用java编写的多线程下载工具，支持断点续传，支持ftp/http协议，支持下载分类跳转，做得很初级，很多功能没实现-Prepared using multi-threaded java download tools, support for HTTP, support ftp/http protocols support download categories jump, doing a good primary, a lot of features did not achieve

本代码主要是适用于初学者进行网络传输协议ftp的简单实现。-The code is simple for beginners to achieve the network transmission protocol ftp.