Struts when is reset called




















I was trying to put a checkbox on the page, and you know it: unchecked checkboxes are not written to the request only checked boxes are. HttpServletRequest request. The reset method is automatically called by the Struts framework your observation on The Elite Gentleman's answer is correct If we are not using reset method when that time we are trying to open our application then previous values will be coming automatically. If we are using this reset method the previous values will be reset into empty values.

So by using this reset method we can avoid previous values. Reset is never called by default, you have to call it through your actions if you want to reset your form ,. If you add any files,it will delete all existing files related to this question- questions only answer remains unchanged. Your request will be Queued.

It is the look of the application. The view can access the model getters, but it has no knowledge of the setters. In addition, it knows nothing about the controller. The view should be notified when changes to the model occur. Controller: The controller reacts to the user input. It creates and sets the model. Framework is made up of the set of classes which allow us to use a library in a best possible way for a specific requirement.

Jakarta Struts is robust architecture and can be used for the development of application of any size. Struts framework makes it much easier to design scalable, reliable Web applications with Java. ActionServlet is the called the ActionServlet. ActionServlet performs the role of Controller: Process user requests Determine what the user is trying to achieve according to the request Pull data from the model if necessary to be given to the appropriate view, Select the proper view to respond to the user Delegates most of this grunt work to Action classes Is responsible for initialization and clean-up of resources.

Any java class which extends from org. Action is called Action class. The Action is part of the controller. To use the Action, we need to Subclass and overwrite the execute method.

The ActionServlet commad passes the parameterized class to Action Form using the execute method. There should be no database interactions in the action. The action should receive the request, call business objects which then handle database, or interface with J2EE, etc and then determine where to go next.

The requirement was that the solution be easily added to any action that the programmer felt needed it. I thought to myself, "Self, given Struts' page flow flexibility and general extensibility, there's got to be a way to do this elegantly". I couldn't really find anything on the web that showed a satisfactory solution. When I finally came up with a solution, I was surprised that the Struts package didn't already come with a feature like it. Once you've implemented the steps above, it's just a matter of doing step 1 whenever you want to add a 'Please Wait' page to your action.

It's that simple! Here's a sample action mapping in struts-config. What is Struts going to do with it? As you may know, all incoming client requests go through the Struts ActionServlet then over to the Struts RequestProcessor class. Depending on your configuration, this class then forwards to the appropriate Struts Action class for your actual business processing. But we don't want Struts to go right to our action just yet.



0コメント

  • 1000 / 1000