Spring MVC Easy way to pass @RequestParam annotated arguments to model

Question

I would like to pass many @RequestParam annotated parameters to a Model object in an easy fashion.

Currently, I see two alternatives:

1. You can do it by hand (not so easy, example below)
2. You can create command objects for related parameters, and pass the object to your model.

I'm looking for a third way, which will do this for me automatically.

@RequestMapping
public void handle(@RequestParam String p1, @RequestParam String p2,
       @RequestParam String p3, @RequestParam String p4, Model model) {
     model.addAttribute("p1",p1);
     model.addAttribute("p2",p2);
     model.addAttribute("p3",p3);
     model.addAttribute("p4",p4);
}

The main reason I need this is to pass the parameters in a POST handler to flash attributes easily in case of an error.

Update: @ModelAttribute method (or specifying a bean without it, I think they're basically the same when you don't give @ModelAttribute a value) is actually the the second method I mentioned in the question. I'm looking for a way other than those I mentioned.

Answer 1

I prefer to use

@RequestMapping
public void handle(BeanDTO p1, Model model ){
    model.addAttribute("Bean",p1);
} 

It takes all the parameters that match with the property beans and place them

classs BeanDTO {    
    private String p1;
    private String p2;
    private String p3;
} 

Sorry withouth @RequestBody

Check this. Spring MVC bean mapping to HTTP GET request parameters similar to @BeanParam

Answer 2

I would do this way. Where as P is a java bean with the request parameters

@RequestMapping
    public ModelAndView handle(@ModelAttribute("p") P p) 
    {
      if (validationerror){
          return new ModelAndView("index","p",p);
      }
      return new ModelAndView("success");
    }