package hello;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.util.MessageResources;
public final class HelloAction extends Action {
/**
* Process the specified HTTP request, and create the corresponding HTTP
* response (or forward to another web component that will create it).
* Return an <code>ActionForward</code> instance describing where and how
* control should be forwarded, or <code>null</code> if the response has
* already been completed.
*/
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception {
// These "messages" come from the ApplicationResources.properties file
MessageResources messages = getResources(request);
/*
* Validate the request parameters specified by the user
* Note: Basic field validation done in HelloForm.java
* Business logic validation done in HelloAction.java
*/
ActionMessages errors = new ActionMessages();
String userName = (String)((HelloForm) form).getUserName();
String badUserName = "Monster";
if (userName.equalsIgnoreCase(badUserName)) {
errors.add("username", new ActionMessage("hello.dont.talk.to.monster", badUserName ));
saveErrors(request, errors);
return (new ActionForward(mapping.getInput()));
}
/*
* Having received and validated the data submitted
* from the View, we now update the model
*/
PersonBean pb = new PersonBean();
pb.setUserName(userName);
pb.saveToPersistentStore();
/*
* If there was a choice of View components that depended on the model
* (or some other) status, we'd make the decision here as to which
* to display. In this case, there is only one View component.
*
* We pass data to the View components by setting them as attributes
* in the page, request, session or servlet context. In this case, the
* most appropriate scoping is the "request" context since the data
* will not be neaded after the View is generated.
*
* Constants.PERSON_KEY provides a key accessible by both the
* Controller component (i.e. this class) and the View component
* (i.e. the jsp file we forward to).
*/
request.setAttribute( Constants.PERSON_KEY, pb);
// Remove the Form Bean - don't need to carry values forward
request.removeAttribute(mapping.getAttribute());
// Forward control to the specified success URI
return (mapping.findForward("SayHello"));
}
}
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