public String formatByte(long byteNumber) {
        //换算单位
        double FORMAT = 1024.0;
        double kbNumber = byteNumber / FORMAT;
        if (kbNumber < FORMAT) {
            return decimalFormat("#.##KB", kbNumber);
        }
        double mbNumber = kbNumber / FORMAT;
        if (mbNumber < FORMAT) {
            return decimalFormat("#.##MB", mbNumber);
        }
        double gbNumber = mbNumber / FORMAT;
        if (gbNumber < FORMAT) {
            return decimalFormat("#.##GB", gbNumber);
        }
        return decimalFormat("#.##TB", gbNumber / FORMAT);
    }

    public String decimalFormat(String pattern, double number) {
        return new DecimalFormat(pattern).format(number);
    }