Class that store FTP Commands with parameters - use with FTP Queue 可以进行简单的Ftp操作（上传、下载），并支持右键菜单（新建文件夹、下载、重命名等） 支持拖拽的上传和下载-Class that store FTP Commands with parameters- use with FTP Queue Ftp can be a simple operation (upload, download), and suppo