File	Doc	Category	Size	Date	Package
LogonAction.java	API Doc	Example	8389	Sun Mar 21 10:32:18 GMT 2004	org.apache.struts.webapp.example

LogonAction

• java.lang.Object
  • org.apache.struts.action.Action

Fields Summary
private Log	log The Log instance for this application.

Constructors Summary

Methods Summary
public org.apache.struts.action.ActionForward	execute(org.apache.struts.action.ActionMapping mapping, org.apache.struts.action.ActionForm form, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Process the specified HTTP request, and create the corresponding HTTP response (or forward to another web component that will create it). Return an ActionForward instance describing where and how control should be forwarded, or null if the response has already been completed. param mapping The ActionMapping used to select this instance param form The optional ActionForm bean for this request (if any) param request The HTTP request we are processing param response The HTTP response we are creating exception Exception if business logic throws an exception // --------------------------------------------------------- Public Methods // Extract attributes we will need Locale locale = getLocale(request); MessageResources messages = getResources(request); User user = null; // Validate the request parameters specified by the user ActionErrors errors = new ActionErrors(); String username = (String) PropertyUtils.getSimpleProperty(form, "username"); String password = (String) PropertyUtils.getSimpleProperty(form, "password"); UserDatabase database = (UserDatabase) servlet.getServletContext().getAttribute(Constants.DATABASE_KEY); if (database == null) errors.add(ActionErrors.GLOBAL_ERROR, new ActionError("error.database.missing")); else { user = getUser(database, username); if ((user != null) && !user.getPassword().equals(password)) user = null; if (user == null) errors.add(ActionErrors.GLOBAL_ERROR, new ActionError("error.password.mismatch")); } // Report any errors we have discovered back to the original form if (!errors.isEmpty()) { saveErrors(request, errors); return (mapping.getInputForward()); } // Save our logged-in user in the session HttpSession session = request.getSession(); session.setAttribute(Constants.USER_KEY, user); if (log.isDebugEnabled()) { log.debug("LogonAction: User '" + user.getUsername() + "' logged on in session " + session.getId()); } // Remove the obsolete form bean if (mapping.getAttribute() != null) { if ("request".equals(mapping.getScope())) request.removeAttribute(mapping.getAttribute()); else session.removeAttribute(mapping.getAttribute()); } // Forward control to the specified success URI return (mapping.findForward("success"));
public User	getUser(UserDatabase database, java.lang.String username) Look up the user, throwing an exception to simulate business logic rule exceptions. param database Database in which to look up the user param username Username specified on the logon form exception ModuleException if a business logic rule is violated // Force an ArithmeticException which can be handled explicitly if ("arithmetic".equals(username)) { throw new ArithmeticException(); } // Force an application-specific exception which can be handled if ("expired".equals(username)) { throw new ExpiredPasswordException(username); } // Look up and return the specified user return ((User) database.findUser(username));