基于JAVA技术的设计和实现，将解决的主要问题如下：通过多线程技术，实现多线程下载，提高网络下载速度。通过线程实现断点续传，可分时段下载-The design and implementation based on JAVA technology, will address the main issues are as follows: multi-threading technology, multi-threaded download to increase download speeds. HTTP can be divided into periods download by thread