Spring MVC incoming parameters @RequestParam String requestedURL

Question

I have two Spring MVC actions that in this example takes one parameter from a form when submitted:

public ModelAndView login(HttpServletResponse response, HttpServletRequest request,  
@RequestParam String requestedURL ) 

I would like to know if the attribute requestedURL can refer to a declared variable that actually hold the name of the incoming attribute input name="requestURL" ...

class Core {
     static String requestedURL = "requestedURL"; 
}

pseudo code:

public ModelAndView login(..., @RequestParam String @ReadFrom(Core.RequestedURL) ) 

Notice the @ReadFrom

This is to avoid redundancy. Right now it is called requestedURL but in the future someone might want to change the input parameter name, this shouldn't be a hardcoded string in the applicaton in my opinion.

and

<input name="<%= Core.requestedURL %>" value="<%= requestedURL %>" />

and is read in the method when submitted. But does the attribute name have to be hardcoded in the incoming parameter of the action method?

Thanks!

Answer 1

Yes, it has to be hardcoded as part of the @RequestParam annotation - either hardcoded or refer to a static final variable.

The alternative is to take in a Model/Map as an additional parameter in the method and getting the attribute from that:

public ModelAndView login(HttpServletResponse response, HttpServletRequest request,  
Model model ){
    String requestedURL = model.asMap().get(Core.requestedURL);
} 

Update You can refer to a static final variable this way: assuming:

public abstract class Core {
     public static final String requestedURL = "requestedURL"; 
}

public ModelAndView login(..., @RequestParam(Core.requestedURL) String requestedURL)