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.
Do you mean: who do I access the web server layer from a web page directly, without a GET/POST? It is tempting to think that you can access a bean in a JSP directly, i.e. without a POST or GET, because all the code is in one JSP; but the JSP lives on the servlet, and the HTML is produces is sent to the client (over HTTP). So if the former is what you mean, the answer is no. Otherwise, please elaborate your question please.