@Test

    public void test3() throws IOException {

        FileChannel inChannel = FileChannel.open(Paths.get("1.png"), StandardOpenOption.READ);

        FileChannel outChannel = FileChannel.open(Paths.get("4.png"),StandardOpenOption.READ,StandardOpenOption.WRITE,StandardOpenOption.CREATE);

        inChannel.transferTo(0, inChannel.size(), outChannel);

        outChannel.close();

        inChannel.close();

    }