java - What are ways for pass parameters from controller after redirect in spring mvc?

Question

if I write in mycontroller method:

return  "redirect:url";

What parameters will passes to url(it maybe controler method or jsp page) ?

Answer 1

With RedirectAttributes, you can pass almost any data to the redirect URL:

@RequestMapping(value="/someURL", method=GET)
public String yourMethod(RedirectAttributes redirectAttributes)
{
   ...
   redirectAttributes.addAttribute("rd", "rdValue");
   redirectAttributes.addFlashAttribute("fa", faValue);
   return "redirect:/someOtherURL";
}

When you use addAttribute to add attributes, this will end up in the target redirect URL. These attributes are used to construct the request parameters and the client (browser) will send a new request to the redirect URL with these parameters. With this, you are limited to use String or primitives as your redirect attributes.

And when you use addFlashAttribute, these attributes are saved temporarily before the redirect (typically in the session) and are available to the request after the redirect and removed immediately. The advantage of using flashAttributes is that, you can add any object as a flash attribute (as it is stored in session).