@Test
    public void test() {
        String filePath = "C:\\Users\\xxxxx8\\Desktop\\temp.txt";
        byte[] buff = new byte[1024]; // 一次取出的字节大小
        int i = 0;
        try (FileInputStream fis = new FileInputStream(filePath)) {
            // i的目的在于防止最后一次读取的字节小于b长度,否则会自动被填充0
            if ((i = fis.read(buff)) != -1) {
                System.out.println(new String(buff, 0, i));
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

    }