上传文件夹代码的实现 实现文件夹的上传，遍历文件夹树-folder upload code to achieve the realization of the upload folder, the folder tree traversal

遍历ftp文件目录。为了了解ftp服务器的文件信息。本例实现了遍历某个ftp服务器的所有文件目录的功能。-Ftp file directory traversal. To understand the ftp server file information. This example implements the traversal of all files to a ftp server directory functions.