java B转换KB MB GB TB PB EB ZB

public static String readableFileSize(long size) {
        if (size <= 0) {
            return "0";
        }
        final String[] units = new String[]{"B", "kB", "MB", "GB", "TB", "PB","EB","ZB"};
        int digitGroups = (int) (Math.log10(size) / Math.log10(1024));
        return new DecimalFormat("#,##0.#").format(size / Math.pow(1024, digitGroups)) + " " + units[digitGroups];
    }

     

public static void main(String[] args) {
        String str= "212132342412";
        String str=MyCommonTool.readableFileSize(Long.parseLong(str)+'l');
        System.out.println("str="+str);

    }