这个是实现usb插拔的jar包，导入后相当管用，把他放在项目的lib下，然后就可以使用啦，这个是Windows的系统使用，谢谢(This is a usb plug-pulled jar, which is quite useful after the import, put him under the project lib, and then you can use it. This is the Windows system for use, thank you)