Storm实战之HelloWorld

官网建议首先是WordCount,个人觉得，如果学习，看代码可以是WordCount,但如果是个人写Topology,首先应该HelloWorld，然后是WordCount.

闲话少说，上代码：

package helloworld;import backtype.storm.Config;import backtype.storm.LocalCluster;import backtype.storm.StormSubmitter;import backtype.storm.topology.TopologyBuilder;/** * 定义了一个简单的topology，包括一个数据喷发节点spout和一个数据处理节点bolt。 *  * @author Administrator * */public class SimpleTopology {    public static void main(String[] args) {        try {         System.out.println("1111111111111111111");            // 实例化TopologyBuilder类。            TopologyBuilder topologyBuilder = new TopologyBuilder();            // 设置喷发节点并分配并发数，该并发数将会控制该对象在集群中的线程数。            topologyBuilder.setSpout("SimpleSpout", new SimpleSpout(), 1);            // 设置数据处理节点并分配并发数。指定该节点接收喷发节点的策略为随机方式。            topologyBuilder.setBolt("SimpleBolt", new SimpleBolt(), 2).shuffleGrouping("SimpleSpout");            Config config = new Config();            config.setDebug(true);            System.out.println("2222222222222222");            if (args != null && args.length > 0) {                config.setNumWorkers(1);                StormSubmitter.submitTopology(args[0], config, topologyBuilder.createTopology());            } else {                // 这里是本地模式下运行的启动代码。             System.out.println("3333333333333333");                config.setMaxTaskParallelism(1);                LocalCluster cluster = new LocalCluster();                cluster.submitTopology("simple", config, topologyBuilder.createTopology());                System.out.println("444444444444444444");            }                    } catch (Exception e) {            e.printStackTrace();         }    }}

Spout:

package helloworld;import java.util.Map;import java.util.Random;import backtype.storm.spout.SpoutOutputCollector;import backtype.storm.task.TopologyContext;import backtype.storm.topology.OutputFieldsDeclarer;import backtype.storm.topology.base.BaseRichSpout;import backtype.storm.tuple.Fields;import backtype.storm.tuple.Values;/** * Spout起到和外界沟通的作用，他可以从一个数据库中按照某种规则取数据，也可以从分布式队列中取任务 *  * @author Administrator * *数据源为内置的一个数组，随机在数组中选择一条发射 */@SuppressWarnings("serial")public class SimpleSpout extends BaseRichSpout{    //用来发射数据的工具类    private SpoutOutputCollector collector;    private static String[] info = new String[]{        "comaple\t,12424,44w46,654,12424,44w46,654,",        "lisi\t,435435,6537,12424,44w46,654,",        "lipeng\t,45735,6757,12424,44w46,654,",        "hujintao\t,45735,6757,12424,44w46,654,",        "jiangmin\t,23545,6457,2455,7576,qr44453",        "beijing\t,435435,6537,12424,44w46,654,",        "xiaoming\t,46654,8579,w3675,85877,077998,",        "xiaozhang\t,9789,788,97978,656,345235,09889,",        "ceo\t,46654,8579,w3675,85877,077998,",        "cto\t,46654,8579,w3675,85877,077998,",        "zhansan\t,46654,8579,w3675,85877,077998,"};        Random random=new Random();        /**     * 初始化collector     */    public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {    System.out.println("5555555555555555555555");        this.collector = collector;        System.out.println("6666666666666");    }        /**     * 在SpoutTracker类中被调用，每调用一次就可以向storm集群中发射一条数据（一个tuple元组），该方法会被不停的调用     */    @Override    public void nextTuple() {        try {            String msg = info[random.nextInt(11)];            // 调用发射方法            System.out.println("777777777777777777");            collector.emit(new Values(msg));            System.out.println("8888888888888888");            // 模拟等待100ms            Thread.sleep(5000);        } catch (InterruptedException e) {            e.printStackTrace();        }    }    /**     * 定义字段id，该id在简单模式下没有用处，但在按照字段分组的模式下有很大的用处。     * 该declarer变量有很大作用，我们还可以调用declarer.declareStream();来定义stramId，该id可以用来定义更加复杂的流拓扑结构     */    @Override    public void declareOutputFields(OutputFieldsDeclarer declarer) {    System.out.println("99999999999999");        declarer.declare(new Fields("source")); //collector.emit(new Values(msg));参数要对应        System.out.println("aaaaaaaaaaaaaaaa");    }}

Bolt:

package helloworld;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;/** * 接收喷发节点(Spout)发送的数据进行简单的处理后，发射出去。 *  * @author Administrator *  */@SuppressWarnings("serial")public class SimpleBolt extends BaseBasicBolt {    public void execute(Tuple input, BasicOutputCollector collector) {        try {            String msg = input.getString(0);            if (msg != null){                //System.out.println("msg="+msg);                collector.emit(new Values(msg + "msg is processed!"));            }                        } catch (Exception e) {            e.printStackTrace();         }    }    public void declareOutputFields(OutputFieldsDeclarer declarer) {        declarer.declare(new Fields("info"));    }}