Custom Error message in Login Page

Question

Hi,
I am using MVC framework for my project. I want to display custom error messages to the user in the Login page(JSP).
For eg: invalid password, password has been expired etc. How do I pass these messages from Java to my login page & display it?

Answer 1

This is a sample action class for login page in struts : -
package xxx;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import LoginForm.java;
public class Action extends org.apache.struts.action.Action
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
ActionErrors errors = new ActionErrors();
ActionForward forward = new ActionForward(); // return value
String username;
String password;
try {
LoginForm lf = new LoginForm;
username =lf.getUserName();
password = lf.getPassword();
if( username== null)
forward=mapping.getInputForward();
if( (username == "admin" ) && ( password="admin"))
// do something here
} catch (Exception e) {
// Report the error using the appropriate name and ID.
//Errors will be caught here.
errors.add("name", new ActionError("id"));
// If a message is required, save the specified key(s)
// into the request for use by the <struts:errors> tag.
if (!errors.isEmpty()) {
saveErrors(request, errors);
// Forward control to the appropriate 'failure' URI (change name as desired)
//     forward = mapping.findForward("failure");
} else {
// Forward control to the appropriate 'sucuess' URI (change name as desired)
forward = mapping.findForward("success");
// Finish with
return (forward);
You need to have LoginForm.java as Model and Login.jsp as View . Action.java will be your controller.