jsp的写法：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<s:fielderror />
<form action="${pageContext.request.contextPath }/addcustomer.action" method="post">
客户姓名 <input type="text" name="name" /> <s:fielderror fieldName="name"/> <br/>
密码 <input type="password" name="password" /><br/>
确认密码 <input type="password" name="repassword" /><br/>
年龄 <input type="text" name="age" /> <br/>
生日 <input type="text" name="birthday" /> <br/>
手机 <input type="text" name="phone" /><br/>
邮箱 <input type="text" name="email" /><br/>
<input type="submit" value="提交" />
</form>
</body>
</html>
xml的写法：
version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators SYSTEM "http://struts.apache.org/dtds/xwork-validator-1.0.3.dtd" PUBLIC "-//Apache Struts//XWork Validator 1.0.3//EN"> -<validators>-
<field name="name">-<field-validator type="requiredstring">
<message>客户姓名不能为空！</message>
</field-validator>
</field>-
<field name="password">-
<field-validator type="requiredstring">
<message>密码不能为空！</message>
</field-validator>-
<field-validator type="stringlength">
<param name="minLength">6</param>
<message>密码长度不能小于6位</message>
</field-validator>
</field>-
<field name="repassword">-
<field-validator type="fieldexpression">-<
param name="expression"> <![CDATA[(password==repassword)]]> </param>
<message>两次密码输入不一致</message>
</field-validator>
</field>-
<field name="age">
-<field-validator type="int"><param name="min">18</param><param name="max">70</param>
<message>客户年龄必须在18到70之间</message>
</field-validator>
</field>-
<field name="birthday">-
<field-validator type="date">
<param name="min">1980-10-10</param><param name="max">2050-10-10</param>
<message>生日必须在指定范围！</message>
</field-validator>
</field>-
<field name="phone">-
<field-validator type="regex">-
<param name="expression"> <![CDATA[^18\d{9}$]]> </param>
<message>手机号必须18开头！</message>
</field-validator>
</field>-
<field name="email">-
<field-validator type="email">
<message>邮箱格式非法！</message></field-validator>
</field>
</validators>
注意，xml效验文件要放在对应action的同级目录下，命名规则如下，比如action的名称为userAction,如果要对userAction的所有方法效验,则xml的名称为，
userAction-validation.xml,如果是仅仅对add方法进行效验，则xml的文件名应为userAction-add-validation.xml
另外注意，在structs.xml文件里，对应的action要配一个result里要配一个input结果集，效验不通过的话，就会跳到这个结果集，用<s:fielderror />可以
捕获相应出错信息。