kafka java api编程

1）创建kafka的topic（fyy_topic）

/home/opt/kafka_2.11-0.10.2.2/bin/kafka-topics.sh --create --zookeeper 01.server.bd:2181,02.server.bd:2181,03.server.bd:2181 --replication-factor 3 --partitions 3 --topic fyy_topic

2）查看topic的信息

/home/opt/kafka_2.11-0.10.2.2/bin/kafka-topics.sh --describe --zookeeper 01.server.bd:2181,02.server.bd:2181,03.server.bd:2181 --topic fyy_topic

3）kafka生产者

(1)创建kafka常用配置文件（KafkaProperties.java）

package com.fyy.spark.kafka;

/**
 * @author fanyanyan
 * @Title: KafkaProperties
 * @ProjectName SparkStreamingProject
 */
/**
 * Kafka常用配置文件
 */
public class KafkaProperties {

    public static final String ZK = "01.server.bd:2181,02.server.bd:2181,03.server.bd:2181";

    public static final String TOPIC = "fyy_topic";

    public static final String BROKER_LIST = "01.server.bd:9092,02.server.bd:9092,03.server.bd:9092";

    public static final String GROUP_ID = "fyy_group1";

}

(2)创建kafka消费者（KafkaProducer.java）

package com.fyy.spark.kafka;

/**
 * @author fanyanyan
 * @Title: KafkaProducer
 * @ProjectName SparkStreamingProject
 */

import kafka.javaapi.producer.Producer;
import kafka.producer.KeyedMessage;
import kafka.producer.ProducerConfig;

import java.util.Properties;

/**
 * Kafka生产者
 */
public class KafkaProducer extends Thread{

    private String topic;

    private Producer producer;

    public KafkaProducer(String topic) {
        this.topic = topic;

        Properties properties = new Properties();

        properties.put("metadata.broker.list",KafkaProperties.BROKER_LIST);
        properties.put("serializer.class","kafka.serializer.StringEncoder");
        properties.put("request.required.acks","1");

        producer = new Producer(new ProducerConfig(properties));
    }


    @Override
    public void run() {

        int messageNo = 1;

        // 循环产生数据流
        while(true) {
            String message = "fyy_message_" + messageNo;
            producer.send(new KeyedMessage(topic, message));
            System.out.println("Sent: " + message);

            messageNo ++ ;

            try{
                Thread.sleep(1000);
            } catch (Exception e){
                e.printStackTrace();
            }
        }

    }
}

(3)创建消费者（KafkaConsumer.java）

package com.fyy.spark.kafka;

/**
 * @author fanyanyan
 * @Title: KafkaConsumer
 * @ProjectName SparkStreamingProject
 */

import kafka.consumer.Consumer;
import kafka.consumer.ConsumerConfig;
import kafka.consumer.ConsumerIterator;
import kafka.javaapi.consumer.ConsumerConnector;
import kafka.consumer.KafkaStream;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

/**
 * Kafka消费者
 */

public class KafkaConsumer extends Thread{
    private String topic;
    public KafkaConsumer(String topic){
        this.topic = topic;
    }

    private ConsumerConnector createConnector(){
        Properties properties = new Properties();
        properties.put("zookeeper.connect", KafkaProperties.ZK);
        properties.put("group.id",KafkaProperties.GROUP_ID);
        return Consumer.createJavaConsumerConnector(new ConsumerConfig(properties));
    }

    @Override
    public void run() {
        ConsumerConnector consumer = createConnector();

        Map topicCountMap = new HashMap();
        topicCountMap.put(topic, 1);

        Map>> messageStream = consumer.createMessageStreams(topicCountMap);

        KafkaStream stream = messageStream.get(topic).get(0);

        // 获取每次接收到的数据
        ConsumerIterator iterator = stream.iterator();

        while (iterator.hasNext()){
            String message = new String(iterator.next().message());
            System.out.println("rec: " + message);
        }
    }
}

(4)执行入口程序（KafkaTestApp.java）

package com.fyy.spark.kafka;

import com.fyy.spark.kafka.KafkaConsumer;

/**
 * @author fanyanyan
 * @Title: KafkaTesttApp
 * @ProjectName SparkStreamingProject
 */
/**
 * Kafka Java API测试
 */
public class KafkaTesttApp {

    public static void main(String[] args) {
        // 生产者
        new KafkaProducer(KafkaProperties.TOPIC).start();

        // 消费者
        new KafkaConsumer(KafkaProperties.TOPIC).start();

    }
}

执行效果如下：

4）补充一下kafka的常用的命令行操作

# 查看topic信息
/home/opt/kafka_2.11-0.10.2.2/bin/kafka-topics.sh --list --zookeeper 01.server.bd:2181,02.server.bd:2181,03.server.bd:2181

# 创建topic
/home/opt/kafka_2.11-0.10.2.2/bin/kafka-topics.sh --create --zookeeper 01.server.bd:2181,02.server.bd:2181,03.server.bd:2181 --replication-factor 3 --partitions 3 --topic fyy_topic

# 删除topic
server.properties 设置 delete.topic.enable=true
/home/opt/kafka_2.11-0.10.2.2/bin/kafka-topics.sh --delete --zookeeper 01.server.bd:2181,02.server.bd:2181,03.server.bd:2181 --topic fyy_topic

# 往Kafka的topic中写入数据(命令行的生成者)
/home/opt/kafka_2.11-0.10.2.2/bin/kafka-console-producer.sh --broker-list 01.server.bd:9092,02.server.bd:9092,03.server.bd:9092 --topic fyy_topic

#启动消费者
/home/opt/kafka_2.11-0.10.2.2/bin/kafka-console-consumer.sh --zookeeper 01.server.bd:2181,02.server.bd:2181,03.server.bd:2181 --topic fyy_topic--from-beginning

# 查看kafka的描述信息
 /home/opt/kafka_2.11-0.10.2.2/bin/kafka-topics.sh --describe --zookeeper 01.server.bd:2181,02.server.bd:2181,03.server.bd:2181 --topic fyy_topic