Scala: InputStream to Array[Byte]

Question

With Scala, what is the best way to read from an InputStream to a bytearray?

I can see that you can convert an InputStream to char array

Source.fromInput         


        

Answer 1

In a similar vein to Eastsun's answer... I started this as a comment, but it ended up getting just a bit to long!

I'd caution against using Stream, if holding a reference to the head element then streams can easily consume a lot of memory.

Given that you're only going to read in the file once, then Iterator is a much better choice:

def inputStreamToByteArray(is: InputStream): Array[Byte] =
  Iterator continually is.read takeWhile (-1 !=) map (_.toByte) toArray