Flink读取Kafka数据，进行汇总

./kafka-console-producer.sh --broker-list 192.168.58.177:9092 --topic my_topic

　　　　 StreamExecutionEnvironment Env = StreamExecutionEnvironment.getExecutionEnvironment();

        Properties properties = new Properties();
        properties.setProperty("bootstrap.servers", "192.168.58.177:9092");
        properties.setProperty("zookeeper.connect", "192.168.58.171:2181,192.168.58.177:2181");
        properties.setProperty("group.id", "test");

        FlinkKafkaConsumer<String> myConsumer = new FlinkKafkaConsumer<String>("my_topic",new SimpleStringSchema(),properties);

        myConsumer.setStartFromLatest();
        myConsumer.setStartFromGroupOffsets();


        Env.setParallelism(2).setStreamTimeCharacteristic(TimeCharacteristic.EventTime);

        DataStream<Tuple2<String,Integer>> stream = Env.addSource(myConsumer)
                .flatMap((String lines, Collector<Tuple2<String,Integer>> out) ->
                        Stream.of(lines.split(","))
                        .forEach(a -> out.collect(Tuple2.of(a,1))))
                .returns(Types.TUPLE(Types.STRING,Types.INT))
                .keyBy(0)
                //.window(TumblingEventTimeWindows.of(Time.seconds(5)))
                .sum(1)
                ;

        //stream.writeAsText("C:\\Users\\yaowentao\\Desktop\\a");
        stream.print();
        Env.execute("my first stream flink");