How to read a text file using Relative path in scala

Question

I have a simple mvn project written in scala. I want to access a text file and read its content. The code is working fine but the only issue is I am giving the absolute path when reading the text file. Following is the directory structure of my project.

How can I use the relative path to read that file? (Do I have to move the movies.txt file in to the resources directory, if so still how would I read that file?)

Any insight will be much appreciated. Thank you

myproject
|-src
|  |-resources
|  |-scala
|      |-movies.simulator
|           |-Boot
|           |-Simulate
|                |-myobject.scala
|                      |Simulate
|
|-target
|-pom.xml
|-README
|-movies.txt

In the myobject.scala where the Simulate is the package object, I access the movies.txt file using the absolute path.

import scala.io.Source
Source
    .fromFile("/home/eshan/projecs/myproject/movies.txt")
    .getLines
    .foreach { line =>
    count+=1
      // custom code            
}

os-lib is the best modern solution, see my answer for more details. — Powers
– Powers, Commented Dec 16, 2020 at 2:33

ka4eli · Accepted Answer · 2015-07-16 12:14:31Z

9

Move your movies.txt to resources dir, then you can do the following:

val f = new File(getClass.getClassLoader.getResource("movies.txt").getPath)

import scala.io.Source
Source
    .fromFile(f)
    .getLines
    .foreach { line =>
    count+=1
      // custom code            
}

answered Jul 16, 2015 at 12:14

ka4eli

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4 Comments

user4700203 Over a year ago

Hello, I suppose this will work. I am getting an unrelated error of movies.txt file not being found in target/myproject/lib. Once I fix it I believe your solution will work. Thanks for the quick response.

user4700203 Over a year ago

I had to change the .txt to .conf. (to fix the unrelated issue). Then your solution worked for the movies.conf with the addition of the "import java.io.File" to my scala code. Thanks

Andrey Over a year ago

i am getting error

reference to getClass is ambiguous; it is both defined in class Object and imported subsequently by import sparkSession.implicits._

when I am trying to use your approach, but don't understand why? any idea ?

AvinashK Over a year ago

@Andrey... just use this.getClass instead of just getClass

Gids · Accepted Answer · 2020-04-22 09:09:53Z

5

More concisely you can use:

Source.fromResource("movies.txt")

which will look for a path relative to the resources folder.

answered Apr 22, 2020 at 9:09

Gids

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Comments

Powers · Accepted Answer · 2020-12-16 02:32:50Z

1

os-lib is the best way to read files with Scala.

os.read(os.pwd/"movies.txt")

os-lib also supports relative paths but those shouldn't be needed here.

This lib makes it easy to read files, construct paths, and other filesystem operations, see here for more details.

answered Dec 16, 2020 at 2:32

Powers

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1 Comment

Rodolfo Velasco Over a year ago

This library helped me. Thanks. Remember when using os.pwd and the folder is deeper in the filesystem you will need to use "segment" for example: os.pwd/"jsonFolder"/"guitarFolder"/"guitar.json"

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