Check whether the folder exists 检测文件夹是否存在
File config = new File("config");// List a new folder 列举一个新的文件夹
used if to realization： !config.exists() && config.isDirectory() if boolen is true then config.mkdir();
Note: check the existence of folders one by one 注意：文件夹要一个一个检查是否存在
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