使用IDEA新建maven工程，添加相關依賴：

1.8

1.8

2.11.11

2.3.0

2.7.7

utf-8

org.scala-lang

scala-library

${scala.version}

org.apache.spark

spark-core_2.11

${spark.version}

org.apache.hadoop

hadoop-client

2.7.7

給項目添加scala支持，新建Scala Object文件

編寫程序：

import org.apache.spark.rdd.RDD

import org.apache.spark.{SparkConf, SparkContext}

object WordCountDemo {

def main(args: Array[String]): Unit = {

//創建Spark配置對象SparkConf，設置應用程序名字

val conf = new SparkConf().setAppName("WordCountDemo")

//創建spark執行入口

val sc = new SparkContext(conf)

//指定以后從哪里讀取數據創建RDD(彈性分布式數據集)

val lines: RDD[String] = sc.textFile(args(0))

//切分壓平

val words: RDD[String] = lines.flatMap(_.split(" "))

//將單詞和1組合

val wordAndOne: RDD[(String, Int)] = words.map((_, 1))

//按key進行聚合

val reduced: RDD[(String, Int)] = wordAndOne.reduceByKey(_+_)

//按value進行排序

val sorted: RDD[(String, Int)] = reduced.sortBy(_._2, false)

//將結果保存到hdfs中

sorted.saveAsTextFile(args(1))

//釋放資源

sc.stop()

}

}

執行maven的打包命令

將打包上傳至服務器

開啟hdfs和spark，將輸入文本上傳至hdfs

執行任務：

/soft/spark/bin/spark-submit --class com.wby.demo.WordCountDemo /root/jars/spark-1.0-SNAPSHOT.jar hdfs://192.168.124.132:9000/test/w hdfs://192.168.124.132:9000/test/res