How to ban an IP Address to access my Server

Hello,
I am implementing a firewall for HTTP server.once i start my Jetty 
HTTP server then anyone can access my server with ipaddress followed 
by :8080.I think iam right so far.

now I want to block a machine to access my HTTP server,which is 
blocking a specific IP address to access the server.
how can I do that.please help me with that.

Please reply asap.
Thank You.
Regards.
Ratan


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