<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>新建网页 1</title>
</head>
<body>
<p>自订转换, 验证标签</p>
<div id="PageContent">
<table cellSpacing="0" cellPadding="0" width="100%" border="0" id="table3">
<tr>
<td class="pagebody" vAlign="top">
<table style="CLEAR: both" cellSpacing="0" cellPadding="0" width="100%" border="0" id="table4">
<tr>
<td class="pagecontent" vAlign="top" width="100%">
<div class="wiki-content">
在 <span class="nobr">
<a title="Visit page outside Confluence" rel="nofollow" href="http://www.javaworld.com.tw/confluence/pages/viewpage.action?pageId=2694">
自订验证器<sup><img class="rendericon" height="7" alt="" src="http://www.javaworld.com.tw/confluence/images/icons/linkext7.gif" width="7" align="absMiddle" border="0"></sup></a></span>
中，我们的验证器只能验证一种pattern（.+[0-9]+），我们希望可以在JSF页面上自订匹配的pattern，然而由于我们使用<f:
validator>这个通用的验证器标签，为了要能提供pattern属性，我们可以使用<f:attribute>标签来设置，例如：<div class="code" style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
<div class="codeContent">
<pre class="code-java">....
<h:inputSecret value=<span class="code-quote">"#{user.password}"</span> required=<span class="code-quote">"<span class="code-keyword">true</span>"</span>>
<f:validator validatorId=<span class="code-quote">"onlyfun.caterpillar.Password"</span>/>
<f:attribute name=<span class="code-quote">"pattern"</span> value=<span class="code-quote">".+[0-9]+"</span>/>
</h:inputSecret><p>
....</pre>
</div>
</div>
<p> 使用<f:attribute>卷标来设定属性，接着我们可以如下取得所设定的属性：</p>
<div class="code" style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
<div class="codeContent">
<pre class="code-java">....
<span class="code-keyword">public</span> void validate(FacesContext context,
UIComponent component,
<span class="code-object">Object</span> obj)
<span class="code-keyword">throws</span> ValidatorException {
....
<span class="code-object">String</span> pattern = (<span class="code-object">String</span>)
component.getAttributes().get(<span class="code-quote">"pattern"</span>);
....
}
....</pre>
</div>
</div>
<p> 您也可以开发自己的一组验证卷标，并提供相关属性设定，这需要了解JSP Tag
Library的撰写，所以请您先参考 <span class="nobr">
<a title="Visit page outside Confluence" rel="nofollow" href="http://www.javaworld.com.tw/confluence/pages/viewpage.action?pageId=869">
JSP/Servlet<sup><img class="rendericon" height="7" alt="" src="http://www.javaworld.com.tw/confluence/images/icons/linkext7.gif" width="7" align="absMiddle" border="0"></sup></a></span>
中有关于JSP Tag Library的介绍。</p>
<p>
要开发验证器转用标签，您可以直接继承javax.faces.webapp.ValidatorTag，这个类别可以帮您处理大部份的细节，您所需要的，就是重新定义它的createValidator()方法，我们以改写
<span class="nobr">
<a title="Visit page outside Confluence" rel="nofollow" href="http://www.javaworld.com.tw/confluence/pages/viewpage.action?pageId=2694">
自订验证器<sup><img class="rendericon" height="7" alt="" src="http://www.javaworld.com.tw/confluence/images/icons/linkext7.gif" width="7" align="absMiddle" border="0"></sup></a></span>
中的PasswordValidator为例：</p>
<ul>
<li>PasswordValidator.java </li>
</ul>
<div class="code" style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
<div class="codeHeader" style="BORDER-BOTTOM-STYLE: solid">
<b>PasswordValidator.java</b></div>
<div class="codeContent">
<pre class="code-java"><span class="code-keyword">package</span> onlyfun.caterpillar;
<span class="code-keyword">import</span> javax.faces.application.FacesMessage;
<span class="code-keyword">import</span> javax.faces.component.UIComponent;
<span class="code-keyword">import</span> javax.faces.context.FacesContext;
<span class="code-keyword">import</span> javax.faces.validator.Validator;
<span class="code-keyword">import</span> javax.faces.validator.ValidatorException;
