storm 示例demo

简单的storm入门示例，从0到1让你清楚的理解storm.下面是代码示例： import backtype.storm.topology.BasicOutputCollector; import backtype.storm.topology.OutputFieldsDeclarer; import backtype.storm.topology.base.BaseBasicBolt; import backtype.storm.tuple.Fields; import backtype.storm.tuple.Tuple; import backtype.storm.tuple.Values; public class WordNormalizer extends BaseBasicBolt { public void cleanup() {} /** * The bolt will receive the line from the * words file and process it to Normalize this line * * The normalize will be put the words in lower case * and split the line to get all words in this */ public void execute(Tuple input, BasicOutputCollector collector) { String sentence = input.getString(0); String[] words = sentence.split(" "); for(String word : words){ word = word.trim(); if(!word.isEmpty()){ word = word.toLowerCase(); collector.emit(new Values(word)); } } } /** * The bolt will only emit the field "word" */ public void declareOutputFields(OutputFieldsDeclarer declarer) { declarer.declare(new Fields("word")); } }