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Below you will find an example of Flash Attributes usage, before you start reviewing it, read Using flash attributes section of Spring documentation.
Suppose that we have two controllers: AController and BController, first one will prepare some data and pass to the second using Flash Attributes after the form submission. On the AController we will have something like this:
@RequestMapping(method = RequestMethod.POST)
public String handleFormSubmission(..., final RedirectAttributes redirectAttrs) {
...
redirectAttrs.addFlashAttribute("AttributeName", value);
return "redirect:to_some_url_handled_by_BController";
}
@Controller
...
@SessionAttributes("AttributeName")
public class SearchCriteriaHandler {
...
@RequestMapping(method = RequestMethod.GET)
public void handleGetRequest(@ModelAttribute("AttributeName") final SomeType value) {
...
}
...
}
Before your handler method will be called, Spring Framework will populate the Model with the available Flash Attributes - at this point value passed from AController will become a model attribute for the BController. Note, that because we also defined this attribute as the Session Attribute, it will be automatically stored for future usage within this controller, after the GET request handling.
Let me say that I was waiting for this feature for the long time, ;)
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