Java: da un InputStream ad un array di byte

public static byte[] readBytes(InputStream inputStream) throws IOException {
		ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
		try {
			byte[] b = new byte[1024];
			int len = 0;
			while ((len = inputStream.read(b, 0, b.length)) != -1) {
				outputStream.write(b, 0, len);
			}
		} finally {
			if (inputStream != null) {
				try {
					inputStream.close();
				} catch (Throwable t) {
				}
			}
			try {
				outputStream.close();
			} catch (Throwable t) {
			}
		}
		return outputStream.toByteArray();
	}