弹簧错误中Validator的目标无效?

问题描述

大家好，每当我尝试在春天调用验证器时，都会收到以下错误消息

Hi all I am getting the following error whenever I am trying to invoke validator in my spring

Servlet.service() for servlet spring threw exception: java.lang.IllegalStateException: Invalid target for Validator

请查看一下并帮助我解决此错误，以前我使用登录页面的验证，它可以正常工作，但现在不起作用.

Please have a look and help me out in this error, previously I user the validation for login page and it is working fine but now its not working.

这是我的代码段.

控制器

@Controller
public class NewUserRegistration
{
    @Autowired
    private UserService userService;

    @Autowired
    private NewUserValidator newUserValidator;

    @InitBinder
    public void initBinder(WebDataBinder binder)
    {
       binder.setValidator(newUserValidator);
    }

    @RequestMapping(value="/newUserAdd", method=RequestMethod.POST)
    public String addUser(@ModelAttribute("user")@Valid User user,BindingResult result, Model model)
    {
          return "NewUser";
    }

}

验证者

@Component
public class NewUserValidator  implements Validator
{
    @Override
    public boolean supports(Class<?> classz)
    {
        return NewUserRegistration.class.equals(classz);
    }

    @Override
    public void validate(Object obj, Errors error)
    {
    //Validation login for fields
    }
}

JSP页面

<form:form action="newUserAdd" method="POST" modelAttribute="user">
        <center>
        <table>
            <tr><td>User Id:</td><td><input name="userId" type="text" /></td><td><font color="red"><c:out value="${userIdError}" /></font> </td></tr>
            <tr><td>Password:</td><td><input name="userPassword" type="password"/></td><td><font color="red"><c:out value="${userPasswordError}" /></font></td></tr>
            <tr><td>Confirm Password:</td><td><input name="userConfirmPassword" type="password"/></td><td><font color="red"><c:out value="${userPasswordError}" /></font></td></tr>
            <tr><td>Name:</td><td><input name="userName" type="text"/></td><td><font color="red"><c:out value="${userPasswordError}" /></font></td></tr>
            <tr><td></td><td><input type="submit" value="Create"/></td></tr>

        </table>
        </center>
    </form:form>

推荐答案

问题实际上出在Validator类中，您正在使用NewUserRegistration的对象，这是错误的，因为您要验证User的对象而不是NewUserRegistration的对象.

The problem is actually in Validator class you are using NewUserRegistration's object which is wrong because you want to validate your User's object not your NewUserRegistration's object.

@Override
    public boolean supports(Class<?> classz)
    {
        return NewUserRegistration.class.equals(classz);
    }

应该是

@Override
    public boolean supports(Class<?> classz)
    {
        return User.class.equals(classz);
    }

这篇关于弹簧错误中Validator的目标无效?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！