java - How do you make a jar file that needs to be verified? -


i have been making lot of software in java , have of software executable .jar files. came idea of selling software , make website php, html, css, , mysql eventually.

anyways, have wanted make system buys license software online , gets registration code. there copy of software on website , when download , run (for first time), prompt enter registration code.

i want figure out how make one-time prompt executable .jar file communicates servers, checks code see if in 1 of mysql tables, , sends response jar file, letting know if code valid. if is, activates software. need know how user deactivate software if wish have software registered on different computer.

if show me example or point me tutorial, nice. thanks.


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