Spring MVC ViewResolver技术

    protected void render(ModelAndView mv, HttpServletRequest request, HttpServletResponse response) throws Exception {  
            // Determine locale for request and apply it to the response.  
            Locale locale = this.localeResolver.resolveLocale(request);  
            response.setLocale(locale);  
      
            View view;  
            if (mv.isReference()) {  
                // We need to resolve the view name.  
                view = resolveViewName(mv.getViewName(), mv.getModelInternal(), locale, request);  
                if (view == null) {  
                    throw new ServletException(  
                            "Could not resolve view with name ‘" + mv.getViewName() + "‘ in servlet with name ‘" +  
                                    getServletName() + "‘");  
                }  
            }  
            else {  
                // No need to lookup: the ModelAndView object contains the actual View object.  
                view = mv.getView();  
                if (view == null) {  
                    throw new ServletException("ModelAndView [" + mv + "] neither contains a view name nor a " +  
                            "View object in servlet with name ‘" + getServletName() + "‘");  
                }  
            }  
      
            // Delegate to the View object for rendering.  
            if (logger.isDebugEnabled()) {  
                logger.debug("Rendering view [" + view + "] in DispatcherServlet with name ‘" + getServletName() + "‘");  
            }  
            view.render(mv.getModelInternal(), request, response);  
        }  

    protected View resolveViewName(String viewName, Map<String, Object> model, Locale locale,  
            HttpServletRequest request) throws Exception {  
      
        for (ViewResolver viewResolver : this.viewResolvers) {  
            View view = viewResolver.resolveViewName(viewName, locale);  
            if (view != null) {  
                return view;  
            }  
        }  
        return null;  
    }