What are Java's native ways of communicating with devices directly?

Question

What are Java's native ways of communicating with devices or ports such as LPT1, COM1, USB directly?

Answer 1

native means unportable, so you have to mess with JNI or JNA if and only if the following libraries doesn't works for you:

• javacomm for serial ports
• jUSB for USB

Answer 2

RXTX is good one for COM and LPT ports. USB is extremely difficult; probably the easiest way is to write your own C+JNI wrapper for native drivers of the device.

Answer 3

Unfortunately, in Javax.comm the sun version 2.0 and the latest RXTX versions -- LPT parallel ports are not implemented properly under Win32. Output seems to work okay, but if you try to read from the port it's not possible.