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📄 自订验证器.htm

📁 良葛格學習筆記,《jsf入门》简体中文版,对学习JSF有帮助
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<p>自订验证器</p>
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						　您可以自订自己的验证器，所需要的是实作javax.faces.validator.Validator接口，例如我们实作一个简单的密码验证器，检查字符长度，以及密码中是否包括字符与数字：<ul>
							<li>PasswordValidator.java </li>
						</ul>
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								<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">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() &lt; 6) {
            FacesMessage message = <span class="code-keyword">new</span> FacesMessage(
                 FacesMessage.SEVERITY_ERROR,
                 <span class="code-quote">&quot;字符长度小于6&quot;</span>,
                 <span class="code-quote">&quot;字符长度不得小于6&quot;</span>);
            <span class="code-keyword">throw</span> <span class="code-keyword">new</span> ValidatorException(message);
        }

        <span class="code-keyword">if</span>(!password.matches(<span class="code-quote">&quot;.+[0-9]+&quot;</span>)) {
            FacesMessage message = <span class="code-keyword">new</span> FacesMessage(
                   FacesMessage.SEVERITY_ERROR,
                   <span class="code-quote">&quot;密码必须包括字符与数字&quot;</span>,
                   <span class="code-quote">&quot;密码必须是字符加数字所组成&quot;</span>);
            <span class="code-keyword">throw</span> <span class="code-keyword">new</span> ValidatorException(message);
        }
    }
 }</pre>
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						<p>
						　　您要实作javax.faces.validator.Validator接口中的validate()方法，如果验证错误，则丢出一个ValidatorException，它接受一个FacesMessage对象，这个对象接受三个参数，分别表示讯息的严重程度（INFO、
						WARN、ERROR、FATAL）、讯息概述与详细讯息内容，这些讯息将可以使用&lt;h:messages&gt;或&lt;h:
						message&gt;卷标显示在页面上。</p>
						<p>　　接下来要在faces-config.xml中注册验证器的识别（Validater
						ID），要加入以下的内容：</p>
						<ul>
							<li>faces-config.xml </li>
						</ul>
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								<b>faces-config.xml</b></div>
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								<pre class="code-java">&lt;?xml version=<span class="code-quote">&quot;1.0&quot;</span>?&gt;
 &lt;!DOCTYPE faces-config PUBLIC
 <span class="code-quote">&quot;-<span class="code-comment">//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.0//EN&quot;</span>
</span> <span class="code-quote">&quot;http:<span class="code-comment">//java.sun.com/dtd/web-facesconfig_1_0.dtd&quot;</span>&gt;
</span>
 &lt;faces-config&gt;
 ....
    &lt;validator&gt;
        &lt;validator-id&gt;
            onlyfun.caterpillar.Password
        &lt;/validator-id&gt;
        &lt;validator-class&gt;
            onlyfun.caterpillar.PasswordValidator
        &lt;/validator-class&gt;
    &lt;/validator&gt;
 ....
 &lt;/faces-config&gt;</pre>
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						<p>　　要使用自订的验证器，我们可以使用&lt;f:validator&gt;卷标并设定validatorId属性，例如：</p>
						<div class="code" style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
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								<pre class="code-java">....
 &lt;h:inputSecret value=<span class="code-quote">&quot;#{user.password}&quot;</span> required=<span class="code-quote">&quot;<span class="code-keyword">true</span>&quot;</span>&gt;
    &lt;f:validator validatorId=<span class="code-quote">&quot;onlyfun.caterpillar.Password&quot;</span>/&gt;
 &lt;/h:inputSecret&gt;&lt;p&gt;
 ....</pre>
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						<p>
						　　您也可以让Bean自行负责验证的工作，可以在Bean上提供一个验证方法，这个方法没有传回值，并可以接收FacesContext、UIComponent、Object三个参数，例如：</p>
						<ul>
							<li>UserBean.java </li>
						</ul>
						<div class="code" style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
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								<b>UserBean.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.ValidatorException;

 <span class="code-keyword">public</span> class UserBean {
    ....

    <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() &lt; 6) {
            FacesMessage message = <span class="code-keyword">new</span> FacesMessage(
                 FacesMessage.SEVERITY_ERROR,
                 <span class="code-quote">&quot;字符长度小于6&quot;</span>,
                 <span class="code-quote">&quot;字符长度不得小于6&quot;</span>);
            <span class="code-keyword">throw</span> <span class="code-keyword">new</span> ValidatorException(message);
        }

        <span class="code-keyword">if</span>(!password.matches(<span class="code-quote">&quot;.+[0-9]+&quot;</span>)) {
            FacesMessage message = <span class="code-keyword">new</span> FacesMessage(
                   FacesMessage.SEVERITY_ERROR,
                   <span class="code-quote">&quot;密码必须包括字符与数字&quot;</span>,
                   <span class="code-quote">&quot;密码必须是字符加数字所组成&quot;</span>);
            <span class="code-keyword">throw</span> <span class="code-keyword">new</span> ValidatorException(message);
        }
    }
 }</pre>
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						</div>
						<p>　　接着可以在页面下如下使用验证器：</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">.....
 &lt;h:inputSecret value=<span class="code-quote">&quot;#{user.password}&quot;</span>
                required=<span class="code-quote">&quot;<span class="code-keyword">true</span>&quot;</span>
                validator=<span class="code-quote">&quot;#{user.validate}&quot;</span>/&gt;
 ....</pre>
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