Action classes respond to a user action, execute business logic (or call upon other classes to do that), and then return a result that tells Struts what view to render. Struts 2 Action classes usually extend the ActionSupport class, which is provided by the Struts 2 framework.
Table of Contents
What is action class Struts2?
Action classes respond to a user action, execute business logic (or call upon other classes to do that), and then return a result that tells Struts what view to render. Struts 2 Action classes usually extend the ActionSupport class, which is provided by the Struts 2 framework.
How exceptions are handled in Struts application?
There are two methods for handing uncaught exceptions in Struts: Global exception handling: specifies exception mappings (exception type – view name) which apply to all action classes in a Struts package. Exception handling per action: specifies exception mappings which apply to a specific action class.
What are the ways to implement define an action class in Struts?
In simple steps, we will see how to use Action class.
- First extend the org. apache. struts. action.
- Override the following method. public ActionForward execute(ActionMapping mapping, ActionForm form,
- Then we configure this action to struts config file of our application inside action mapping :
What is interceptors in Struts 2?
Interceptor is an object that is invoked at the preprocessing and postprocessing of a request. In Struts 2, interceptor is used to perform operations such as validation, exception handling, internationalization, displaying intermediate result etc.
How declarative exceptional handling performs in a Java application?
The biggest benefit of Declarative Exception Handling is if there is requirement to change the exception handling mechanism, changes can be made to the xml file, without recompilation of java code. The declarative exceptions can be placed as action-specific or global.
What is ActionSupport in Struts 2?
public class ActionSupport extends Object implements Action, Validateable, ValidationAware, TextProvider, LocaleProvider, Serializable. Provides a default implementation for the most common actions. See the documentation for all the interfaces this class implements for more detailed information.
What are the main classes which are used in Struts application?
Core classes of the Struts Framework
- ActionServlet.
- ActionForm.
- Action.
- Action Mapping.
- ActionForward.
What is an action class?
Actions class is an ability provided by Selenium for handling keyboard and mouse events. In Selenium WebDriver, handling these events includes operations such as drag and drop, clicking on multiple elements with the control key, among others. These operations are performed using the advanced user interactions API.
What is Valuestack in Struts2?
The Value Stack The value stack is a set of several objects which keeps the following objects in the provided order − Sr.No. Objects & Description. 1. Temporary Objects.
What is defaultStack interceptor in Struts2?
The interceptor-stack element is used to create an interceptor stack. A stack contains a group of interceptors. Each interceptor in the stack is defined using the interceptor-ref element. In this example we will create a stack similar to the defaultStack and customise the validation interceptor according to our need.
How many types of exceptions are there in Java?
There are mainly two types of exceptions in Java as follows: Checked exception. Unchecked exception.
What is COM Opensymphony xwork2?
opensymphony. xwork2. ActionSupport), a very powerful and convenience class that provides default implementation of few of the important interfaces : public class ActionSupport implements Action, Validateable, ValidationAware, TextProvider, LocaleProvider, Serializable { }
Which one is a controller class in Struts?
The struts Action class is effectively the Controller as it determines what should happen next in the processing of the request (from the browser). The Action class has an execute method that contains the controller logic. The Action class is a good example of the use of Command Pattern.
What are advantages of Struts 2 over Struts 1?
7. Advantages of Struts2
- Simplified Design: Code is not tightly coupled to Struts framework or Servlet API.
- Easy plug-in: Developers can use other technologies plug-in easily.
- Simplified ActionForm: ActionForms are POJOs, we do not need to implement any interface or extend from any class.
What is xOffset and yOffset in Selenium?
Both xOffset and yOffset represent the relative pixel distance (integer) with which to scroll. For xOffset , positive value means to scroll right, and negative value means to scroll left. For yOffset , positive value means to scroll downward, and negative value means to scroll upward.
What is the difference between action and actions?
With the above explanations of Actions Class & Action Class, we can now conclude that Actions is a class that is based on a builder design pattern. This is a user-facing API for emulating complex user gestures. Whereas Action is an Interface which represents a single user-interaction action.