There are a lot of ways to handle configuration files in a Scala program; my favorite one is to use TypeSafe's Config project
This library scans the CLASSPATH for a predefined set of configuration files in different formats
Using it it's pretty straightforward so let's get to it :
1.- Add your dependency to sbt
libraryDependencies += "com.typesafe" % "config" % "1.2.1"
2.- Loading the configuration file
//load the configuration file from the classpath val conf = ConfigFactory.load
The convenience method ConfigFactory.load() loads the following (first-listed are higher priority):
- system properties
- application.conf (all resources on classpath with this name)
- application.json (all resources on classpath with this name)
- application.properties (all resources on classpath with this name)
- reference.conf (all resources on classpath with this name)
The idea is that libraries and frameworks should ship with a reference.conf in their jar. Applications should provide an application.conf, or if they want to create multiple configurations in a single JVM, they could use ConfigFactory.load("myapp") to load their own myapp.conf. (Applications can provide a reference.conf also if they want, but you may not find it necessary to separate it from application.conf.)
3.- Reading the configuration file values
//retrieve configuration files values
val remoteIp = conf.getString("server.ip")
val remotePort = conf.getInt("server.port")
That's it for today; have fun!
