validation - JSF Validator 与字符串的平等比较

Question

如何在 JSF 验证器中比较两个字符串是否相等？

if (!settingsBean.getNewPassword().equals(settingsBean.getConfirmPassword())) {
    save = false;
    FacesUtils.addErrorMessage(null, "Password and Confirm Password are not same", null);
}

Answer 1

使用正常的Validator在第二个组件上并将第一个组件的值作为第二个组件的属性传递。

所以，所以

<h:inputSecret id="password" binding="#{passwordComponent}"
    value="#{bean.password}"
    required="true"
    requiredMessage="Please enter password" 
    validatorMessage="Please enter at least 8 characters">
    <f:validateLength minimum="8" />
</h:inputSecret>
<h:message for="password" />

<h:inputSecret id="confirmPassword" 
    required="#{not empty passwordComponent.value}"
    requiredMessage="Please confirm password"
    validatorMessage="Passwords are not equal">
    <f:validator validatorId="validateEqual" />
    <f:attribute name="otherValue" value="#{passwordComponent.value}" />
</h:inputSecret>
<h:message for="confirmPassword" />

( note that binding on first component is exactly as-is; you shouldn't bind it to a bean property! )

与

@FacesValidator(value="validateEqual")
public class ValidateEqual implements Validator<Object> {

    @Override
    public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
        Object otherValue = component.getAttributes().get("otherValue");

        if (value == null || otherValue == null) {
            return; // Let required="true" handle.
        }

        if (!value.equals(otherValue)) {
            throw new ValidatorException(new FacesMessage("Values are not equal."));
        }
    }

}

如果您碰巧使用 JSF 实用程序库 OmniFaces ，那么您可以使用 <o:validateEqual>为了这。 <o:validateEqual> showcase 演示了“确认密码”的具体情况。 .

另请参阅:

• JSF doesn't support cross-field validation, is there a workaround?