Question

我正在尝试验证包含电子邮件的Spring Bean，但是当请求Bean中的电子邮件为空字符串时，验证器和BindingResult都不会显示任何错误。请参阅以下代码：

豆：

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;
import org.springmodules.validation.bean.conf.loader.annotation.handler.Email;
import org.springmodules.validation.bean.conf.loader.annotation.handler.NotEmpty;

@Component("grouponRedemptionFormBean")
@Scope("prototype")
public class GrouponRedemptionBean {

@NotEmpty(message = "Please enter your email addresss.")
@Email(message = "Please correct your email.")
private String  email;
   …
}

控制器：

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.validation.Valid;

import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BeanPropertyBindingResult;
import org.springframework.validation.BindingResult;
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;


@Controller
public class GrouponVoucherRedemptionController {

@Autowired
@Qualifier("defaultBeanValidator")
private Validator validator;

@RequestMapping(value="/groupon-redemption.ep", method=RequestMethod.POST)
public String PostGrouponRedemption(@Valid @ModelAttribute GrouponRedemptionBean grouponRedemptionBean, BindingResult bindingResult,
HttpServletRequest request, HttpServletResponse response, Model model){

    Errors errors = new BeanPropertyBindingResult(grouponRedemptionBean, "grouponRedemptionFormBean");
    validator.validate(grouponRedemptionBean, errors);
    if(errors.hasErrors()) {
        bindingResult.addAllErrors(errors);
    }
    if (bindingResult.hasErrors()) {
        return GROUPON_REDEMPTION_VIEW;
    }    
...

XML配置：

<mvc:annotation-driven />

Answer 1

您的参数顺序错误 - BindingResult必须紧跟在模型对象之后（在您的情况下为GrouponRedemptionBean）。请参阅documentation：

Errors或BindingResult参数必须遵循立即绑定的模型对象，因为方法签名可能具有多个模型对象，而Spring将创建单独的BindingResult实例对于他们每个人，所以以下样本将无法工作：

BindingResult和@ModelAttribute的排序无效。
@RequestMapping(method = RequestMethod.POST)
public String processSubmit(@ModelAttribute("pet") Pet pet, Model model, BindingResult result) { ... }
请注意，Model和Pet之间存在BindingResult参数。要使其正常工作，您必须按如下方式重新排序参数：
@RequestMapping(method = RequestMethod.POST)
public String processSubmit(@ModelAttribute("pet") Pet pet, BindingResult result, Model model) { ... }

Answer 2

您可以使用

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-validation</artifactId>
</dependency>

或者这个

<bean id="validator"
  class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"/>

为什么Spring BindingResult或验证器不显示任何错误？

2 个答案: