Java版WordCount(lambda)

x33g5p2x  于2021-03-14 发布在 Flink  
字(1.1k)|赞(0)|评价(0)|浏览(333)
package com.gosuncn;

import org.apache.flink.api.common.typeinfo.Types;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.util.Collector;

public class WordCountStreamingJob {

    public static void main(String[] args) throws Exception {
        final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        DataStream<String> lines = env.socketTextStream("47.52.74.183", 8888);
//        DataStream<Tuple2> wordAndOne = lines.flatMap((FlatMapFunction<String, Tuple2>) (line, out) -> {
//            for (String word : line.split(" ")) {
//                out.collect(Tuple2.of(word, 1));
//            }
//        }).returns(Types.TUPLE(Types.STRING, Types.INT));
        DataStream<Tuple2> wordAndOne = lines.flatMap((String line, Collector<Tuple2> out) -> {
            for (String word : line.split(" ")) {
                out.collect(Tuple2.of(word, 1));
            }
        }).returns(Types.TUPLE(Types.STRING, Types.INT));
        DataStream<Tuple2> summed = wordAndOne.keyBy(0).sum(1);
        summed.print();
        env.execute("WordCountStreamingJob");
    }
}

相关文章