Scala logging, direct console output to log-file

Question

Is there way to direct console-output to log file using scala logging. In below code println writes to console is there way to direct that to log-file as defined logback.xml.

import com.typesafe.scalalogging.LazyLogging

object FileProcessing extends LazyLogging  {

  def  main(args: Array[String]): Unit = {
    val fp = new FileProcessing
    logger.info(fp.fileMoves.toString())
    println("My desired directory is - "+fp.dir)   
  }
}

Using below scala logging my build.gradle

compile "ch.qos.logback:logback-classic:1.1.7"
compile "com.typesafe.scala-logging:scala-logging_2.12:3.5.0"

You need to modify you logger config file to include a file output — puhlen, Jul 31 '17 at 18:15

score 3 · Answer 1 · answered Jul 31 '17 at 18:32

println writes to Console.out. You can give it any stream you want. For example:

Console.withOut(new PrintStream(new FileOutputStream("/dev/null"))) {
  println("this will not be printed anywhere")
}
Console.withOut(new PrintStream(new FileOutputStream("console.txt"))) {
  println("this is printed to console.txt")
}
println("This still goes to stdout")

You can also change the output stream globally with (deprecated) Console.setOut, but this isn't really a good idea (like any other idea, involving changing global JVM state at run time). You are much better off just running your program with > console.txt on command line in that case.

Note, that, if someone else (besides println/Console is also writing to the same file), the results you get aren't probably going to be what you like, because of buffering and racing).

Scala logging, direct console output to log-file

1 Answers1