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The following page has been changed by MichaelJouravlev: http://wiki.apache.org/struts/StrutsManualActionClasses ------------------------------------------------------------------------------ Action class provides only one method to deal with all incoming requests, therefore actions rarely distinguish a ''render request'' from a ''submit request''. This often leads to convoluted and unmaintable code that can break from an occasional page refresh or from clicking on a Back button. + inline:setup_submit.gif + Despite its shortcomins, the "servlet mode" is one of more popular uses of Action class.A typical Action class will often implement logic like the following in its execute method: * Validate the current state of the user's session (for example, checking that the user has successfully logged on). If the Action class finds that no logon exists, the request can be forwarded to the presentation page that displays the username and password prompts for logging on. This could occur because a user tried to enter an application "in the middle" (say, from a bookmark), or because the session has timed out, and the servlet container created a new one. @@ -30, +32 @@ * Perform the processing required to deal with this request (such as saving a row into a database). This can be done by logic code embedded within the Action class itself, but should generally be performed by calling an appropriate method of a business logic bean. * Update the server-side objects that will be used to create the next page of the user interface (typically request scope or session scope beans, depending on how long you need to keep these items available). * Return an appropriate ActionForward object that identifies the presentation page to be used to generate this response, based on the newly updated beans. Typically, you will acquire a reference to such an object by calling findForward on either the ActionMapping object you received (if you are using a logical name local to this mapping), or on the controller servlet itself (if you are using a logical name global to the application). - - In Apache Struts 1.0, Actions called a perform method instead of the now-preferred execute method. These methods use the same parameters and differ only in which exceptions they throw. The elder perform method throws SerlvetException and IOException. The new execute method simply throws Exception. The change was to facilitate the Declarative Exception handling feature introduced in Apache Struts 1.1. - - The perform method may still be used in Apache Struts 1.1 but is deprecated. The Apache Struts 1.1 method simply calls the new execute method and wraps any Exception thrown as a ServletException. The deprecated perform method was removed in Apache Struts 1.2. == Action As A Behavior Object ==
