引入服务器端表单验证service，是通过在webx.xml中通过服务引入的方式完成的。例如，在user相关信息的表单验证的产生过程是这样的：webx-user.xml通过 <beans:import resource="user/form.xml" />引入form,xml表单验证配置，在form.xml中，通过services:form开始了表单的验证工作。
Webx表单验证服务主张验证逻辑和页面表现逻辑完全分离。所有的验证规则都写在一个单独的配置文件中 —— 页面模板是不需要关心这些验证规则的。当你需要修改验证规则时，只需要修改独立的配置文件就可以了，并不用修改页面模板。
开始配置表单验证服务。
每个表单验证服务可包含多个groups。
每个group可包含多个fields。
每个field可包含多个validators。 
user/form.xml具体配置如下：
<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:services="http://www.alibaba.com/schema/services"
xmlns:fm-conditions="http://www.alibaba.com/schema/services/form/conditions"
xmlns:fm-validators="http://www.alibaba.com/schema/services/form/validators"
xmlns="http://www.alibaba.com/schema/services/form/validators"
xmlns:beans="http://www.springframework.org/schema/beans"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="
http://www.alibaba.com/schema/services http://localhost:8080/schema/services.xsd
http://www.alibaba.com/schema/services/form/conditions http://localhost:8080/schema/services-form-conditions.xsd
http://www.alibaba.com/schema/services/form/validators http://localhost:8080/schema/services-form-validators.xsd
http://www.springframework.org/schema/beans http://localhost:8080/schema/www.springframework.org/schema/beans/spring-beans.xsd
">
<services:form postOnlyByDefault="true">
<!--
- ===============================================
- 用来检查csrf token。
- ===============================================
-->
<services:group name="csrfTokenCheckGroup">
<services:field name="csrfToken">
<csrf-validator>
<message>提交的数据已过期</message>
</csrf-validator>
</services:field>
</services:group>
<!--
- ===============================================
- 登录表单
- ===============================================
-->
<services:group name="login" extends="csrfTokenCheckGroup">
<services:field name="loginError">
<custom-error id="invalidUserOrPassword">
<message>用户名或密码不正确,请重新输入</message>
</custom-error>
</services:field>
<services:field name="userId" displayName="登录名">
<required-validator>
<message>必须填写 ${displayName}</message>
</required-validator>
</services:field>
<services:field name="password" displayName="密码">
<required-validator>
<message>必须填写 ${displayName}</message>
</required-validator>
</services:field>
</services:group>
<!--
- ===============================================
- 注册表单
- ===============================================
-->
<services:group name="register" extends="csrfTokenCheckGroup">
<services:field name="registerError">
<custom-error id="duplicatedUserId">
<message>登录名“${userId}”已经被人注掉了，请尝试另一个名字</message>
</custom-error>
</services:field>
<services:field name="userId" displayName="登录名">
<required-validator>
<message>必须填写 ${displayName}</message>
</required-validator>
<regexp-validator pattern="^[A-Za-z_][A-Za-z_0-9]*$">
<message>${displayName} 必须由字母、数字、下划线构成</message>
</regexp-validator>
<string-length-validator minLength="4" maxLength="10">
<message>${displayName} 最少必须由${minLength}个字组成，最多不能超过${maxLength}个字</message>
</string-length-validator>
</services:field>
<services:field name="password" displayName="密码">
<required-validator>
<message>必须填写 ${displayName}</message>
</required-validator>
<string-length-validator minLength="4" maxLength="10">
<message>${displayName} 最少必须由${minLength}个字组成，最多不能超过${maxLength}个字</message>
</string-length-validator>
<string-compare-validator notEqualTo="userId">
<message>${displayName} 不能与 ${userId.displayName} 相同</message>
</string-compare-validator>
</services:field>
<services:field name="passwordConfirm" displayName="密码验证">
<required-validator>
<message>必须填写 ${displayName}</message>
</required-validator>
<string-compare-validator equalTo="password">
<message>${displayName} 必须和 ${password.displayName} 相同</message>
</string-compare-validator>
</services:field>
</services:group>
<!--
- ===============================================
- 注册account信息表单
- ===============================================
-->
<services:group name="registerContact" extends="csrfTokenCheckGroup">
<services:field name="firstName" displayName="名字" propertyName="account.firstName">
<required-validator>
<message>必须填写 ${displayName}</message>
</required-validator>
</services:field>
<services:field name="lastName" displayName="姓氏" propertyName="account.lastName">
<required-validator>
<message>必须填写 ${displayName}</message>
</required-validator>
</services:field>
<services:field name="address1" displayName="地址" propertyName="account.address1">
<required-validator>
<message>必须填写 ${displayName}</message>
</required-validator>
</services:field>
<services:field name="address2" displayName="地址" propertyName="account.address2"> </services:field>
<services:field name="city" displayName="城市" propertyName="account.city">
<required-validator>
<message>必须填写 ${displayName}</message>
</required-validator>
</services:field>
<services:field name="zip" displayName="邮编" propertyName="account.zip">
<required-validator>
<message>必须填写 ${displayName}</message>
</required-validator>
<number-validator>
<message>${displayName} 必须是数字</message>
</number-validator>
</services:field>
<services:field name="state" displayName="省份" propertyName="account.state">
<required-validator>
<message>必须填写 ${displayName}</message>
</required-validator>
</services:field>
<services:field name="country" displayName="国家" propertyName="account.country">
<required-validator>
<message>必须填写 ${displayName}</message>
</required-validator>
</services:field>
<services:field name="phone" displayName="电话" propertyName="account.phone">
<required-validator>
<message>必须填写 ${displayName}</message>
</required-validator>
</services:field>
<services:field name="email" displayName="电子邮件" propertyName="account.email">
<required-validator>
<message>必须填写 ${displayName}</message>
</required-validator>
<mail-address-validator>
<message>${displayName} 必须是合法的e-mail</message>
</mail-address-validator>
</services:field>
</services:group>
<!--
- ===============================================
- 注册credit信息表单
- ===============================================
-->
<services:group name="registerCredit" extends="csrfTokenCheckGroup">
<services:field name="creditCardNumber" displayName="信用卡号码"
propertyName="account.creditCardNumber">
<required-validator>
<message>必须填写 ${displayName}</message>
</required-validator>
<number-validator>
<message>${displayName} 必须是数字</message>
</number-validator>
</services:field>
<services:field name="creditCardType" displayName="信用卡类型"
propertyName="account.creditCardType">
<required-validator>
<message>必须填写 ${displayName}</message>
</required-validator>
</services:field>
<services:field name="creditCardExpiryMonth" displayName="信用卡过期月份"
propertyName="account.creditCardExpiryMonth">
<required-validator>
<message>必须填写 ${displayName}</message>
</required-validator>
</services:field>
<services:field name="creditCardExpiryYear" displayName="信用卡过期年份"
propertyName="account.creditCardExpiryYear">
<required-validator>
<message>必须填写 ${displayName}</message>
</required-validator>
</services:field>
</services:group>
</services:form>
</beans:beans>