1.initModel
功能：
public void initModel(NativeWebRequest request, ModelAndViewContainer container, HandlerMethod handlerMethod)throws Exception {Map<String, ?> sessionAttributes = this.sessionAttributesHandler.retrieveAttributes(request);container.mergeAttributes(sessionAttributes);invokeModelAttributeMethods(request, container);for (String name : findSessionAttributeArguments(handlerMethod)) {if (!container.containsAttribute(name)) {Object value = this.sessionAttributesHandler.retrieveAttribute(request, name);if (value == null) {throw new HttpSessionRequiredException("Expected session attribute '" + name + "'", name);}container.addAttribute(name, value);}}}
2.updateModel
)
