kafka 简单 java 生产消费API 1.1

1. KafkaProperties

package com.immooc.spark.kafka;

public class KafkaProperties {

    public static final  String ZK = "localhost:2181";
    public static final String TOPIC = "test";
    public static final String BROKER_LIST = "localhost:9092";
    public static final String GROUP_ID = "test_group1";
}

2. KafkaProducerTest

package com.immooc.spark.kafka;



import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;


import java.util.Properties;

import static org.apache.kafka.clients.producer.ProducerConfig.*;


public class KafkaProducerTest extends Thread{



    private String topic;
    private KafkaProducer<Integer, String> producer;
    public  KafkaProducerTest(String topic){
        this.topic = topic;

        Properties properties = new Properties();
        properties.put(BOOTSTRAP_SERVERS_CONFIG, KafkaProperties.BROKER_LIST);
        properties.put(KEY_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
        properties.put(VALUE_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
        properties.put(ACKS_CONFIG, "1");
        properties.put(LINGER_MS_CONFIG, 0);
        properties.put(BATCH_SIZE_CONFIG, 0);

        producer = new KafkaProducer<Integer, String>(properties);
    }

    @Override
    public void run(){
        int messageNo = 1;
        while (true){
            String message = "message_" + messageNo;
            producer.send(new ProducerRecord<Integer, String>(topic, message));
            System.out.println("Send: " + message);

            messageNo ++;
            try{
                Thread.sleep(2000);
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }
}

3. KafkaConsumerTest

package com.immooc.spark.kafka;


import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;

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

import static org.apache.kafka.clients.consumer.ConsumerConfig.*;

public class KafkaConsumerTest extends Thread{

    private String topic;

    public KafkaConsumerTest(String topic){
        this.topic = topic;
    }

    private KafkaConsumer createConsumer(){
        Properties properties = new Properties();
        properties.put(BOOTSTRAP_SERVERS_CONFIG, KafkaProperties.BROKER_LIST);
        properties.put(GROUP_ID_CONFIG, KafkaProperties.GROUP_ID);
        properties.put(ENABLE_AUTO_COMMIT_CONFIG, "true");
        properties.put(AUTO_COMMIT_INTERVAL_MS_CONFIG, "1000");
        properties.put(KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        return new KafkaConsumer(properties);
    }

    @Override
    public void run(){
        KafkaConsumer consumer = createConsumer();
        consumer.subscribe(Arrays.asList(this.topic));
        while (true){
            ConsumerRecords<String, String> records = consumer.poll(100);
            for (ConsumerRecord<String, String> record : records){
                System.out.printf("offset = %d, key = %s, value = %s%n", record.offset(), record.key(), record.value());
            }
        }
    }
}

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