Struts2 校验

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC
        "-//Apache Struts//XWork Validator 1.0.2//EN"
        "http://struts.apache.org/dtds/xwork-validator-1.0.2.dtd">

<validators>
    <field name="bean.oldPwd">
        
        <field-validator type="requiredstring">
            <param name="trim">true</param>
            <message><![CDATA[必须输入旧密码]]></message>
        </field-validator>
        <field-validator type="regex">
            <param name="expression"><![CDATA[(([a-zA-Z0-9]{4,21})$)]]></param>
            <message><![CDATA[密码格式不正确！]]></message>
        </field-validator>
        
    </field>
    
    <field name="bean.pwd">
        
        <field-validator type="requiredstring">
            <param name="trim">true</param>
            <message><![CDATA[必须输入新密码]]></message>
        </field-validator>
        <field-validator type="regex">
            <param name="expression"><![CDATA[(([a-zA-Z0-9]{4,21})$)]]></param>
            <message><![CDATA[密码格式不正确！，请输入4~20位的数字和字母的组合]]></message>
        </field-validator>
        
    </field>
    
    <field name="bean.rePwd">
        
        <field-validator type="requiredstring">
            <param name="trim">true</param>
            <message><![CDATA[必须再次输入新旧密码]]></message>
        </field-validator>
        <field-validator type="regex">
            <param name="expression"><![CDATA[(([a-zA-Z0-9]{4,21})$)]]></param>
            <message><![CDATA[密码格式不正确！，请输入4~20位的数字和字母的组合]]></message>
        </field-validator>
        
    </field>
    
    
</validators>