What is the difference between dynaactionform and actionform in struts

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In addition, the same type of form field may appear in different The form, and then appear in multiple ActionForm, which will cause multiple Act The same verification code cannot be shared between ionForm classes, for example: there are user and password fields in the login page, and there are password and user fields in the nursery rhyme on the registration page.

The corresponding names and operations should be similar. Of course, consider developing a suspicious one The huge ActionForm class makes it correspond to multiple forms at the same time, but this excessive aggregation will make the code more difficult to maintain and reuse.

In order to completely solve this problem, Struts1. In fact, the purpose of introducing dynamic form DynaActionForm is to reduce the number of ActionForm, so ActionForm is often called static form to show the difference.

In the previous article, I mentioned the definition of the system's custom form, which is actually inaccurate. 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.

Even better, the business objects could be handed to the action at runtime IoC style thus removing any dependencies on the model. The return type of the execute method is ActionForward which is used by the Struts Framework to forward the request to the file as per the value of the returned ActionForward object. ActionForm is called ActionForm.

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. You will provide properties to hold the state of the form with getters and setters to access them.

The DynaActionForm bloats up the Struts config file with the xml based definition.