Question

道

@Repository
public interface LoginDao extends JpaRepository<Login, Integer> {
    Login findByLogin(String login);
}

验证

@Component
public class PasswordChangeValidator implements Validator {

private LoginDao loginDao;

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

@Override
public void validate(Object o, Errors errors) {

    PasswordChange passwordChange = (PasswordChange) o;

            **// There is a null pointer here because loginDao is null** 
    Login login = loginDao.findByLogin(passwordChange.getLoginKey());


}

public LoginDao getLoginDao() {
    return loginDao;
}

@Autowired
public void setLoginDao(LoginDao loginDao) {
    **// There is a debug point on the next line and it's hit on server startup and I can
    // see the parameter us non-null** 
    this.loginDao = loginDao;
}
}

控制器

@Controller
@RequestMapping("api")
public class PasswordController {

    @Autowired
    PasswordService passwordService;

    @InitBinder("passwordChange")
    public void initBinder(WebDataBinder webDataBinder, WebRequest webRequest) {
        webDataBinder.setValidator(new PasswordChangeValidator());
    }   

    @RequestMapping(value = "/passwordChange", method = RequestMethod.POST)
    public @ResponseBody PasswordInfo passwordInfo(@RequestBody @Valid PasswordChange passwordChange)
            throws PasswordChangeException {
        return passwordService.changePassword(passwordChange.getLoginKey(), passwordChange.getOldPassword(), passwordChange.getNewPassword());
    }


}

我有上面列出的Dao。这个相同的dao bean被注入一个@Service注释类，但不会注入@Component注释的Validator类。好吧，不完全是在服务器启动时我可以看到调用setter方法，但是当我尝试在方法中使用此变量时，变量显示为null。

有人看到我的配置有问题吗？请注意，loginDao bean被注入服务类，因此Context配置很好。

Answer 1

那就是你的问题

webDataBinder.setValidator(new PasswordChangeValidator());

Spring只能管理它创建的bean 。在这里，您正在创建实例。而是将您的bean注入@Controller并使用它。

@Inject
private PasswordChangeValidator passwordChangeValidator;
...
webDataBinder.setValidator(passwordChangeValidator);

Spring不会注入JPARepository bean

1 个答案: