Java IO

byte[] buff = new byte[1024];
BufferedInputStream bis = null;
OutputStream os = null;
try {
    os = res.getOutputStream();
    bis = new BufferedInputStream(new FileInputStream(file));
    int i = bis.read(buff);
    while (i != -1) {
        os.write(buff, 0, i);
        os.flush();
        i = bis.read(buff);
    }
} catch (IOException e) {
    e.printStackTrace();
} finally {
    if (bis != null) {
        try {
            bis.close();
        }
        catch (IOException e) {
            e.printStackTrace();
        }
    }
}