java - 无法使用 Spring Boot 和 Thymeleaf 进行验证

Question

我有一个带有 1 个显示表单的 Controller 的 Spring Boot 应用程序(使用版本 1.2.3)。这一切都很好，但现在我想添加验证。我的 Controller 中有这个方法:

@RequestMapping(value = "/licensing", method = RequestMethod.POST)
public String doRegistration( @Valid CustomerLicenseRegistration customerLicenseRegistration, Model model, BindingResult bindingResult )
{
    if( bindingResult.hasErrors())
    {
        logger.debug( "There are errors! {}", bindingResult );
        return "customer/license-registration";
    }
    logger.debug( "customerLicenseRegistration: " + customerLicenseRegistration );
    CustomerLicense customerLicense = m_licenseService.createCustomerLicense( customerLicenseRegistration );
    model.addAttribute( "customerLicense", customerLicense );
    return "customer/license-registration-done";
}

如果我现在输入无效的内容，我会在提交后得到“Whitelabel 错误页面”，并且我的方法内的断点永远不会被命中(如果我删除 @Valid 注释，断点会被命中)。错误页面显示:

Whitelabel Error Page

This application has no explicit mapping for /error, so you are seeing this as a fallback.

Mon May 18 09:42:27 CEST 2015
There was an unexpected error (type=Bad Request, status=400).
Validation failed for object='customerLicenseRegistration'. Error count: 1

Spring 似乎注意到该对象无效，但它没有再次显示表单，因此用户可以修复他的错误。我做错了什么？

Answer 1

由于 the tutorial here 找到了答案.我必须更改我的方法签名:

public String doRegistration( @Valid CustomerLicenseRegistration customerLicenseRegistration, 
Model model, 
BindingResult bindingResult )

到:

public String doRegistration( @Valid CustomerLicenseRegistration customerLicenseRegistration, 
BindingResult bindingResult, 
Model model )

注意 BindingResult 必须在我使用 @Valid 注释的对象之后立即。