Matt RaibleMatt Raible is a Web Developer and Java Champion. Connect with him on LinkedIn.

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Over 10 years ago, I wrote my first blog post. Since then, I've authored books, had kids, traveled the world, found Trish and blogged about it all.

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Sunday March 14, 2004

[Struts Menu] Building Dynamic Menus from a database table

I spent a few hours this weekend and did some work on Struts Menu. At the very least, I made it easier to build dynamic menus programmatically and put together an example of doing it from a database table. I also added support for Expression Language (EL) syntax in all the tag's attributes. For the EL implementation, I simply copied what was implemented in the DisplayTag. I don't know that it's the best way (two TLDs, subclassing tag classes), but it works and it is good enough for now. The main reason I copied the implementation in the DisplayTag is that we've been talking about adding support for OGNL. I figure if I copy the implementation, it should be easy enough to copy the refactorying if/when it happens.

Back to the point of this post - how do you build dynamic menus? So without further ado, here's how to build and display database-driven menus with Struts Menu.

Posted in Java at Mar 14 2004, 04:53:33 PM MST 4 Comments
Comments:

Hey Matt, thank you very much. I always get here to find answers to my questions. You're not a guru (and don't pretend to be), but a down to earth guy, who likes to share his knowdledge with the rest of us.

Posted by Ale from Argentina on March 15, 2004 at 09:53 AM MST #

Thanks for the info Matt. I always enjoy gleaning your 'nuggets of knowledge'. As for your comment in your scriplet code pertaining to retrieving the static menus defined in the default MenuRepository, I use the following with Struts Menu 2.0 in a utility class with no problems: MenuRepository myMenuRepository = (MenuRepository)session.getServletContext().getAttribute( MenuRepository.MENU_REPOSITORY_KEY );

Posted by Paul on March 15, 2004 at 10:30 AM MST #

Hi Matt, I'm doing doing my dynamic menus in a way quite close to yours : - I'm using CoolMenus too - I'm using a Tiles JSP fragment, instead of a taglib - I'm using EJBs (CMP 2.O) to generate the menus. It's really fast, even with more than 100 items (it needs a little bit of tuning of course to achieve this). - I'm caching the Menu in the user's Session, for better performance (I might use OSCache in the future) - I'm managing the permissions by using the user's JAAS roles, like you do. However, I don't need any mapping, because my Menu EJB is linked to the Role EJB. So I have less configuration than you have with StrutsMenu.

Posted by Julien Dubois on March 15, 2004 at 02:29 PM MST #

where is CODE?

Posted by 207.45.248.20 on October 30, 2007 at 04:59 AM MDT #

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