Spring MVC和JSR 303

Question

我正在使用Spring 3和JSR 303.我有一个表单支持对象,其嵌套对象需要进行验证.在下面的示例中,如何验证formObject.getFoo().getBean()？当我运行下面的代码时,结果参数始终为空,即使HTML页面没有提交任何内容,验证失败时也是如此.请注意,当我通过调用手动验证它时,它可以工作(即验证失败)validate(formObject.getFoo().getBean(), Bean.class).

@Controller
public class FormController {
    @RequestMapping(method = RequestMethod.POST)
    public void process(HttpServletRequest request, @Valid FormObject formObject, BindingResult result) {
            ...
    }

    // This is the class that needs to be validated.
    public class Bean {
        @NotBlank
        private String name;
    }

    public class Foo {
        private Bean bean;
    }

    public class FormObject {
        private Foo foo;
    }
}

Answer 1

如果要将验证级联到子对象,则必须将@Valid注释放在父对象的字段中:

public class Bean {
    @NotBlank
    private String name;
}

public class Foo {
    @Valid
    private Bean bean;
}

public class FormObject {
    @Valid
    private Foo foo;
}