Scala统计一个文件所有单词出现的次数

 1 import scala.io.Source  
  
object WordCount extends App {  
  
  val path = "C:\\Users\\Administrator\\Desktop\\ff\\fzsExample\\src"  
  val file = new File(path)  
  val files = file.listFiles().filter(_.isFile)  
  val mapData = scala.collection.mutable.Map[String, Int]()  
  
  def readFile(item : File): Unit = {  
    try {  
        Source.fromFile(item).getLines().flatMap(_.split("\\s+")).toList.map(x => {  
        mapData.get(x) match {  
          case Some(b) => mapData += ( x -> b.+(1))  
          case None => mapData += ( x -> 1)  
        }  
      })  
    }catch{  
      case e1: FileNotFoundException => println("FileNotFoundException")  
      case e2: RuntimeException => println("RuntimeException")  
      case e3: Exception => println("Exception")  
    }  
  }  
  
  files.map(readFile)  
  println(mapData)  

 

方法二：

 val wordlist = Source.fromFile(item).getLines().flatMap(line => line.split(" ")).map(word => (word, 1))  
   //方法一：先groupBy再map  
   wordlist.groupBy(_._1).map {  
     case (word, list) => (word, list.size)  
   }.foreach(println)  

}