How to access USB ports in java

There is nothing equivalent to C#'s USB support in Java. Both jUSB and Java-USB are severely out-of-date and likely unusable for any serious application development.

If you want to implement a cross-platform USB application, really your best bet is to write an abstract JNI interface that talks to Linux, Mac and Windows native libraries that you'll have to write yourself. I'd look at LibUSB to handle Mac and Linux. Windows, as you've seen, is pretty straightforward. I just came off a year-long project that did just this, and unfortunately this is the only serious cross-platform solution. If you don't have to implement on Windows and your needs are limited, you may get by with one of the older Java libs (jUSB or Java-USB). Anything that needs to deploy on Win32/Win64 will need a native component.

Been using usb4java for a year on cross platfom (Linux and Windows) and it works great.

See:

http://usb4java.org/

They are very active and have a very good javax USB front.

You might want to have a look at usb4java - http://usb4java.org/index.html it appears to support Windows, Linux and Mac OS's and appears to be reasonably current at the time of posting. Is unfortunately under the LGPL so may not be suitable for commercial development.