There are a lot of ways to accomplish this and this is not specific to JIRA itself. You can do this with any application if you use a proxy in front of the application.
I have followed the below document and how ever , its not working for me.
Specially i did not understand this step "Start the other "Maintenance" service (which is still on port 80)"
https://confluence.atlassian.com/confkb/how-to-create-a-maintenance-splash-page-290751207.html
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