How can I read a file to an InputStream then write it into an OutputStream in Scala?

Question

I'm trying to use basic Java code in Scala to read from a file and write to an OutputStream, but when I use the usual while( != -1 ) in Scala gives me a warning "comparing types of Unit and Int with != will always yield true".

The code is as follows:

    val file = this.cache.get(imageFileEntry).getValue().asInstanceOf[File]
    response.setContentType( "image/%s".format( imageDescription.getFormat() ) )

    val input = new BufferedInputStream( new FileInputStream( file ) )
    val output = response.getOutputStream()

    var read : Int = -1

    while ( ( read = input.read ) != -1 ) {
        output.write( read )
    }

    input.close()
    output.flush()

How am I supposed to write from an input stream to an output stream in Scala?

I'm mostly interested in a Scala-like solution.

Answer 1

You could do this:

Iterator 
.continually (input.read)
.takeWhile (-1 !=)
.foreach (output.write)