I need to pass the value of userName from Spring controller to JSP page

Question

@RequestMapping(value = "/submitlogin", method = RequestMethod.POST)
public String checkLoginDetails(@ModelAttribute("login") LoginBean loginBean, BindingResult result) {

    if (service.validate(loginBean)) {
        //model.addAttribute("userName", " " + loginBean.getUserName());
        return "success";
    }

    return "invalid";
}

But I'm not allowed to add other parameters to the function.I need to pass userName to the "success.jsp" using Spring. I'm new to spring,plz help me with this.

Answer 1

You are missing a final Model model in your method signature. Therefore your signature should look like following:

public String checkLoginDetails(final Model model, @ModelAttribute("login") LoginBean loginBean, BindingResult result) 

Then you can use the Model parameter to add further attributes. For example:

model.addAttribute(ModelAttributeConstants.SUCCESSFUL, false);

or

model.addAttribute("successful", false);

Or to use your case

model.addAttribute("userName", " " + loginBean.getUserName());

I prefer the way using constants as I can use them in every place without thinking about the correct spelling. For sure you have to define you own constants class and names:)