使用Spring表单验证错误

时间:2012-08-04 00:39:32

标签: java spring validation jsp controller

我正在尝试使用sf:form来持久化实体。

这是jsp:

<sf:form method="POST" action="${pageContext.request.contextPath}/addStudent" modelAttribute="student">
<fieldset>
<table>
<tr>
    <th><sf:label path="nb">Number:</sf:label></th>
    <td><sf:input type="text" path="nb"/><br/>
    <sf:errors path="nb"></sf:errors>
</tr>
......
</table>  
</fieldset>

实体中的属性是这样的:

@NotNull(message="not null")
@Size(min=5, max=10, message="length min 5")
@Column(name="NB", unique=true)
private String nb;

控制器:

@RequestMapping(value="/addStudent", method=RequestMethod.POST)
public ModelAndView addStudent(HttpServletRequest request, @ModelAttribute("student") @Valid Student student, BindingResult bR){

    ModelAndView mav = new ModelAndView("students");
    if(bR.hasErrors()){
        return mav;
    }
    studentService.saveStudent(student);
    return mav;
}

好吧,当我将nb字段留空或者条目变短时,我得到验证错误。我的问题是jsp中没有显示错误,但抛出异常:

List of constraint violations:[
ConstraintViolationImpl{interpolatedMessage='length min 5', propertyPath=nb, rootBeanClass=class i.have.serious.problem.Student, messageTemplate='length min 5'}  
javax.validation.ConstraintViolationException: Validation failed for classes [i.have.serious.problem.Student] during persist time for groups [javax.validation.groups.Default, ]

也许我想念一些东西......我感谢任何提示或帮助,thx

----------------------------- 已解决 ------- ----------------------------

2 个答案:

答案 0 :(得分:1)

确实......我错过了一些东西 - &gt;如果类路径中存在JSR-303提供程序,则支持使用@Valid验证@Controller输入。

xmlns:mvc="http://www.springframework.org/schema/mvc"
http://www.springframework.org/schema/mvc 
http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd">

<mvc:annotation-driven />

现在工作正常:) .. thx for careing tho!

答案 1 :(得分:0)

您正在方法中创建一个新的ModelAndView,这可能无法将bindingResult带回视图。

您可以将ModelAndView作为附加参数,看看是否有效:

@RequestMapping(value="/addStudent", method=RequestMethod.POST)
public ModelAndView neuStudent(HttpServletRequest request, @ModelAttribute("student") @Valid Student student, BindingResult bR, ModelAndView mav){

    mav.setViewName("students");
    if(bR.hasErrors()){
        return mav;
    }
    studentService.saveStudent(student);
    return mav;
}