I've set up a login page for my site, and I've used the ValidationAware
interface on LoginAction in order to display errors on the login form
when the user name or password is incorrect. However, this has one
unintended result: the first time the user navigates to
"server.com/webapp/login.action", the page already displays errors for
missing fields.
Is there a way to prevent the validation from firing unless the user is
coming back to it after attempting to log in? My first thought is to
have another action defined in struts.xml, whose result would just be a
redirect to login.jsp, but it seems like there should be a solution that
doesn't introduce extra actions into the config. (In general, it's a
personal preference to keep XML files as small and simple as possible.)
Thanks,
~Dan Allen
struts.xml excerpt:
<action name="login" class="loginAction"> <!-- class is
instantiated by Spring, hence no qualified classname -->
<result name="input">/jsp/login.jsp</result>
<result
name="success">/jsp/redirect.jsp</result>
</action>
LoginAction.java
@SuppressWarnings("unchecked")
public class LoginAction extends ActionSupport implements
ValidationAware, Validateable, SessionAware {
private String userName = null;
private String password = null;
private String redirectDesintation = null;
public LoginChecker loginChecker = null;
private Map sessionAttributes = null;
@RequiredStringValidator(message="A valid user name is required
to log in.")
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserName() {
return this.userName;
}
@RequiredStringValidator(message="You must enter your password
to log in.")
public void setPassword(String password) {
this.password = password;
}
public String getPassword() {
return this.password;
}
// For Spring to provide us with the appropriate implementation.
public void setLoginChecker(LoginChecker checker) {
this.loginChecker = checker;
}
@Override
public void setSession(Map sessionAttributes) {
this.sessionAttributes = sessionAttributes;
}
public String execute() {
// If we made it past the validation, then there's
really nothing else to do except
// send the user on to wherever s/he was going, via the
JSP.
// If we don't know where s/he was going, default to the
index.
if(redirectDesintation == null ||
redirectDesintation.equals(""))
redirectDesintation = "index.action";
return SUCCESS;
}
@Override
public void validate() {
User result = loginChecker.checkLogin(userName,
password);
// If log-in failed, add the action error
if(result == null) {
addActionError("The submitted user name and
password combination was invalid.");
}
// If it succeeded, set the User object in the session.
else {
sessionAttributes.put(MidasUtils.USER_IN_SESSION, result);
}
}
}
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