<span class="code-keyword">public</span> class PasswordValidator <span class="code-keyword">implements</span> Validator {
<span class="code-keyword">private</span> <span class="code-object">String</span> pattern;
<span class="code-keyword">public</span> void setPattern(<span class="code-object">String</span> pattern) {
<span class="code-keyword">this</span>.pattern = pattern;
}
<span class="code-keyword">public</span> void validate(FacesContext context,
UIComponent component,
<span class="code-object">Object</span> obj)
<span class="code-keyword">throws</span> ValidatorException {
<span class="code-object">String</span> password = (<span class="code-object">String</span>) obj;
<span class="code-keyword">if</span>(password.length() < 6) {
FacesMessage message = <span class="code-keyword">new</span> FacesMessage(
FacesMessage.SEVERITY_ERROR,
<span class="code-quote">"字符长度小于6"</span>, <span class="code-quote">"字符长度不得小于6"</span>);
<span class="code-keyword">throw</span> <span class="code-keyword">new</span> ValidatorException(message);
}
<span class="code-keyword">if</span>(pattern != <span class="code-keyword">null</span> && !password.matches(pattern)) {
FacesMessage message = <span class="code-keyword">new</span> FacesMessage(
FacesMessage.SEVERITY_ERROR,
<span class="code-quote">"密码必须包括字符与数字"</span>,
<span class="code-quote">"密码必须是字符加数字所组成"</span>);
<span class="code-keyword">throw</span> <span class="code-keyword">new</span> ValidatorException(message);
}
}
}</pre>
</div>
</div>
<p>
主要的差别是我们提供了pattern属性，在validate()方法中进行验证时，是根据我们所设定的pattern属性，接着我们继承javax.faces.webapp.ValidatorTag来撰写自己的验证标签：</p>
<div class="code" style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
<div class="codeHeader" style="BORDER-BOTTOM-STYLE: solid">
<b>PasswordValidatorTag.java</b></div>
<div class="codeContent">
<pre class="code-java"><span class="code-keyword">package</span> onlyfun.caterpillar;
<span class="code-keyword">import</span> javax.faces.application.Application;
<span class="code-keyword">import</span> javax.faces.context.FacesContext;
<span class="code-keyword">import</span> javax.faces.validator.Validator;
<span class="code-keyword">import</span> javax.faces.webapp.ValidatorTag;
<span class="code-keyword">public</span> class PasswordValidatorTag <span class="code-keyword">extends</span> ValidatorTag {
<span class="code-keyword">private</span> <span class="code-object">String</span> pattern;
<span class="c
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《JSF入门》简体中文版.rar （54个子文件） 
《JSF入门》简体中文版 
动作事件.htm 10KB 自订 Renderer.htm 13KB 编码, 译码.htm 11KB 自订转换器.htm 13KB 错误讯息处理.htm 12KB 使用自订组件.htm 5KB TableModel 类别.htm 8KB 自订验证器.htm 8KB Backing Beans.htm 5KB 选择类标签 二.htm 6KB 命令类标签.htm 3KB 输入类标签.htm 2KB 简单的导航 Navigation.htm 9KB Beans 上的 List, Map.htm 5KB 自订转换, 验证标签.htm 16KB 其它标签.htm 6KB 表头, 表尾.htm 6KB 组件卷标.htm 11KB 简介JSF.htm 9KB 简介 JSF 标准标签.htm 5KB 值变事件.htm 10KB 概述自订组件.htm 4KB JSF Expression Language.htm 14KB JSF 生命周期.htm 5KB images 
selectionTag1-1.jpg 1KB selectionTag1-4.jpg 3KB standardConverters-1.jpg 7KB immediateEvents-2.jpg 9KB selectionTag1-2.jpg 3KB selectionTag1-3.jpg 3KB
linkext7.gif 166B docs_16.gif 614B immediateEvents-1.jpg 10KB selectionTag1-5.jpg 1KB standardConverters-2.jpg 8KB Thumbs.db 45KB tablemodel-1.jpg 9KB encodeDecode-1.jpg 2KB selectionTag1-6.jpg 2KB headerfooter-2.jpg 7KB selectionTag1-8.jpg 1KB selectionTag1-7.jpg 2KB selectionTag1-9.jpg 1KB 标准转换器.htm 8KB 选择类标签 一.htm 9KB 实时事件.htm 14KB 简单的表格.htm 9KB Phase 事件.htm 7KB 输出类标签.htm 5KB 国际化讯息.htm 9KB 第一个JSF程序.htm 9KB 导航规则设置.htm 6KB JSF入门.htm 7KB 标准验证器.htm 6KB
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