spring - 如何在 Spring MVC simpleformcontroller 上添加错误？

Question

我的 Spring MVC 2.5 应用程序遇到这个问题，我不知道该怎么办。

这是我的代码:

public class AddStationController extends SimpleFormController {
 private SimpleStationManager stationManager;

 protected ModelAndView onSubmit(HttpServletRequest request,
   HttpServletResponse response, Object command, BindException errors)
   throws Exception {
  StationDetails detail = (StationDetails) command;
  //add to DB
  int return = stationManager.addStation(detail);

  //return value: 1 = successful, 
  //    if not = unsuccessful

  if(return != 1){
   //how can I add error so that when I display my formview ,
   //I could notify the user that saving to the db is not successful?
   showform();
  }
  return new ModelAndView("redirect:" + getSuccessView());
 }
}

如何在再次显示表单 View 时添加一些消息，以便告诉用户添加电台未成功？

如何在我的 jsp 中处理它？<​​/p>

Answer 1

我起初以为您可能想使用验证器，但我认为您可以执行以下操作:

public class AddStationController extends SimpleFormController {
 private SimpleStationManager stationManager;

 protected ModelAndView onSubmit(HttpServletRequest request,
   HttpServletResponse response, Object command, BindException errors)
   throws Exception {
  StationDetails detail = (StationDetails) command;
  //add to DB
  int return = stationManager.addStation(detail);

  //return value: 1 = successful, 
  //    if not = unsuccessful

  if(return != 1){
   //Account for failure in adding station
   errors.reject("exception.station.submitFailure", "Adding the station was not successful");
   showform(request, response, errors);
  }
  return new ModelAndView("redirect:" + getSuccessView());
 }
}

然后在您的 JSP 中您可以执行以下操作:

<form:errors path="*">

然后您绑定(bind)的任何错误都会显示在那里。