CODEWITHSUNDEEP
scalaoutput
ALs
ALs

Reputation: 509

Writing data generated in scala to a text file

I was hoping somebody could help, I'm new to scala and I'm having some issues writing my output to a text file.

I have a data table and I've written some code to read it in one line at a time, do what I want it to do, and now I need it to write that line to a text file.

So for example, I have the following table of data type

Name, Date, goX, goY, stopX, stopY

1, 12/01/01, 1166, 2299, 3300, 4477

My code, takes the first characters of goX and goY and creates a new number, in this instance 1.2 and does the same for stopX and stopY so in this case you get 3.4

What I want to get in the text file is essentially the following:

go, stop

1.2, 3.4

and I want it to go through hundreds of lines doing this until I have a long list of on and off in the text file.

My current code is as follows, this is almost certainly not the most elegant solution but it is my first ever scala/java code:

import scala.io.Source

object FT2 extends App {
for(line<-Source.fromFile("C://Users//Data.csv").getLines){

var array = line.split(",")
val gox = (array(2));
val xStringGo = gox.toString
val goX =xStringGo.dropRight(1|2)
val goy = (array(3));
val yStringGo = goy.toString
val goY = yStringGo.dropRight(1|2)
val goXY = goX+"."+goY

val stopx = (array(4));
val xStringStop = stopx.toString
val stopX =xStringStop.dropRight(1|2)
val stopy = (array(3));
val yStringStop = stopy.toString
val stopY = yStringStop.dropRight(1|2)
val stopXY = stopX+"."+stopY

val GoStop = List(goXY,stopXY)
//This is where I want to print GoStop to a text file
}

Any help is much appreciated!

Upvotes: 2

Views: 16876

Answers (1)

dhg
dhg

Reputation: 52681

This should do it:

import java.io._

val data = List("everything", "you", "want", "to", "write", "to", "the", "file")

val file = "whatever.txt"
val writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file)))
for (x <- data) {
  writer.write(x + "\n")  // however you want to format it
}
writer.close()

But you can make it a little nicer by creating a method that will automatically close stuff for you:

def using[T <: Closeable, R](resource: T)(block: T => R): R = {
  try { block(resource) }
  finally { resource.close() }
}

using(new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file)))) { 
  writer =>
    for (x <- data) {
      writer.write(x + "\n")  // however you want to format it
    }
}

So:

using(new BufferedWriter(new OutputStreamWriter(new FileOutputStream("output.txt")))) { 
  writer =>
    for(line <- io.Source.fromFile("input.txt").getLines) {
      writer.write(line + "\n")  // however you want to format it
    }
}

Upvotes: 11

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