我們最常用的或許就是Storm從Kafka中讀取資料轉換成Tuple了，現在我們就將Storm與Kafka來進行整合。
1.pom.xml
<dependency> <groupId>org.apache.storm</groupId> <artifactId>storm-kafka</artifactId> <version>1.1.0</version> </dependency> <dependency> <groupId>org.apache.kafka</groupId> <artifactId>kafka_2.10</artifactId> <version>0.8.1.1</version> <exclusions> <exclusion> <groupId>org.apache.zookeeper</groupId> <artifactId>zookeeper</artifactId> </exclusion> <exclusion> <groupId>log4j</groupId> <artifactId>log4j</artifactId> </exclusion> </exclusions> </dependency>
2.程式碼：
2.1Bolt：
package com.storm.kafka;
import org.apache.storm.task.OutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.IRichBolt;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.tuple.Fields;
import org.apache.storm.tuple.Tuple;
import java.util.Map;
/**
* @author 鄒培賢
* @Title: ${file_name}
* @Package ${package_name}
* @Description: ${todo}
* @date 2018/7/2915:27
*/
public class SplitBolt implements IRichBolt {
private TopologyContext context;
private OutputCollector collector;
@Override
public void prepare(Map map, TopologyContext topologyContext, OutputCollector outputCollector) {
this.context=topologyContext;
this.collector=outputCollector;
}
@Override
public void execute(Tuple tuple) {
String line =tuple.getString(0);
System.out.println(line);
}
@Override
public void cleanup() {
}
@Override
public void declareOutputFields(OutputFieldsDeclarer outputFieldsDeclarer) {
outputFieldsDeclarer.declare(new Fields("word"));
}
@Override
public Map<String, Object> getComponentConfiguration() {
return null;
}
}
2.2APP：
package com.storm.kafka;
import org.apache.storm.Config;
import org.apache.storm.LocalCluster;
import org.apache.storm.kafka.*;
import org.apache.storm.spout.SchemeAsMultiScheme;
import org.apache.storm.topology.TopologyBuilder;
import java.util.UUID;
/**
* @author 鄒培賢
* @Title: ${file_name}
* @Package ${package_name}
* @Description: ${todo}
* @date 2018/7/2915:30
*/
public class APP {
public static void main(String args[]){
TopologyBuilder builder=new TopologyBuilder();
String zkConnString="s10:2181,s11:2181,s12:2181";
BrokerHosts hosts = new ZkHosts(zkConnString);
//Spout配置
SpoutConfig spoutConfig=new SpoutConfig(hosts,"test","/test",UUID.randomUUID().toString());
spoutConfig.scheme=new SchemeAsMultiScheme(new StringScheme());
KafkaSpout kafkaSpout =new KafkaSpout(spoutConfig);
builder.setSpout("kafkaspout",kafkaSpout).setNumTasks(2);
builder.setBolt("split-bolt",new SplitBolt(),2).shuffleGrouping("kafkaspout").setNumTasks(2);
Config conf = new Config();
conf.setNumWorkers(2);
conf.setDebug(true);
//本地模式
LocalCluster cluster = new LocalCluster();
cluster.submitTopology("wc", conf, builder.createTopology());
}
}
3.執行結果：
