Two OutputStream's instead of one?

Question

I am dealing with a commerical Java API that exposes only the following logging configuration:

cplex.setOut(OutputStream arg0);

I would like to have logging to two streams: a file and the console. Is it possible?

Answer 1

Write your own OutputStream implementation which delegates calls to the write methods to two wrapped OutputStreams, one for the console and one for the file.

Answer 2

i believe it is.

I would user the apache commons io lib.

For example

FileOutputStream fos = ...;
TeeOutputStream brancher = TeeOutputStream(fos, System.out);
cplex.setOut(brancher);

Answer 3

You can use a TeeOutputStream from the Apache Commons IO library.

Answer 4

Easy:

cplex.setOut(new OutputStream() {

    public void write(int b) throws IOException {
        outputStream1.write(b);
        outputStream2.write(b);
    }
});