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這兩天有個朋友在做jsf自定義驗證器時遇到了一些問題，問了我。我整了好久也沒能搞明白，后來發現可能是他實現自定義驗證器時使用的類太老(項目用的是jsf1.2，自定義驗證器時卻用的jsf1.1的類-ValidatorTag，這個類在jsf1.2中已經被建議不使用，這位朋友在實現時用的tld標簽也是2.0之上的，我也不確定問題是否出在這里)。

下班后沒事就在jsf1.2的庫上，在參考網上一些資料的情況下，自己寫了一個自定義驗證器的demo。該例子用途是驗證email格式。現貼出代碼：）

package test.managebean下的class：

    package test.managebean;

/**
 *
 * @author SailingLee
 */
public class TestManageBean {

    private String postCode;

   
   
    public void doSomeThing(){
        System.out.println("============doSomeThing============");
    }

    /**
     * @return the postCode
     */
    public String getPostCode() {
        return postCode;
    }

    /**
     * @param postCode the postCode to set
     */
    public void setPostCode(String postCode) {
        this.postCode = postCode;
    }
}

package test.validator下的class：

    package test.validator;

import java.io.Serializable;
//import java.text.MessageFormat;
import java.util.regex.Pattern;
//import java.util.Locale;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.validator.Validator;
import javax.faces.validator.ValidatorException;
import javax.faces.application.FacesMessage;

/**
 *
 * @author SailingLee
 */
public class CustomValidator implements Validator, Serializable {

    private String length;
    private String regex;
    private String errorSummary;
    private String errorDetail;

    public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
        FacesMessage message = null;
        if (value == null || value.toString().trim().length() == 0) {
            message = new FacesMessage(FacesMessage.SEVERITY_ERROR, "輸入不能為空！", "您的輸入為空，請輸入！");
            //return;
        }else if (value.toString().length() > Integer.parseInt(getLength())) {
            message = new FacesMessage(FacesMessage.SEVERITY_ERROR, "輸入長度超過" + getLength() + "位！", "輸入長度超過" + getLength() + "位！請重新輸入！");
            //return;
        }else if (regex != null && !regex.equals("")) {
            boolean b = Pattern.matches(regex, value.toString());
            if (!b) {
                message = new FacesMessage(FacesMessage.SEVERITY_ERROR, "輸入的郵編格式錯誤！", "輸入的郵編格式錯誤！請確認！");
                //return;
            }
        }
        throw new ValidatorException(message);

    }



    /**
     * @return the errorSummary
     */
    public String getErrorSummary() {
        return errorSummary;
    }

    /**
     * @param errorSummary the errorSummary to set
     */
    public void setErrorSummary(String errorSummary) {
        this.errorSummary = errorSummary;
    }

    /**
     * @return the errorDetail
     */
    public String getErrorDetail() {
        return errorDetail;
    }

    /**
     * @param errorDetail the errorDetail to set
     */
    public void setErrorDetail(String errorDetail) {
        this.errorDetail = errorDetail;
    }

    /**
     * @return the regex
     */
    public String getRegex() {
        return regex;
    }

    /**
     * @param regex the regex to set
     */
    public void setRegex(String regex) {
        this.regex = regex;
    }

    /**
     * @return the length
     */
    public String getLength() {
        return length;
    }

    /**
     * @param length the length to set
     */
    public void setLength(String length) {
        this.length = length;
    }


}

package test.tag下的class：

    package test.tag;

import test.validator.CustomValidator;
import javax.faces.validator.Validator;
import javax.faces.webapp.ValidatorELTag;
import javax.faces.context.FacesContext;
import javax.servlet.jsp.JspException;
import javax.el.ValueExpression;
import javax.el.ELContext;

/**
 *
 * @author SailingLee
 */
public class CustomValidatorTag extends ValidatorELTag {

    private ValueExpression length;
    private ValueExpression regex;
    private ValueExpression errorSummary;
    private ValueExpression errorDetail;

