Scala Datei I/O

Scala führt Datei-Schreiboperationen direkt durch, die in Java der I/Klasse (java.io.File)：

import java.io._
object Test {
　　　def main(args: Array[String]) {
　　　　　　val writer = new PrintWriter(new File("test.txt"))
　　　　　　writer.write("Grundlagen-Tutorial-Website")
　　　　　　writer.close()
　　　}
}

After executing the above code, a test.txt file will be created in your current directory with the content "Basic Tutorial Website":

$ scalac Test.scala　
$ scala Test
$ cat test.txt　
Basic Tutorial Website

Reading user input from the screen

Sometimes we need to receive user instructions entered on the screen to process the program. Here is an example:

import scala.io._
object Test {
　　　def main(args: Array[String]) {
　　　　　　print("Please enter the official website of Basic Tutorial Website: ")
　　　　　　val line = StdIn.readLine()
　　　　　　println("Thank you, you entered: ")　+　line)
　　　}
}

Scala2.11 in later versions Console.readLine Deprecated, use the scala.io.StdIn.readLine() method instead.

After executing the above code, the following information will be displayed on the screen:

$ scalac Test.scala　
$ scala Test
Please enter the official website of Basic Tutorial Website: de.oldtoolbag.com
Thank you, you entered: de.oldtoolbag.com

Reading content from a file

Reading content from a file is very simple. We can use Scala's Source Classes and companion objects to read files. The following example demonstrates reading content from the "test.txt" file (previously created):

import scala.io.Source
object Test {
　　　def main(args: Array[String]) {
　　　　　　println("File Content:")
　　　　　　Source.fromFile("test.txt").foreach{　
　　　　　　　　　print　
　　　　　　}
　　　}
}

After executing the above code, the output will be:

$ scalac Test.scala　
$ scala Test
File Content:
Basic Tutorial Website