如何刷新已在jsf中预先插入的表单值？

Question

In my application, I am adding form data in database on click of submit button.But the problem is, when user refreshes the page, the data added one more time into the database and so on...

What can be the solution for this, please some body give me good link/solution for this problem...

Thanks a lot.

Code :

<h:commandButton value="Submit" action="#{co.createAction()}" />

public String createAction() {
  if (login.registerUser().equals("success")) {
    return "index?faces-redirect=true";
  } else {
    return "failure";
  }
}

public String registerUser() {
  if (serv.createRegUser(reg)) {
    return "success";
  } else {
    return "failed";
  }
}

public boolean createRegUser(Registration reg) { 
  try { 
    initJpa(); 
    regJpa.create(reg); 
    return true; 
  } catch(Exception e) { 
    e.printStackTrace(); 
    return false; 
  } 
}

Answer 1

Also avoid using void methods in JSF. If you want to return back to same page use the same page viewid. Try to put the following code:

public String submit() {
    // ...

    return "viewid?faces-redirect=true";
}

The reference is taken from this link .

Answer 2

This could be caused by several factors :

1 - Your function adding the item in the database is called each time the view is displayed.

This could be caused by a @PostConstruct annotation on the aforesaid method. This could also be caused by an element calling this method from the view.

2 - Your method for inserting object in database is persisting 2 objects

3 - Your form is submitted more than once

4 - You inserted a second object if the DB when you observed