數組如何轉換成fileInputStream？

1、將File、fileInputStream 轉換為byte數組：File file = new File("file.txt");InputStream input = new FileInputStream(file);byte[] byt = new byte[input.available()];input.read(byt);

2、將byte數組轉換為InputStream：byte[] byt = new byte[1024];InputStream input = new ByteArrayInputStream(byt);

3、將byte數組轉換為File：File file = new File('');OutputStream output = new FileOutputStream(file);BufferedOutputStream bufferedOutput = new BufferedOutputStream(output);bufferedOutput.write(byt);