This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
JBoss Developer Studio is based on Eclipse - you should be able to import your Eclipse project into JBDS. Hopefully your project is in a repository and you can extract it from there. If not, and it only exists on disk, then use File | Import | General | Existing Projects Into Workspace. (I hope this answers you question - it was fairly vague and could be interpreted in many different ways.)