pom.xml文件内容：
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
WordCountTopology.java代码：
package com.xu.eshop.storm;
import org.apache.storm.Config;
import org.apache.storm.LocalCluster;
import org.apache.storm.StormSubmitter;
import org.apache.storm.spout.SpoutOutputCollector;
import org.apache.storm.task.OutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.TopologyBuilder;
import org.apache.storm.topology.base.BaseRichBolt;
import org.apache.storm.topology.base.BaseRichSpout;
import org.apache.storm.tuple.Fields;
import org.apache.storm.tuple.Tuple;
import org.apache.storm.tuple.Values;
import org.apache.storm.utils.Utils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
public class WordCountTopology {
public static class RandomSentenceSpout extends BaseRichSpout {
private static final Logger LOGGER = LoggerFactory.getLogger(RandomSentenceSpout.class);
private Random random;
private SpoutOutputCollector collector;
public void open(Map map, TopologyContext topologyContext, SpoutOutputCollector collector) {
this.collector = collector;
this.random = new Random();
}
public void nextTuple() {
Utils.sleep(100);
String[] sentences = new String[]{"the cow jumped over the moon", "an apple a day keeps the doctor away",
"four score and seven years ago", "snow white and the seven dwarfs", "i am at two with nature"};
final String sentence = sentences[random.nextInt(sentences.length)];
LOGGER.info("发射句子：" + sentence);
this.collector.emit(new Values(sentence));
}
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("sentence"));
}
}
public static class SplitSentence extends BaseRichBolt {
private OutputCollector collector;
public void prepare(Map conf, TopologyContext context, OutputCollector collector) {
this.collector = collector;
}
public void execute(Tuple tuple) {
String sentence = tuple.getStringByField("sentence");
String[] words = sentence.split(" ");
for(String word : words) {
this.collector.emit(new Values(word));
}
}
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("word"));
}
}
public static class WordCount extends BaseRichBolt {
private static final Logger LOGGER = LoggerFactory.getLogger(WordCount.class);
private OutputCollector collector;
private Map
public void prepare(Map conf, TopologyContext context, OutputCollector collector) {
this.collector = collector;
}
public void execute(Tuple tuple) {
String word = tuple.getStringByField("word");
Long count = this.wordCounts.get(word);
if(count == null) {
count = 0L;
}
count ++;
this.wordCounts.put(word, count);
LOGGER.info("单词计数" + word + "出现的次数是" + count);
this.collector.emit(new Values(word, count));
}
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("word", "count"));
}
}
public static void main(String[] args) {
TopologyBuilder builder = new TopologyBuilder();
builder.setSpout("RandomSentence", new RandomSentenceSpout(), 5);
builder.setBolt("SplitSentence", new SplitSentence(), 5)
.setNumTasks(10)
.shuffleGrouping("RandomSentence");
builder.setBolt("WordCount", new WordCount(), 10)
.setNumTasks(20)
.fieldsGrouping("SplitSentence", new Fields("word"));
Config config = new Config();
config.setDebug(false);
if(args != null && args.length > 0) {
config.setNumWorkers(3);
try {
StormSubmitter.submitTopology(args[0], config, builder.createTopology());
} catch (Exception e) {
e.printStackTrace();
}
} else {
config.setMaxTaskParallelism(20);
LocalCluster cluster = new LocalCluster();
cluster.submitTopology("WordCountTopology", config, builder.createTopology());
Utils.sleep(60000);
cluster.shutdown();
}
}
}