Form Bean java class will be verified if it is not found then error message will be reported. If the class is found then RequestProcessor instantiates that class and puts it in appropriate scope - either Session or Request. The RequestProcessor determines the appropriate scope by looking at the scope attribute in the same ActionMapping.
The RequestProcessor checks for the "validate" attribute in the ActionMapping. If the validate is set to true, the RequestProcessor invokes the validate method on the EmpForm instance. These Beans are automatically made visible to your controller components like LoginAction and any view page that is associated with that controller. These Beans can also be validated with the help of the Struts system to help insure that the user is putting good data in the form.
They can be carried along with a session, allowing forms to span multiple pages of the view, and Actions in the controller. Struts works on the server side, so the client's view has to be composed there. Within your web application will be pages that represent the view your users will see. A set of JSP tags is bunded with the Struts distribution so that you can get started right away, but any standard presentation technology can be used with Struts.
Even plain HTML files can be used within your Struts application, although they will not take full advantage of all of the dynamic features. Following the example of the Struts JSP taglibs, several other packages are available to make the framework easy to use with your favorite presentation technology.
These packages make the standard Struts framework elements look and feel like a seamless part of the original presentation technology. Struts also makes it easy to mix and match. Since Struts relies on standard Servlet technologies, you should be able to use any Java presentation technology with Struts.
While the focus of the Struts framework is on the controller, the presentation layer is a significant part of any application. Edit Profile. Sign Out View Profile. Over 2 million developers have joined DZone. Like 3. Join the DZone community and get the full member experience. Join For Free. An ActionForm is also called JavaBean. ActionForm maintains the session state for web application and the ActionForm object is automatically populated on the server side with data entered from a form on the client side.
Struts Framework provides the functionality to validate the form data. It can be use to validate the data on the users browser as well as on the server side. Struts Framework emits the java scripts and it can be used validate the form data on the client browser. Server side validation of form can be accomplished by sub classing your From Bean with DynaValidatorForm class.
The Validator framework was developed by David Winterfeldt as third-party add-on to Struts. Now the Validator framework is a part of Jakarta Commons project and it can be used with or without Struts. The Validator framework comes integrated with the Struts Framework and can be used without doing any extra settings. 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.
How to solve these Java Interview Questions and Answers? 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 STRUTS Interview Questions and Answers What is Action Class?
Write your comments here:.
0コメント