基于xml配置方式实现对action中指定方法进行输入校验

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC
"-//OpenSymphony Group//XWork Validator 1.0.3//EN"
"http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">

<validators>
<field name="user">
<field-validator type="stringlength">
<param name="maxLength">15</param>
<message>用户名长度不能超过15</message>
</field-validator>
</field>
</validators>