java - 在多个类的 spring MVC Controller 中应用自定义 validator

Question

我有一个使用自定义 validator 的注册页面

public class CustomValidator implements Validator {

    private Validator validator;

    public CustomValidator(Validator validator) {
        this.validator = validator;
    }

    @SuppressWarnings("rawtypes")
    public boolean supports(Class clazz) {
        return Registration.class.equals(clazz);
    }

    public void validate(Object target, Errors errors) {

        validator.validate(target, errors);



        Registration myModel1 = (Registration) target;
        if (! myModel1.getConfirm_password().equals(myModel1.getPassword())) {
            errors.rejectValue("confirm_password", "confirm_password.confirm");
        }

    }
}

问题是我想在两种形式上应用它，所以我很困惑如何用两个类编写这个函数。这个功能现在只有注册类。如果我也想要 Person 类呢

public boolean supports(Class clazz) {
        return Registration.class.equals(clazz);
    }

我可以在那个函数中写多个类吗

这是我的 Controller

@InitBinder
    public void initBinder(final WebDataBinder binder) {
        binder.registerCustomEditor(Date.class, null, new CustomDateEditor(new SimpleDateFormat("dd-MM-yyyy"), true));
        Validator validator = (Validator) binder.getValidator();
        binder.setValidator(new CustomValidator((org.springframework.validation.Validator) validator));
    }

Answer 1

你可以这样做

public boolean supports(Class clazz) {
    return Registration.class.equals(clazz) || Another.class.equals(clazz);
}

然后你的验证应该做这样的事情

    public void validate(Object target, Errors errors) {
    validator.validate(target, errors);

    String password = null;
    String confirm = null;
    if (target instanceof Registration) {
        Registration registration = (Registration) target;
        password = registration.getPassword();
        confirm = registration.getConfirm_password();
    } else if (target instanceof Another) {
        Another another = (Another) target;
        password = another.getPassword();
        confirm = another.getConfirm_password();
    }
    if (! confirm.equals(password())) {
        errors.rejectValue("confirm_password", "confirm_password.confirm");
    }

}

我认为您不应该使用它，可能最好使用它来分隔类以提高可读性并降低复杂性。在您的 validator 或模型对象(访客模式)中引入层次结构并不是最好的解决方案。