Java: drain an inputstream of bytes

draininputstream

    private byte[] drainInputStream(InputStream is) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] buffer = new byte[8192];
        int bytesRead;
        while ((bytesRead = is.read(buffer)) != -1) {
            baos.write(buffer, 0, bytesRead);
        }
        return baos.toByteArray();
    }