在Spring中，如何指定BindingResult实现

Question

I would like to specify the implementing type of BindingResult within a controller. Is there a way to do that? At the moment, it appears that Spring must determine the implementing type itself (which happens to be a BeanPropertyBindingResult). I suspect there is either a configuration that I'm missing somewhere, or I just need to specify the actual type in the Controller's method signature.

Example:

/**
 * {@inheritDoc}
 */
@Override
public ModelAndView continue(@ModelAttribute("model") @Valid final T model, final BindingResult results) { ... }

Answer 1

You don't need a custom BindingResult for what you want to do. You need to implement a BindingErrorProcessor and use it in the WebDataBinder . It is responsible for adding the errors to the BindingResult and will allow you to use your custom Errors implementation. Here is how you would use it in your controller...

@Controller
public class MyFormController {
    ...

    @InitBinder
    public void initBinder(WebDataBinder binder) {
        binder.setBindingErrorProcessor(new MyCustomBindingErrorProcessor());
    }
}

Mixing binding and validation is bad practice, classes should have a single responsibility. You should not be doing validation in the BindingResult itself.

Answer 2

You have to add ModelAndView in front of @ModelAttribute like:

public ModelAndView continue(ModelAndView model, @ModelAttribute("model") ObjectType objectName){
}