There is a way of getting the minecraft game source code (that's how mods are made) which you could edit so it sends data to your website,
you can use this program to decompile the game code and output source files:
Minecraft Coder Pack - Minecraft Wiki
It also decompiles the server, which will be very useful for what your trying to do, it will be quite hard and I'm afraid I can't help you from there as I'm not very good at modding, you should probably follow some basic modding tutorials to give you an idea of how to do the basics before setting off on this. Good luck!