Flink入门及运行

入门级程序

public class SocketWindowWordCountJava {

    public static void main(String[] args) throws Exception {
        //获取 flink 的运行环境
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        String host="localhost";
        int port=9000;
        String delimiter="\n";
        //
        DataStreamSource<String> text = env.socketTextStream(host, port, delimiter);

        SingleOutputStreamOperator<WordCount> wcs = text.flatMap(new FlatMapFunction<String, WordCount>() {
            @Override
            public void flatMap(String value, Collector<WordCount> out) throws Exception {
                String[] vs = value.split("\\s");
                for (String word : vs) {
                    out.collect(new WordCount(word, 1L));
                }
            }
        }).keyBy("word")
                .timeWindow(Time.seconds(2), Time.seconds(1))
                .sum("count");

        wcs.print().s