java 从视图中访问 Spring MVC BindingResult
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Access Spring MVC BindingResult from within a View
提问by perdian
I'm looking for a way to access a BindingResultfrom within the view (in my case a JSP page).
我正在寻找一种BindingResult从视图中访问 a 的方法（在我的例子中是一个 JSP 页面）。
I have the following controller method:
我有以下控制器方法：
@RequestMapping(value="/register/accept.html",method=RequestMethod.POST)
public ModelAndView doRegisterAccept(
@Valid @ModelAttribute("registrationData") RegistrationData registrationData,
BindingResult bindingResult
) {
ModelAndView modelAndView = new ModelAndView();
modelAndView.addObject("bindingResultXXX", bindingResult);
modelAndView.setViewName("users/registration/register");
return modelAndView;
}
When executing this, the RegistrationDataget's populated and the errors are stored in the BindingResult. So far, so good. However, I do have to add the BindingResultmanually into the ModelAndViewfor it to become visible within the View.
执行此操作时，将RegistrationData填充 get 并将错误存储在BindingResult. 到现在为止还挺好。但是，我必须BindingResult手动将其添加到ModelAndView其中才能在视图中可见。
Is there a way to automaticallyadd the BindingResultinto the model? I already tried adjusting the method signature to
有没有办法自动添加BindingResult到模型中？我已经尝试将方法签名调整为
public ModelAndView doRegisterAccept(
@Valid @ModelAttribute("registrationData") RegistrationData registrationData,
@ModelAttribute("bindingResult") BindingResult bindingResult
) {
where I was hoping - as any other parameter - the BindingResultwould get added into the model under the key bindingResultbut unfortunately that's not working.
我希望 - 作为任何其他参数 -BindingResult将被添加到密钥下的模型中，bindingResult但不幸的是这不起作用。
So, any ideas?
那么，有什么想法吗？
Addition
添加
I just found that the results indeed get published using the key
我刚刚发现结果确实使用密钥发布
org.springframework.validation.BindingResult.<NAME_OF_MODEL_ATTRIBUTE>
so I suppose just adding it under the plain name is not encouraged by the Spring guys?!
所以我想只是在普通名称下添加它不会受到 Spring 家伙的鼓励吗？！
回答by Mathieu L
You have to add "errors" tag in your form view, as described here : http://static.springsource.org/spring/docs/3.0.5.RELEASE/reference/view.html#view-jsp-formtaglib-errorstag. Then in your Controller, you just put a test :
您必须在表单视图中添加“错误”标签，如下所述：http: //static.springsource.org/spring/docs/3.0.5.RELEASE/reference/view.html#view-jsp-formtaglib-errorstag. 然后在您的控制器中，您只需进行测试：
if(bindingResult.hasErrors()) {
... display your form page again
(and "errors" tags will be populated by validation messages corresponding to each field) ...
}
else {
... here, you know that your RegistrationData is valid so you can treat it (save it I guess) ...
}
