafkaConsumer consumer = null;

    static {
        Properties properties = initConfig();
        consumer = new KafkaConsumer(properties);
        consumer.subscribe(Arrays.asList(TOPIC));
    }

    private static Properties initConfig() {
        Properties properties = new Properties();
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,BPOKER_LIST);
        properties.put(ConsumerConfig.GROUP_ID_CONFIG,"test");
        properties.put(ConsumerConfig.CLIENT_ID_CONFIG,"test");
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,StringDeserializer.class.getName());
        return properties;

    }

    public static void main(String[] args) {
        try {
            while (true) {
                ConsumerRecords records = consumer.poll(100);
                for (ConsumerRecord record : records) {
                    try {
                        System.out.println(record.value());
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            consumer.close();
        }
    }
}

运行结果