struts2中使用字段校验

<validators>          <field name="password"

<!--input的name-->

        <field-validator type="requiredString">            <param name="trim">true</param>            <message>不能为空</message>        </field-validator>        </field>        <field name="againpassword"        <field-validator type="fieldexpression">            <param name="expression"><![CDATA[againpassword==password]]></param>            <message>My credit limit should be MORE than my girlfriend</message>        </field-validator>        </field>    <!--可利用正则表达式验证--></vaidators>