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)。
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：）
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, "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;
}
}
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><!--看见网上很多例子都在这里加上下面两行，但经过测试，没有这两行也完全没影响。（看了下，发现这里的配置只在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>
页面代码：
<%@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>
使用类库是jsf1.2版本的。
效果图如下：
注 ：该例子中关于自定义errorSummary和errorDetail的功能没有实现。
