How to load themes from a database in Spring MVC based on user-agent , etc

I am brand new to Spring web MVC. I am trying to create a simple 1 paged site that will check the users browser and display the current theme f开发者_运维知识库or that browser.

If its a mobile app, I need to allow the user a button to switch to the regular site.

Also the current theme for mobile and non-mobile is stored in a database, which includes the start date, end date and the theme name. The theme name is the folder where the theme's resources are located.

Being a beginner I have never used themeresolver.

Your help is much appreciated.

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ThemeResolver is reasonably straightforward to implement.

You won't be using the setThemeName() method, so have it throw an UnsupportedOperationException. Your resolveThemeName() method would:

1. Get "User-Agent" request header and determine the appropriate theme.
2. Run a DB query (you may want to cache this).
3. Return theme name.

You'll then need to declare your implementation under 'themeResolver' name in your application context.