flink DataStream wc

import org.apache.flink.streaming.api.scala.{DataStream, StreamExecutionEnvironment}

object FlinkDemo02_Stream_wc {
    def main(args: Array[String]): Unit = {
        //1 获取执行环境
        val env = StreamExecutionEnvironment.getExecutionEnvironment
        //2 获取数据集
        val ds: DataStream[String] = env.socketTextStream("linux01", 9999)
        //3 执行
        import org.apache.flink.api.scala._
        val result: DataStream[(String, Int)] = ds.flatMap(_.split("\\s"))
          .filter(_.nonEmpty)
              .map((_, 1))
                  .keyBy(0)
                      .sum(1)
        result.print().setParallelism(1)
        
        //4 启动executor， 执行任务
        env.execute("socket_stream_wc")
    }
}