Read/Write Files in Scala

1. Read and write text files in Scala

import scala.io._
import java.io.{FileNotFoundException, IOException}

val filename = "no-such-file.scala"
try {
  for (line <- Source.fromFile(filename).getLines) {
    println(line)
  }
} catch {
  case e: FileNotFoundException => println("Couldn't find that file.")
  case e: IOException => println("Got an IOException!")
}

finally{

  filename.close 

} 

val file = new File(canonicalFilename)
val bw = new BufferedWriter(new FileWriter(file))
bw.write(text)
bw.close()

2. Read and write binary files in Scala

import java.io._

object CopyBytes extends App {

  var in = None: Option[FileInputStream]
  var out = None: Option[FileOutputStream]

  try {
    in = Some(new FileInputStream("/tmp/Test.class"))
    out = Some(new FileOutputStream("/tmp/Test.class.copy"))
    var c = 0
    while ({c = in.get.read; c != −1}) {
      out.get.write(c)
    }
  } catch {
    case e: IOException => e.printStackTrace
  } finally {
    println("entered finally ...")
    if (in.isDefined) in.get.close
    if (out.isDefined) out.get.close
  }

}