This post originated from an RSS feed registered with Scala Buzz by Zemian Deng. Original Post: Improving java.io.File with Scala Feed Title: thebugslayer Feed URL: http://www.jroller.com/thebugslayer/feed/entries/atom?cat=%2FScala+Programming Feed Description: Notes on Scala and Sweet web framework Latest Scala Buzz Posts Latest Scala Buzz Posts by Zemian Deng Latest Posts From thebugslayer

• File#deleteAll // remove directory recursively
• File#write(line) // write a single line into a new file
• File#foreachLine{ line => /* process line */ } // loop through each line in file with your processing codes

import java.io._
class FileHelper(file : File) {
  def write(text : String) : Unit = {
    val fw = new FileWriter(file)
    try{ fw.write(text) }
    finally{ fw.close }
  }
  def foreachLine(proc : String=>Unit) : Unit = {
    val br = new BufferedReader(new FileReader(file))
    try{ while(br.ready) proc(br.readLine) }
    finally{ br.close }
  }
  def deleteAll : Unit = {
    def deleteFile(dfile : File) : Unit = {
      if(dfile.isDirectory){
        val subfiles = dfile.listFiles
        if(subfiles != null)
          subfiles.foreach{ f => deleteFile(f) }
      }
      dfile.delete
    }
    deleteFile(file)
  }
}
object FileHelper{
  implicit def file2helper(file : File) = new FileHelper(file)
}

//Now you can test it.
import FileHelper._
val dir = new File("/tmp/mydir/nested_dir")
dir.mkdirs
val file = new File(dir, "myfile.txt")
file.write("one\ntwo\nthree")
file.foreachLine{ line => println(">> " + line) }
dir.deleteAll