KafKa Java程式設計例項

KafKa Java程式設計例項

編寫一個能傳送訊息，接收訊息的例項

（1）編寫係數配置：KafkaProperties.java

package com.imooc.spark.kafka;

/**

* Kafka常用配置檔案

*/

public class KafkaProperties {

public static final String ZK = "140.143.236.169:2181"; //此處要和kafka配置檔案中的 advertised.host.name保持一致，要麼都是IP,要麼都是HostName

public static final String TOPIC = "hello_topic";

public static final String BROKER_LIST = "140.143.236.169:9092";

public static final String GROUP_ID = "test_group1";

}

（2）編寫生產者：KafkaProducer.java

package com.imooc.spark.kafka;

import kafka.javaapi.producer.Producer;

import kafka.producer.KeyedMessage;

import kafka.producer.ProducerConfig;

import java.util.Properties;

/**

* Kafka生產者

*/

public class KafkaProducer extends Thread{

private String topic;

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

}

@Override

public void run() {

int messageNo = 1;

while(true) {

String message = "message_" + messageNo;

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

System.out.println("Sent: " + message);

messageNo ++ ;

try{

Thread.sleep(2000);

} catch (Exception e){

e.printStackTrace();

}

（3）編寫消費者：KafkaConsumer.java

package com.imooc.spark.kafka;

import kafka.consumer.Consumer;

import kafka.consumer.ConsumerConfig;

import kafka.consumer.ConsumerIterator;

import kafka.consumer.KafkaStream;

import kafka.javaapi.consumer.ConsumerConnector;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.Properties;

/**

* Kafka消費者

*/

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<String, Integer> topicCountMap = new HashMap<String, Integer>();

topicCountMap.put(topic, 1);

// topicCountMap.put(topic2, 1);

// topicCountMap.put(topic3, 1);

// String: topic

// List<KafkaStream<byte[], byte[]>> 對應的資料流

Map<String, List<KafkaStream<byte[], byte[]>>> messageStream = consumer.createMessageStreams(topicCountMap);

KafkaStream<byte[], byte[]> stream = messageStream.get(topic).get(0); //獲取我們每次接收到的暑假

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

while (iterator.hasNext()) {

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

System.out.println("rec: " + message);

}

（4）編寫啟動例項：KafkaClientApp.java

package com.imooc.spark.kafka;

/**

* Kafka Java API測試

*/

public class KafkaClientApp {

public static void main(String[] args) {

new KafkaProducer(KafkaProperties.TOPIC).start();

new KafkaConsumer(KafkaProperties.TOPIC).start();

}

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

<groupId>com.imooc.spark</groupId>

<artifactId>sparktrain</artifactId>

<scala.version>2.11.8</scala.version>

<kafka.version>0.9.0.0</kafka.version>

<spark.version>2.2.0</spark.version>

<hadoop.version>2.6.0-cdh5.7.0</hadoop.version>

<hbase.version>1.2.0-cdh5.7.0</hbase.version>

</properties>

<id>cloudera</id>

<url>https://repository.cloudera.com/artifactory/cloudera-repos</url>

</repository>

</repositories>

<groupId>org.scala-lang</groupId>

<artifactId>scala-library</artifactId>

<version>${scala.version}</version>

</dependency>

<!--

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

<artifactId>kafka_2.11</artifactId>

<version>${kafka.version}</version>

</dependency>

-->

<groupId>org.apache.hadoop</groupId>

<artifactId>hadoop-client</artifactId>

<version>${hadoop.version}</version>

</dependency>

<groupId>org.apache.hbase</groupId>

<artifactId>hbase-client</artifactId>

<version>${hbase.version}</version>

</dependency>

<groupId>org.apache.hbase</groupId>

<artifactId>hbase-server</artifactId>

<version>${hbase.version}</version>

</dependency>

<groupId>org.apache.spark</groupId>

<artifactId>spark-streaming_2.11</artifactId>

<version>${spark.version}</version>

</dependency>

<groupId>org.apache.spark</groupId>

<artifactId>spark-streaming-flume_2.11</artifactId>

<version>${spark.version}</version>

</dependency>

<groupId>org.apache.spark</groupId>

<artifactId>spark-streaming-flume-sink_2.11</artifactId>

<version>${spark.version}</version>

</dependency>

<groupId>org.apache.spark</groupId>

<artifactId>spark-streaming-kafka-0-8_2.11</artifactId>

<version>${spark.version}</version>

</dependency>

<groupId>org.apache.commons</groupId>

<artifactId>commons-lang3</artifactId>

</dependency>

<groupId>org.apache.spark</groupId>

<artifactId>spark-sql_2.11</artifactId>

<version>${spark.version}</version>

</dependency>

<groupId>com.fasterxml.jackson.module</groupId>

<artifactId>jackson-module-scala_2.11</artifactId>

</dependency>

<groupId>net.jpountz.lz4</groupId>

</dependency>

<groupId>mysql</groupId>

<artifactId>mysql-connector-java</artifactId>

</dependency>

<groupId>org.apache.flume.flume-ng-clients</groupId>

<artifactId>flume-ng-log4jappender</artifactId>

</dependency>

</dependencies>

<build>

<sourceDirectory>src/main/scala</sourceDirectory>

<testSourceDirectory>src/test/scala</testSourceDirectory>

<groupId>org.scala-tools</groupId>

<artifactId>maven-scala-plugin</artifactId>

<goals>

<goal>compile</goal>

<goal>testCompile</goal>

</goals>

</execution>

</executions>

<scalaVersion>${scala.version}</scalaVersion>

<args>

<arg>-target:jvm-1.5</arg>

</args>

</configuration>

</plugin>

<groupId>org.apache.maven.plugins</groupId>

<artifactId>maven-eclipse-plugin</artifactId>

<buildcommand>ch.epfl.lamp.sdt.core.scalabuilder</buildcommand>

</buildcommands>

<projectnature>ch.epfl.lamp.sdt.core.scalanature</projectnature>

</additionalProjectnatures>

<classpathContainer>org.eclipse.jdt.launching.JRE_CONTAINER</classpathContainer>

<classpathContainer>ch.epfl.lamp.sdt.launching.SCALA_CONTAINER</classpathContainer>

</classpathContainers>

</configuration>

</plugin>

</plugins>

</build>

<groupId>org.scala-tools</groupId>

<artifactId>maven-scala-plugin</artifactId>

<scalaVersion>${scala.version}</scalaVersion>

</configuration>

</plugin>

</plugins>

</reporting>

</project>

KafKa Java程式設計例項

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