Java 无法使用 Spring Boot 和 Thymeleaf 进行验证
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Cannot get validation working with Spring Boot and Thymeleaf
提问by Wim Deblauwe
I have a Spring Boot application (using version 1.2.3) with 1 controller that shows a form. This all works fine, but now I want to add validation. I have this method in my controller:
我有一个带有 1 个显示表单的控制器的 Spring Boot 应用程序（使用版本 1.2.3）。这一切正常，但现在我想添加验证。我的控制器中有这个方法：
@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";
}
If I now type something invalid, I get the "Whitelabel error page" after submit and my breakpoint inside the method is never hit (If I remove the @Validannotation, the breakpoint does get hit). The error page shows:
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 seems to notice that the object is not valid, but it does not show the form again so the user can fix his mistake. What am I doing wrong?
Spring 似乎注意到该对象无效，但它不会再次显示该表单，因此用户可以修复他的错误。我究竟做错了什么？
采纳答案by Wim Deblauwe
Found the answer due to the tutorial here. I have to change my method signature from:
由于教程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 )
to:
到：
public String doRegistration( @Valid CustomerLicenseRegistration customerLicenseRegistration,
BindingResult bindingResult,
Model model )
Notice how the BindingResulthas to be immediatelyafter the object I have annotated with @Valid.
注意BindingResult必须在我用 注释的对象之后立即出现@Valid。
回答by Abhishek Singh
In my case it was wrong input to the input box. Actually i entered "-"special character in the input boxwhich throws same error -Validation failed for object='events'. Error count: 5. I resolved it by entering numerical/Stringvalues.
在我的情况下，输入框输入错误。实际上，我在输入框中输入了“-”特殊字符，这会引发相同的错误 - object='events' 验证失败。错误计数：5。我通过输入数字/字符串值来解决它。
