What are action classes in Struts?
Action Class in Struts framework defines the business logic. An action class handles the client request and prepares the response. It also decides where the response should be forwarded. Basically an action class receives data from the presentation layer and forwards the data to the corresponding business layer.
Which servlet does the Struts framework use?
When you use Struts, the framework provides you with a controller servlet, ActionServlet , which is defined in the Struts libraries that are included in the IDE, and which is automatically registered in the web. xml deployment descriptor as shown below.
How many servlet controllers are used in a Struts application?
How many servlet controllers are used in a Struts Application? Ans: Struts framework works on the concept of centralized control approach and the whole application is controlled by a single servlet controller. Hence, we require only one servlet controller in a servlet application.
What is action class and Actionform?
Action classes are defined to handle request. Actions exist between Model and view of an application. The struts-config.xml file designates the Action classes that handle requests for various URLs. The struts-config.xml file then decides which JSP page should apply to that situation.
How do you call Struts action?
Struts 2 “action” tag is used to call action class directly from a JSP page. if the “executeResult” attribute is set to true, the content of the result page will be rendered directly in the current page.
What is form bean in Struts?
When a user clicks the Submit button on an HTML form built with Struts, the data from that form is populated into a Java bean called a form bean. A form bean has properties that match up with all the fields on the form. When the form is submitted, the bean properties are automatically populated.
What is ActionForm?
An ActionForm is a JavaBean optionally associated with one or more ActionMappings. Such a Bean will have had its properties initialized from the corresponding request parameters before the corresponding action’s execute() method is called.
How does struts2 validation work?
Struts Action 2 relies on a validation framework provided by XWork to enable the application of input validation rules to your Actions before they are executed. Validator uses XML configuration files to determine which validation routines should be installed and how they should be applied for a given application.
How are struts actions similar to a servlet?
Actions have a life cycle similar to servlets. They are like servlets and they’re multithreaded. We must be careful when working with member variables of an action because they are not thread safe. Strutshas a servlet called the ActionServlet.
What does Struts 2 action mean in Java?
Struts 2 Action. In struts 2, action class is POJO (Plain Old Java Object). POJO means you are not forced to implement any interface or extend any class. Generally, execute method should be specified that represents the business logic.
How are action classes used in Apache Struts?
Apache Struts is an open source framework used to develop JSP or servlet based web application. Struts extend the Java servlet API and are based on the model view controller or MVC design pattern. Action Class in Struts framework defines the business logic. An action class handles the client request and prepares the response.
What is the return type of struts execute method?
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. Developing our Action Class? Our Action class (TestAction.java) is simple class that only forwards the TestAction.jsp.