org.springframework.validation.BeanPropertyBindingResult - 没有错误答案

【问题标题】：org.springframework.validation.BeanPropertyBindingResult - No errororg.springframework.validation.BeanPropertyBindingResult - 没有错误
【发布时间】：2019-03-18 12:16:56
【问题描述】：

在 Spring MVC 应用程序中，表单数据验证未正确进行，并且 org.springframework.validation.BeanPropertyBindingResult 未报告任何错误。

@RequestMapping(value="downloadfile", method=RequestMethod.POST)
    public String submitForm(@ModelAttribute("downloadMVbinder") 
                             @Valid DownloadFileVO downloadFileVO,
                             BindingResult bindingResult,
                             Model model) {
        System.out.println("Binding result object value ==> " + bindingResult.toString());

        ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
        Validator validator = factory.getValidator();
        Set<ConstraintViolation<DownloadFileVO>> constraintViolations = validator.validate(downloadFileVO);
        System.out.println("Constrain Violation object value ==>" + constraintViolations.toString());

        System.out.println("Model object value ==> " + model.toString());
        System.out.println("Model object value ==> " + downloadFileVO.toString());

        if (bindingResult.hasErrors()){
            return "DownloadfilePage";
        }

调试输出是

Binding result object value ==> org.springframework.validation.BeanPropertyBindingResult: 0 errors
Constrain Violation object value ==>[ConstraintViolationImpl{interpolatedMessage='length should be between 5 and 8 characters', propertyPath=password, rootBeanClass=class com.user1.test.model.DownloadFileVO, messageTemplate='length should be between 5 and 8 characters'}, ConstraintViolationImpl{interpolatedMessage='file length cannot be greater than 44 bytes length', propertyPath=fileName, rootBeanClass=class com.user1.test.model.DownloadFileVO, messageTemplate='file length cannot be greater than 44 bytes length'}, ConstraintViolationImpl{interpolatedMessage='length should be between 5 and 8 characters', propertyPath=userName, rootBeanClass=class com.user1.test.model.DownloadFileVO, messageTemplate='length should be between 5 and 8 characters'}]
Model object value ==> {downloadMVbinder=DownloadFormVO [ipAddres=NONEuserName=password=fileName=windowsPath=], org.springframework.validation.BindingResult.downloadMVbinder=org.springframework.validation.BeanPropertyBindingResult: 0 errors}
Model object value ==> DownloadFormVO [ipAddres=NONEuserName=password=fileName=windowsPath=]

我在查看0 errors 后更新了方法参数。 bindingResult 中仍然没有出现错误。我还使用捕获约束冲突的 javax.validation.ConstraintViolation 验证了模型对象。

您能否帮助解决为什么 bindingResult 对象中没有显示错误。

谢谢！

【问题讨论】：

标签： spring-mvc

【解决方案1】：

我使用 SpringValidatorAdapter 来公开 JSR 303 Validator。答案基于use of bindingresult 和convert JSR-303 validation errors to bindingresult 的帖子

@RequestMapping(value="downloadfile", method=RequestMethod.POST)

        public String submitForm(@ModelAttribute("downloadMVbinder") 
                             @Valid DownloadFileVO downloadFileVO,
                             BindingResult bindingResult,
                             Model model) {
        ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
        Validator validator = factory.getValidator();
        Set<ConstraintViolation<DownloadFileVO>> constraintViolations = validator.validate(downloadFileVO);
        SpringValidatorAdapter springValidator = new SpringValidatorAdapter(validator);
        springValidator.validate(downloadFileVO, bindingResult);

        if (bindingResult.hasErrors()){
            return "DownloadfilePage"; 
        }

【讨论】：