How can i restrict user from accessing my Web Application?

Hello, i want to access my web application only with in the local network. I don't want any user access web application out side the local network.
Please give me some suggestions how can i do this. I am using jsp,javascript,sqlserver and tomcat as server.

You may configure a firewall [that fill filter out requests from IP addresses outside your network].

thanks for reply karthi,
i have to deploy application to client and its an agreement that my client will access that application only within local network. so i have to apply restriction within source code.

Then you may get the client IP from the HTTP request and verify if it is within the permissible range [using some configuration files]

I can not hardcode all IP addresses of network, what if new system attached or IP address changed of some computer.Can not i check on domanin or proxy etc? or something like that?