如何在Spring MVC中将一个控制器调用到另一个控制器URL？

嗨，我是Spring MVC的新手，我想从一个控制器调用方法到另一个控制器，我该怎么做。请在下面检查我的代码

@Controller

    @RequestMapping(value="/getUser")
    @ResponseBody
    public User getUser()
    {
        User u = new User();
        //Here my dao method is activated and I wil get some userobject
       return u;
    }
   @Controller

    @RequestMapping(value="/updatePSWD")
    @ResponseBody
    public String updatePswd()
    {
        here I want to call above controller method and 
       I want to update that user password here.
       how can  I do that 
        return "";
    }

任何人都可以帮助我。