JAVA文件字节单位转换

 public String FormetFileSize(long fileS) {//转换文件大小        DecimalFormat df = new DecimalFormat("#.00");        String fileSizeString = "";        if (fileS < 1024) {            fileSizeString = df.format((double) fileS) + "B";        } else if (fileS < 1048576) {            fileSizeString = df.format((double) fileS / 1024) + "K";        } else if (fileS < 1073741824) {            fileSizeString = df.format((double) fileS / 1048576) + "M";        } else {            fileSizeString = df.format((double) fileS / 1073741824) + "G";        }        return fileSizeString;    }

原文地址：http://blog.163.com/code_man_china/blog/static/228155009201310114126846/?latestBlog