二、具体的步骤：
<style type="text/css">
span {
color: red;
font-size: 12px;
}
</style>
</head>
<body>
<!-- 错误提示 -->
<!-- <s:fielderror></s:fielderror> -->
<h3>使用RegisterAction-alia-validation.xml进行验证</h3>
<s:form action="reg2" method="post" namespace="/">
用户名：<s:textfield name="user.username" />
<span>${fieldErrors['user.username'][0] }</span>
<br />
密 码：<s:password name="user.password" />
<span>${fieldErrors['user.password'][0] }</span>
<br />
年 龄：<s:textfield name="user.age" />
<span>${fieldErrors['user.age'][0] }</span>
<br />
邮 箱：<s:textfield name="user.email" />
<span>${fieldErrors['user.email'][0] }</span>
<br />
电 话：<s:textfield name="user.phone"
maxlength="11" />
<span>${fieldErrors['user.phone'][0] }</span>
<br />
<s:submit value="提交" />
</s:form>
<s:debug />
</body>
</html>2、编写Action类并配置相关action
public class RegisterActionValidate extends ActionSupport {
private User user;
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
@Override
public String execute() throws Exception {
// 5)配置验证文件ActionName-alias-validation.xml
// ActionName是Action的名称 RegisterAction
// alia表单提交的action的名称
return SUCCESS;
}
}3、在Action类同目录下创建验证文件ActionName-alias-validation.xml
4、使用验证器编写验证规则
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC
"-//Apache Struts//XWork Validator 1.0.3//EN"
"http://struts.apache.org/dtds/xwork-validator-1.0.3.dtd">
<validators>
<field name="user.username">
<field-validator type="requiredstring">
<param name="trim">true</param>
<message>用户名不能为空！</message>
</field-validator>
<field-validator type="stringlength">
<param name="minLength">6</param>
<param name="maxLength">8</param>
<message>用户名必须是在${minLength}~${maxLength}之间的字符！</message>
</field-validator>
</field>
<field name="user.password">
<field-validator type="requiredstring">
<param name="trim">true</param>
<message>密码不能为空！</message>
</field-validator>
<field-validator type="stringlength">
<param name="minLength">6</param>
<param name="maxLength">8</param>
<message>密码必须是在${minLength}~${maxLength}之间的字符！</message>
</field-validator>
</field>
<field name="user.age">
<field-validator type="required">
<message>年龄不能为空！</message>
</field-validator>
<field-validator type="int">
<param name="min">1</param>
<param name="max">120</param>
<message>年龄必须是在${min}~${max}之间的字符！</message>
</field-validator>
</field>
<field name="user.email">
<field-validator type="requiredstring">
<message>Email不能为空！</message>
</field-validator>
<field-validator type="email">
<message>Email格式不正确！比如：(aa@qq.com)</message>
</field-validator>
</field>
<field name="user.phone">
<field-validator type="requiredstring">
<message>手机不能为空！</message>
</field-validator>
<field-validator type="regex">
<param name="regexExpression"><![CDATA[^1[358]\d{9}$]]></param>
<message>手机必须是13,15,18开头的号!</message>
</field-validator>
</field>
</validators>