查了查，Dir类没有size方法，也没找到现成的解决方案，自己动手吧～
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直接调用du这个程序然后把结果转换成数值就可以了，非常方便～不过要是运行在Windows下就不灵了，只好自己写代码统计下：
不过计算目录大小是个很慢的工作，尤其时文件夹嵌套很深，小文件又很多的时候，缓存一下是很必要的，当新文件上传或者删除设置个dirty标记，dirty标记存在的时候再去重新获取。
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