Understanding Struts Action Class
An Action class in the struts application extends Struts
'org.apache.struts.action.Action" Class. Action class acts as wrapper around the
business logic and provides an interface to the application's Model layer. It acts as
glue between the View and Model layer. It also transfers the data from the view layer
to the specific business process layer and finally returns the processed data from
business layer to the view layer.
An Action works as an adapter between the contents of an incoming HTTP request and
the business logic that corresponds to it. Then the struts controller (ActionServlet)
selects an appropriate Action and creates an instance if necessary, and finally calls
execute method.
To use the Action, we need to Subclass and overwrite the execute() method. In the
Action Class don't add the business process logic, instead move the database and
business process logic to the process or db layer.
The ActionServlet (command) passes the parameterized class to Action Form using the
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. Our Action class returns the ActionForward called "testAction", which
is defined in the struts-config.xml file (action mapping is show later in this page).
Here is code of our Action Class:
Tes t Ac ti on .j av a
package SturtsTest02;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
public class Tes tAc ti on extends Action
{
public ActionForward execute(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
Comment [1]: start source code
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