Jason, EJB's and JavaBeans are used to move the business logic of your application out of the presentation layer (JSP) and into the model in the MVC architecture. The JSP is the view in this architecture. EJB's and JavaBeans can be used to encapsulate persistent data such as a database record. JavaBeans are also typically used to encapsulate form data. By putting form data in a bean, you can have a form be prepopulated with data that has been entered previously. This is useful when you have a series of form inputs or when you validate form input data and need to display a page again because the user skipped a mandatory field. EJB's can be used for several different purposes such as maintaining session values or storing a database record for display by a JSP. EJB's and JavaBeans are used to hold data that is displayed by the view.
It is not a good practice to put a lot of control logic or other code in a JSP. The code should reside in EJB's, JavaBeans, custom tags, or controller servlets. Regards, Richard At 12:31 PM 10/30/01 +0800, you wrote: >To All JSP Interest, > > First, thank you for Andrew and Richard answer my previous question? > > My second question is what is the role of EJB or JavaBean in JSP? If >possible, please give me an example. > I know that in JSP I can use the package JDK included and some others. >Then, why I need EJB or JavaBean? > >Thank you, > >Jason > >=========================================================================== >To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff >JSP-INTEREST". >For digest: mailto [EMAIL PROTECTED] with body: "set JSP-INTEREST DIGEST". >Some relevant FAQs on JSP/Servlets can be found at: > > http://archives.java.sun.com/jsp-interest.html > http://java.sun.com/products/jsp/faq.html > http://www.esperanto.org.nz/jsp/jspfaq.jsp > http://www.jguru.com/faq/index.jsp > http://www.jspinsider.com =========================================================================== To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff JSP-INTEREST". For digest: mailto [EMAIL PROTECTED] with body: "set JSP-INTEREST DIGEST". Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com