    @Override
    protected Validator createValidator() throws JspException {
        
        CustomValidator validator = new CustomValidator();
        ELContext elContext = FacesContext.getCurrentInstance().getELContext();
        validator.setLength((String) length.getValue(elContext));
        validator.setRegex((String) regex.getValue(elContext));
        if (errorSummary != null)
            validator.setErrorSummary((String) errorSummary.getValue (elContext));
        if (errorDetail != null)
            validator.setErrorDetail((String) errorDetail.getValue (elContext));
        return validator;
    }

    /**
     * @param length the length to set
     */
    public void setLength(ValueExpression length) {
        this.length = length;
    }

    /**
     * @param regex the regex to set
     */
    public void setRegex(ValueExpression regex) {
        this.regex = regex;
    }

    /**
     * @param errorSummary the errorSummary to set
     */
    public void setErrorSummary(ValueExpression errorSummary) {
        this.errorSummary = errorSummary;
    }

    /**
     * @param errorDetail the errorDetail to set
     */
    public void setErrorDetail(ValueExpression errorDetail) {
        this.errorDetail = errorDetail;
    }

    public void release() {
        length = null;
        regex = null;
        errorSummary = null;
        errorDetail = null;
    }
}

    <?xml version='1.0' encoding='UTF-8'?>

<!-- =========== FULL CONFIGURATION FILE ================================== -->

<faces-config version="1.2" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd">

<managed-bean>
    <managed-bean-name>testManageBean</managed-bean-name>
    <managed-bean-class>test.managebean.TestManageBean</managed-bean-class>
    <managed-bean-scope>request</managed-bean-scope>
</managed-bean>

<validator><!--看見網上很多例子都在這里加上下面兩行，但經過測試，沒有這兩行也完全沒影響。（看了下，發現這里的配置只在jsf1.1中需要） -->
    <validator-id>test.validator.CustomValidator</validator-id>
    <validator-class>test.validator.CustomValidator</validator-class>
</validator>
</faces-config>

    <?xml version="1.0" encoding="UTF-8"?>
<taglib version="2.0" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-jsptaglibrary_2_0.xsd">
    <tlib-version>1.0</tlib-version>
    <short-name>customvalidator</short-name>
    <uri>/WEB-INF/CustomValidator</uri>
    <tag>
        <name>email</name>
        <tag-class>test.tag.CustomValidatorTag</tag-class>
        <body-content>empty</body-content>
        <attribute>
            <name>length</name>
            <required>true</required>
            <deferred-value>
                <type>java.lang.String</type>
            </deferred-value>
        </attribute>
        <attribute>
            <name>regex</name>
            <required>true</required>
            <deferred-value>
                <type>java.lang.String</type>
            </deferred-value>
        </attribute>
        <attribute>
            <name>errorSummary</name>
            <deferred-value>
                <type>java.lang.String</type>
            </deferred-value>
        </attribute>
        <attribute>
            <name>errorDetail</name>
            <deferred-value>
                <type>java.lang.String</type>
            </deferred-value>
        </attribute>
    </tag>
</taglib>

        <jsp-config>
        <taglib>
            <taglib-uri>http://email.com</taglib-uri>
            <taglib-location>/WEB-INF/CustomValidator.tld</taglib-location>
        </taglib>
    </jsp-config>

頁面代碼：

    <%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>

<%@taglib prefix="f" uri="http://java.sun.com/jsf/core"%>
<%@taglib prefix="h" uri="http://java.sun.com/jsf/html"%>
<%@taglib prefix="custom" uri="http://email.com"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">

    <html>
        <head>
            <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
            <title>Custom Validate Email</title>
        </head>
        <body>
            
            <f:view>
                <h:form id="myform">
                    Email:<h:inputText id="postCode" value="#{testManageBean.postCode}">
                        <custom:email length="10" regex="[a-z]*@[a-z]*.[a-z]*"/>
                    </h:inputText>
                    <h:commandButton action="#{testManageBean.doSomeThing}" value="validate email"/>
                </h:form>
                <h:messages/>
            </f:view>
        </body>
    </html>

使用類庫是jsf1.2版本的。

效果圖如下：

自定義Email格式驗證器

注：該例子中關于自定義errorSummary和errorDetail的功能沒有實現。

JSF1.2自定義驗證器的實現

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