Java实现字节转换，可以自动转换为KB、MB、GB、TB

// 获取转换后的流量
    public  String getConversionFlows(String flow){
        if (null == flow || flow == "" || flow == "null") {
            return "0.00 KB";
        }
        if(StringUtils.isBlank(flow) || Double.valueOf(flow).longValue() < 10){
            return "0.00 KB";
        }
        String kbStr = Tools.div(flow, 1024, 2);
        if(Tools.compareBigDecimal(kbStr, "1024") < 0){
            return kbStr + " KB";
        }
        String mbStr = Tools.div(kbStr, "1024", 2);
        if(Tools.compareBigDecimal(mbStr, "1024") < 0){
            return mbStr + " MB";
        }
        String gbStr = Tools.div(mbStr, "1024", 2);
        if(Tools.compareBigDecimal(gbStr, "1024") < 0){
            return gbStr + " GB";
        }
        String tbStr = Tools.div(gbStr, "1024", 2);
        return tbStr+ " TB";
    }

原文地址：http://www.cnblogs.com/itcastwzp/p/16866393.html