struts表单验证xml配置文件

<?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="user.username">
    <field-validator type="requiredstring">
        <param name="trim">true</param>
        <message>用户名不能为空</message>
    </field-validator>
    <!-- 验证用户名只能是字母或数字，长度在6-25之内 -->
    <field-validator type="regex">
        <param name="expression">
            <![CDATA[(\w{6,25})]]>
        </param>
        <message>您输入的用户名必须在6-25个字符内，并且只允许字母和数字</message>
    </field-validator>
</field>
<!-- 重点 -->
<field name="user.password">
    <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">18</param>
        <message>密码长度必须在6-18个字符内</message>
    </field-validator>
    
    <field-validator type="fieldexpression">
        <param name="expression"><![CDATA[(user.password==user.repassword)]]></param>
        <message>两次密码必须一致</message>
    </field-validator>
        
</field>
<!-- 重点 -->
<field name="user.age">
    <field-validator type="int">
        <param name="min">0</param>
        <param name="max">150</param>
        <message>年龄范围不正确</message>
    </field-validator>
</field>

<field name="user.email">
    <field-validator type="email">
        <message>邮箱格式不正确：例如(example@163.com)</message>
    </field-validator>
</field>

<field name="user.phone">
    <field-validator type="regex">
        
        <param name="expression"><![CDATA[^(((13[0-9])|(15([0-3]|[5-9]))|(18[0,5-9]))\d{8})|(0\d{2}-\d{7,8})|(0\d{3}-\d{7,8})$]]></param>
        <message>电话号码不符合规范!xxxxxxxxxxx或05xx-xxxxxx或 010-xxxxxxxx</message>
    </field-validator>
</field>

</validators>

1:放置位置和目录结构

2:action

package com.test.action;

import com.opensymphony.xwork2.ActionSupport;
import com.test.bean.Users;

public class RegisterAction extends ActionSupport {
    private Users user;
    @Override
    public String execute() throws Exception {
        
        return SUCCESS;
    }

    public Users getUser() {
        return user;
    }
    public void setUser(Users user) {
        this.user = user;
    }
}

3:index.jsp页面展示

 <form action="<%=path %>/test/registerAction" method="post"><!--必须要带[0]，除[] -->
        用户名:<input type="text" name="user.username"/>${errors["user.username"][0]}<br><br>
        密码：<input type="password" name="user.password"/>${errors["user.password"][0]}<br><br>
        确认密码：<input type="password" name="user.repassword"/>${errors["user.repassword"][0]}<br><br>
        年龄：<input type="text" name="user.age"/>${errors["user.age"][0]}<br><br>
        邮箱：<input type="text" name="user.email"/>${errors["user.email"][0]}<br><br>
        电话：<input type="text" name="user.phone"/>${errors["user.phone"][0]}<br><br>
        <input type="submit" value="提交"/>
    </form>