java 中 byte[]、File、InputStream 互相轉換1、將File、FileInputStream 轉換為byte陣列：File file = new File("test.txt");InputStream input = new FileInputStream(file);byte[] byt = new byte[input.available()];input.read(byt);2、將byte陣列轉換為InputStream：byte[] byt = new byte[1024];InputStream input = new ByteArrayInputStream(byt);3、將byte陣列轉換為File：File file = new File('');OutputStream output = new FileOutputStream(file);BufferedOutputStream bufferedOutput = new BufferedOutputStream(output);bufferedOutput.write(byt);