jstorm系列-2：入门

ゞ浴缸里的玫瑰 2023-06-04 05:52 4阅读 0赞

有了基本的概念之后，我们用jstorm来做一点小事情吧

做一个很无聊的事情：给定一个时间戳，输出对应的问候语

规则是：时间戳的十位对应的数字对应不同的时间段，0-2代表早上，3代表中午，4-6代表下午，7-9代表晚上，分别输出早上，中午，下午和晚上。

我们用spout来发送时间戳，bolt来处理时间戳并输出对应的问候语，并且统计每一时间段的问候数目，判断时间戳的生成是否随机。

代码如下：

public class TimeStampSpout implements IRichSpout{
         
        private static final long serialVersionUID = 1L;
        private SpoutOutputCollector collector;
    
        @Override
    　　　　。。。。一切没有用到的函数不展示
    
        @Override
        public void nextTuple() {
         
            long now = System.currentTimeMillis();
            Values tuple = new Values(now);
            System.out.println("spout:"+tuple);
            this.collector.emit(tuple);
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
         
                e.printStackTrace();
            }
        }
    
        @Override
        public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
         
            this.collector = collector;
        }
    
        @Override
        public void declareOutputFields(OutputFieldsDeclarer declarer) {
         
            declarer.declare(new Fields("timestamp"));
        }
    
    }

public class GreetingBolt implements IRichBolt{
        private static final long serialVersionUID = 1L;
        private static Map<String, Integer> count = new TreeMap<String, Integer>(); 
        private final String morning = "morning"; 
        private final String noon = "noon"; 
        private final String afternoon = "afternoon"; 
        private final String evening = "evening";
        private static Integer total = 0;
        @Override
        public void cleanup() {
        }
    
        @Override
        public void execute(Tuple input) {
            long timestamp= input.getLong(0);
    //        System.out.println("bolt:"+timestamp);
            total+=1;
    //        获取十位数
            long second = (timestamp/10)%10;
            if(second<3){
                System.out.println("bolt:"+morning); 
                count.put(morning, (count.get(morning)==null)?1:count.get(morning)+1);
            }
            else if(second==3){
                System.out.println("bolt:"+noon);
                count.put(noon, (count.get(noon)==null)?1:count.get(noon)+1);
            }
            else if(second<8){
                System.out.println("bolt:"+afternoon);
                count.put(afternoon, (count.get(afternoon)==null)?1:count.get(afternoon)+1);
            }
            else{
                System.out.println("bolt:"+evening);
                count.put(evening, (count.get(evening)==null?1:count.get(evening)+1));
            }
            if(total%10==0){
                System.out.println("distribution show as followed:");
                System.out.println(morning+":"+1.0*((count.get(morning)==null)?0:count.get(morning))/total);
                System.out.println(noon+":"+1.0*((count.get(noon)==null?0:count.get(noon)))/total);
                System.out.println(afternoon+":"+1.0*((count.get(afternoon)==null?0:count.get(afternoon)))/total);
                System.out.println(evening+":"+1.0*((count.get(evening)==null?0:count.get(evening)))/total);
            }
        }
    
    }

public class TestTopology {
        public static void main(String[] args) {
            TopologyBuilder builder = new TopologyBuilder();
            builder.setSpout("TimeStampSpout", new TimeStampSpout());
            builder.setBolt("GreetingBolt",new GreetingBolt()).shuffleGrouping("TimeStampSpout");
            LocalCluster cluster = new LocalCluster();
            Config config = new Config();
            cluster.submitTopology("test", config, builder.createTopology());
        }
    }

转载于:https://www.cnblogs.com/qwj-sysu/p/5172005.html