My attention is to prevent duplicated submission.
I have refered to the struts-example.
It checks the valid of token by IsValidToken().
However when a form is displayed at the first time,
it always is invalid.
Moreover, according to the struts-example, it
saveToken when it finds error.
The behavior becomes very strange.
When a form is displayed at the first time, it is
invalid. It leads to error message displaying on web
page. Next time user clicks the submit button, it
becomes valid. Then it cannot avoid duplicated
submission.
All I want is very simple. When user clicks a submit
button. It saves record if data checking is ok.
If user goes back and re-click the submit button.
Duplicated submission should be detected.
Below is my codings. What needs to be changed
so that duplicated submission can be avoided?
package com.erp.quotation;
import java.util.Locale;
import org.apache.struts.action.*;
import javax.servlet.http.*;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.util.MessageResources;
public final class AddUserProfileAction extends Action
{
private Log log =
LogFactory.getFactory().getInstance(this.getClass().getName());
public ActionForward execute (ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception {
if (isCancelled(request)) {
if (log.isInfoEnabled()) {
log.info(" " + mapping.getAttribute() + "
- Registration transaction was cancelled");
}
removeFormBean(mapping, request);
return mapping.findForward("cancel");
}
HttpSession session = request.getSession();
ActionErrors errors = new ActionErrors();
if (log.isTraceEnabled()) {
log.trace(" Checking transactional control
token");
}
if (!isTokenValid(request)) {
log.trace("valid token");
errors.add(ActionErrors.GLOBAL_ERROR,
new
ActionError("error.transaction.token"));
} else {
log.trace("invalid token");
}
resetToken(request);
Locale locale = getLocale(request);
MessageResources messages =
getResources(request);
String action = request.getParameter("action");
if (checking_is_ok) {
save_record_to_database();
ActionMessages actionMessages = new
ActionMessages();
ActionMessage actionMessage = new
ActionMessage("statusLine.recordAdded");
actionMessages.add(Constants.statusLine,
actionMessage);
saveMessages (request, actionMessages);
saveToken(request);
addUserProfileForm.reset(mapping, request);
return mapping.findForward("success");
}
// Remove the obsolete form bean
if (mapping.getAttribute() != null) {
if ("request".equals(mapping.getScope()))
request.removeAttribute(mapping.getAttribute());
else
session.removeAttribute(mapping.getAttribute());
}
if (!errors.isEmpty()) {
saveErrors(request, errors);
saveToken(request);
return (mapping.getInputForward());
}
return mapping.findForward("failure");
}
}
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