```java 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"); } } ```