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Struts is an open source framework that facilitates the development of web applications based on Java servlets and other related technologies

lthough Struts greatly facilitates the task of developers, it doesn't do much to improve the end-user experience: the end-result is still an application delivered in HTML and using the traditional HTTP request/response mechanism.

Developers—and organizations in general—are increasingly looking for solutions to provide their applications with a more engaging user experience that overcomes the limitations of HTML.Macromedia Flex is a presentation server that addresses this requirement and allows developers to build a new generation of Rich Internet Applications (RIAs) that combine the usability of desktop applications with the reach of traditional web applications.

To See more information:
http://www.adobe.com/devnet/flex/articles/struts.html