code: protected ModelListForm getModelListForm(ActionMapping actionMapping, ActionForm actionForm, HttpServletRequest request) throws Exception {
  		ModelListForm modelListForm = null;
  		if (actionForm == null) {
  			modelListForm = new ModelListForm();
  			FormBeanUtil.saveActionForm(modelListForm, actionMapping, request);
  		} else if (actionForm instanceof ModelListForm)
  			modelListForm = (ModelListForm) actionForm;
  
  		if (modelListForm == null)
  			throw new Exception("not found the bean of com.jdon.strutsutil.ModelListForm");
  		else
  			return modelListForm;
  
  	}
docs: 获得ModelListForm实例
  
  @param actionMapping
  @param actionForm
  @param request
  @return
  @throws java.lang.Exception