Handling double form submissions in Struts2

 
Double form submissions(either by refreshing or by hitting the browser back button) can be irritating and in some cases leads to big problem .Luckly struts2 has a build in functionality that prevents such scenarios :<s:token/> tag and token interceptor. As an example, let’€™s say that we have a form that looks like this:
 

 
** UPDATE: Struts 2 Complete tutorial now available here.
 
In order to prevent double submissions all we have to do is to add tag in the above form. This tag will add a unique identifier in the form that will be used later from the token interceptor in order to check if the form is submitted for the first time or not. In case the form is not submitted for the first time, interceptor’s result will be “invalid.token”.
 

/inputPage.jsp
/invalidToken.jsp
/successPage.jsp

Note that “invalid.token” result in the above action declaration actually means that in the case of invalid token the user should be redirected in invalidToken.jsp
 
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