ModelAndView介绍

ModelAndView

案例见 public ModelAndView testModelAndView()

@RequestMapping(value="/testModelAndView",method=RequestMethod.GET)
 public ModelAndView testModelAndView()
 {
   ModelAndView mv = new ModelAndView();
   mv.addObject("myModelAndView",new java.text.SimpleDateFormat("yyyy-MM-dd 
HH:mm:ss").format(new Date()));
   mv.setViewName("ok");
   
   return mv;
 }

debug

结论

springmvc会将模型数据放进了request请求域里面,ModelAndView底层实际就是request.setAttribute(k,v)

protected void exposeModelAsRequestAttributes(Map<String, Object> model, HttpServletRequest 
request) throws Exception {
   for (Map.Entry<String, Object> entry : model.entrySet()) {
   String modelName = entry.getKey();
   Object modelValue = entry.getValue();
    if (modelValue != null) {
      request.setAttribute(modelName, modelValue);
      if (logger.isDebugEnabled()) {
       logger.debug("Added model object '" + modelName + "' of type [" + 
modelValue.getClass().getName() +
          "] to request in view with name '" + getBeanName() + "'");
     }
   }
    else {
     request.removeAttribute(modelName);
      if (logger.isDebugEnabled()) {
       logger.debug("Removed model object '" + modelName +
          "' from request in view with name '" + getBeanName() + "'");
     }
   }
  }
 }