struts2默认校验器介绍

1、required：必填校验器，要求字段必须有值！

<validator name="required" name="code"><validator name="requiredstring" name="code"><validator name="int" name="code"><validator name="long" name="code"><validator name="double" name="code"><validator name="date" name="code"><validator name="expression" name="code"><!-- 要校验的属性为rpass --><field name="rpass">    <!-- 使用fieldexpression校验器 -->    <field-validator type="fieldexpression">        <param name="expression"><![CDATA[(rpass == password)]]></param>        <message>两次密码不相同!</message>    </field-validator></field>

<validator name="fieldexpression" name="code"><validator name="url" name="code"><validator name="email" class="com.opensymphony.xwork2.validator.validators.EmailValidator"/>

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