how to create a webbase administration console for a java server
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I have a java server program and created a java desktop base administration console to view connected clients, gather statistics of the server, etc. My question is how to make a web-base administration console or any simple reference to start with.
An example of what I want to do is Openfire which is opensource but it looks advance in my current knowledge so if possible I would like to start with a simple one and build from there. 

Thanks for your responses.