==========================web/actions/LoginAction-validation.xml==============
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE validators PUBLIC
"-//OpenSymphony Group//XWork Validator 1.0.2//EN"
"http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">
<validators>
<field name="userName">
<field-validator type="requiredstring">
<message key="userName.null"></message>
</field-validator>
<field-validator type="stringlength">
<param name="minLength">3</param>
<param name="maxLength">7</param>
<message key="userName.length"></message>
</field-validator>
</field>
<field name="password">
<field-validator type="requiredstring">
<message>password is required....</message>
</field-validator>
<field-validator type="regex"> **********
<param name="expression">^[0-9]{6}$</param>
<message>password is invalidate...</message>
</field-validator>
</field>
<field name="repassword">
<field-validator type="requiredstring">
<message>repassword is required....</message>