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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>实现 javax.faces.validator.Validator 接口 </b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 5 页（共9 页）</nobr></font></td>
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<font size="2" face="Verdana, Arial, Helvetica">
<p>在这个示例应用程序中，我们需要验证订阅者提供的电子邮件地址。下面是我们的电子邮件地址验证器类： </p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
/*
 * $Id: EmailAddressValidator.java,v 1.2 2003/06/20 16:48:49 jack Exp $
 * 
 */
package net.jackwind.jsf;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.faces.FactoryFinder;
import javax.faces.application.Application;
import javax.faces.application.ApplicationFactory;
import javax.faces.application.Message;
import javax.faces.component.UIComponent;
import javax.faces.component.UIOutput;
import javax.faces.context.FacesContext;
import javax.faces.context.MessageResources;
import javax.faces.validator.Validator;

/**
 * @author 	JACK	(Jun 16, 2003)
 * @class 	EmailValidator
 */
public class EmailAddressValidator implements Validator {

	/**
	 * The message identifier of the Message to be created if
	 * the validation fails.  
	 */
	public static final String EMAIL_ADDRESS_INVALID =
		"net.jackwind.jsf.EMAIL_ADDRESS_INVALID";

	// Email address pattern. Used by regex.
	public static String PATTERN_EMAIL =
  "[a-zA-Z0-9][\\w\\.\\-]*@[a-zA-Z0-9][\\w\\.\\-]*\\.[a-zA-Z][a-zA-Z\\.]*";
	private Pattern pattern = Pattern.compile(PATTERN_EMAIL);

	public void validate(FacesContext context, UIComponent component) 
	{
		if ((context == null) || (component == null)) {
			throw new NullPointerException();
		}
		if (!(component instanceof UIOutput)) {
			return;
		}
		
		Object componentValue = ((UIOutput) component).getValue();
		String value = 
	componentValue == null ? null : componentValue.toString());
		if(value == null)
			return;
		
		if (validateEmailAddress(value)) {
			component.setValid(true);
		} else {
			component.setValid(false);
			Message errMsg = 
			  getMessageResources().getMessage(context, 
			  EMAIL_ADDRESS_INVALID, 
			  (new Object[] {"Sample: name@company.com"}));
			 context.addMessage(component, errMsg);
		}
	}

	private boolean validateEmailAddress(String emailAddress) {
		if(emailAddress == null) return false;
		Matcher matcher = pattern.matcher(emailAddress);
		return matcher.matches();
	}

	/**
	 * This method will be called before calling  
	 * facesContext.addMessage, so message can be localized.
	 * &lt;p&gt;Return the {@link MessageResources} instance for the message
	 * resources defined by the JavaServer Faces Specification.
	 */
	public synchronized MessageResources getMessageResources() {
		MessageResources emailResources = null;
		ApplicationFactory aFactory = 
                  (ApplicationFactory)FactoryFinder.getFactory
                  (FactoryFinder.APPLICATION_FACTORY);
		Application application = aFactory.getApplication();
	
		emailResources = 
  application.getMessageResources("net.jackwind.jsf.EMAIL_ADDRESS_INVALID");
		return (emailResources);
	}
}
</code>
</pre>
<p>Validator 接口只声明了一个要实现的函数： <code>public void validate(FacesContext context, UIComponent component)</code>。如果电子邮件地址是正确的，则调用  <code>component.setValid(true)</code> ；否则调用 <code>component.setValid(false)</code> ，同时一条错误消息将被添加到 <code>FacesContext</code>。 </p>
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