Just roll your own. There isn't any magic at all. Using Apache's TeeOutputStream you would basically use the code below. Of course using the Apache Commons I/O library you can leverage other classes, but sometimes it is nice to actually write something for yourself. :)
public final class TeeOutputStream extends OutputStream {
private final OutputStream out;
private final OutputStream tee;
public TeeOutputStream(OutputStream out, OutputStream tee) {
if (out == null)
throw new NullPointerException();
else if (tee == null)
throw new NullPointerException();
this.out = out;
this.tee = tee;
}
@Override
public void write(int b) throws IOException {
out.write(b);
tee.write(b);
}
@Override
public void write(byte[] b) throws IOException {
out.write(b);
tee.write(b);
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
out.write(b, off, len);
tee.write(b, off, len);
}
@Override
public void flush() throws IOException {
out.flush();
tee.flush();
}
@Override
public void close() throws IOException {
try {
out.close();
} finally {
tee.close();
}
}
}
Testing with the above class with the following
public static void main(String[] args) throws IOException {
TeeOutputStream out = new TeeOutputStream(System.out, System.out);
out.write("Hello world!".getBytes());
out.flush();
out.close();
}
would print Hello World!Hello World!.
(Note: the overridden close() could use some care tho' :)
