java - 如何在 jsf 中使用接缝 validator ？

Question

我做了一个新的 Seam validator :

    package validators;

import java.io.Serializable;

import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.component.UIInput;
import javax.faces.context.FacesContext;
import javax.faces.validator.ValidatorException;

import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.faces.Validator;
import org.jboss.seam.annotations.intercept.BypassInterceptors;
import org.jboss.seam.log.Log;
import org.jboss.seam.log.Logging;

@Name("roCountyValidator")
@Validator
@BypassInterceptors
public class RoCountyValidator implements javax.faces.validator.Validator,
        Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = -3876319398131645955L;
    Log log = Logging.getLog(RoCountyValidator.class);

    public void validate(FacesContext context, UIComponent component,
            Object value) throws ValidatorException {
        log.info("validating....!");
        if (String.valueOf(value).equals("Arad"))
            ((UIInput) component).setValid(true);
        else {
            ((UIInput) component).setValid(false);
            FacesMessage message = new FacesMessage();
            message.setDetail("Invalid county");
            message.setSeverity(FacesMessage.SEVERITY_ERROR);
            throw new ValidatorException(message);
        }
    }
}

问题是我不知道如何直接从jsf中使用它...

以下不起作用....

我已经在一个特殊的 taglib 文件中声明了它:myvalidators.taglib.xml

<facelet-taglib>
<namespace>http://example.com/jsf/my/validators</namespace>
<tag>
    <tag-name>roCountyValidator</tag-name>
    <validator>
        <validator-id>roCountyValidator</validator-id>
    </validator>
</tag>

并尝试像这样使用它:

<h:inputText id="someField" value="#{booking.creditCardName}" 
                               required="true" label="County">
                <my:roCountyValidator/>
                <h:message for="someField"/>
            </h:inputText>

你能告诉我哪里错了吗？

谢谢。

Answer 1

解决这个问题的两种方法。

一是按照@BalusC 所写的那样使用。您不需要在 faces-config.xml 中定义任何内容

<h:inputText id="cc" required="true" value="#{booking.creditCardName}">
                <f:validator validatorId="roCountyValidator"/>
                <f:attribute name="oldCreditCardNumber" value="#{booking.creditCardName}" />
                <s:validate />
</h:inputText>

在这里你甚至可以绑定(bind)旧的信用卡号，如果你也想查看的话。

然后在你的验证方法中:

public void validate(FacesContext context, UIComponent component,
        Object value) throws ValidatorException {
    log.info("validating....!");

    String oldCreditcard = String.valueOf(component.getAttributes().get("oldCreditCardNumber"));
    String newCreditCard = (String) value;
    if(SomeClass.isCorrectCreditcard(newCreditCard)) {
        //You don't need to setValid(false), this is done automatically
        Map<String, String> messages = Messages.instance();
            throw new ValidatorException(new FacesMessage(FacesMessage.SEVERITY_ERROR, messages.get("wrongCreditCardNumber"), messages
                    .get("wrongCreditCardNumber")));

    }
}

---

另一种方法是使用 validator在 <h:inputText> 中标记

您甚至不需要创建 @Validator类，只要它是接缝组件并且使用相同的方法签名即可。

我为所有通用 validator 使用 validator 组件

@Name("validator")
@Scope(ScopeType.EVENT)
@BypassInterceptors
public class Validator {

public void positiveInteger(FacesContext context, UIComponent toValidate, Object value) {
        String val = (String) value;

        try {
            int v = Integer.parseInt(val);
            if (v < 0)
                throw new NumberFormatException();
        } catch (NumberFormatException e) {
            ((UIInput) toValidate).setValid(false);
            FacesMessages.instance().addToControlFromResourceBundle(toValidate.getId(), "invalid.integer");
        }
    }
}

现在你可以添加 validator 了:

<h:inputText value="#{foo.bar}" required="true" validator="#{validator.positiveInteger}">
  <s:validate/>
<h:inputText>