这两天有个朋友在做jsf自定义验证器时遇到了一些问题，问了我。我整了好久也没能搞明白，后来发现可能是他实现自定义验证器时使用的类太老(项目用的是jsf1.2，自定义验证器时却用的jsf1.1的类-ValidatorTag，这个类在jsf1.2中已经被建议不使用，这位朋友在实现时用的tld标签也是2.0之上的，我也不确定问题是否出在这里)。

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下班后没事就在jsf1.2的库上，在参考网上一些资料的情况下，自己写了一个自定义验证器的demo。该例子用途是验证email格式。现贴出代码：）

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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;
    }
}

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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, "输入不能为空！", "您的输入为空，请输入！");
            //return;
        }else if (value.toString().length() > Integer.parseInt(getLength())) {
            message = new FacesMessage(FacesMessage.SEVERITY_ERROR, "输入长度超过" + getLength() + "位！", "输入长度超过" + getLength() + "位！请重新输入！");
            //return;
        }else if (regex != null && !regex.equals("")) {
            boolean b = Pattern.matches(regex, value.toString());
            if (!b) {
                message = new FacesMessage(FacesMessage.SEVERITY_ERROR, "输入的邮编格式错误！", "输入的邮编格式错误！请确认！");
                //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;
    }


}

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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