byte數組和File，InputStream互轉

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);