Struts2内置校验器——完整实例代码

时间：2023-03-09 14:36:41
Struts2内置校验器——完整实例代码

一、校验器的配置风格

1、字段校验器：

<field name="被校验的字段">

<field-validator type="校验器名">

<!--此处需要为不同校验器指定数量不等的校验规则-->

<param name="参数名">参数值</param>

....................

<!--校验失败后的提示信息，其中key指定国际化信息的key-->

<message>校验失败后的提示信息</message>

<!--校验失败后的提示信息:建议用getText("I18Nkey"),否则可能出现Freemarker template Error-->

</field-vallidator>

<!-- 如果校验字段满足多个规则，下面可以配置多个校验器-->

</field>

2、非字段校验器（本实例所使用）：

<validator type="校验器名">

<param name="fieldName">需要被校验的字段</param>

<!--此处需要为不同校验器指定数量不等的校验规则-->          
　　　　<param name="参数名">参数值</param>

<message>校验失败后的提示信息</message>

</validator>

两种配置只是风格上的不同，没有本质区别。

二、实例

　　本注册项目中使用了4个内置校验器。项目只有一个注册页面(register2.jsp)，对应的业务控制器(Register2Action.java)。如果输入的数据经内置验证器验证成功，跳转到success2.jsp。

Struts2内置校验器——完整实例代码

实例步骤如下：

注意：

Register2Action.java和Register2Action-validation.xml在同一个包validatorAction内

register2.jsp和success1.jsp在WebContent下(我用的是Eclipse)同一个文件夹validate内

1、web.xml配置FilterDispatcher

<?xml version="1.0" encoding="UTF-8"?>

<web-app  version="2.4"

    xmlns="http://java.sun.com/xml/ns/j2ee"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee

    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">  

    <filter>

        <!-- 配置Struts2核心Filter的名字 -->

        <filter-name>struts2</filter-name>

        <!-- 配置Struts2核心Filter的实现类 -->

        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>

    </filter>

    <!-- 配置Filter拦截的URL -->

    <filter-mapping>

        <!-- 配置Struts2的核心FilterDispatcher拦截所有用户请求 -->

        <filter-name>struts2</filter-name>

        <url-pattern>/*</url-pattern>

    </filter-mapping>  

</web-app>

2、编写视图组件（JSP页面）

(1)注册页面（register2.jsp）

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"

    pageEncoding="utf-8"%>

<%@ taglib prefix="s" uri="/struts-tags" %>

<!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>用户注册页面</title>

</head>

<body>

    <center>

        请输入信息：

        <hr>

        <s:form action="register2" method="post">

            <table border="1">

                <tr>

                    <td>

                        <s:textfield name="userName" label="姓名" size="16" />

                    </td>

                </tr>

                <tr>

                    <td>

                        <s:password name="userPassword" label="密码" size="18" />

                    </td>

                </tr>

                <tr>

                    <td>

                        <s:password name="ruserPassword" label="再次输入密码" size="18" />

                    </td>

                </tr>

                <tr>

                    <td>

                        <s:textfield name="userAge" label="年龄" size="16" />

                    </td>

                </tr>

                <tr>

                    <td>

                        <s:textfield name="userTelephone" label="电话" size="16" />

                    </td>

                </tr>

                <tr>

                    <td>

                        <s:textfield name="userEmail" label="邮箱" size="16" />

                    </td>

                </tr>

                <tr>

                    <td>

                        <s:submit value="提交" />

                    </td>

                </tr>

            </table>

        </s:form>

    </center>

</body>

</html>

(2)验证成功页面(success2.jsp)

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"

    pageEncoding="utf-8"%>

<%@ taglib prefix="s" uri="/struts-tags" %>

<!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>校验成功</title>

</head>

<body>

    校验通过，用户信息如下：

    <hr>

    姓名：<s:property value="userName" />

    <br>

    密码：<s:property value="userPassword" />

    <br>

    年龄：<s:property value="userAge" />

    <br>

    电话：<s:property value="userTelephone" />

    <br>

    邮箱：<s:property value="userEmail" />

</body>

</html>

3、编写业务控制器(Register2Action.java)

package validatorAction;

import com.opensymphony.xwork2.ActionSupport;

public class Register2Action extends ActionSupport{

    private String userName;

    private String userPassword;

    private String ruserPassword;

    private int userTelephone;

    private int userAge;

    private String userEmail;

    public String getUserName() {

        return userName;

    }

    public void setUserName(String userName) {

        this.userName = userName;

    }

    public String getUserPassword() {

        return userPassword;

    }

    public void setUserPassword(String userPassword) {

        this.userPassword = userPassword;

    }

    public String getRuserPassword() {

        return ruserPassword;

    }

    public void setRuserPassword(String ruserPassword) {

        this.ruserPassword = ruserPassword;

    }

    public int getUserTelephone() {

        return userTelephone;

    }

    public void setUserTelephone(int userTelephone) {

        this.userTelephone = userTelephone;

    }

    public int getUserAge() {

        return userAge;

    }

    public void setUserAge(int userAge) {

        this.userAge = userAge;

    }

    public String getUserEmail() {

        return userEmail;

    }

    public void setUserEmail(String userEmail) {

        this.userEmail = userEmail;

    }

    public String execute(){

        return "success";

    }

}

4、配置struts.xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC

    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"

    "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>    

    <package name="intercept" extends="struts-default">

        <action name="register2" class="validatorAction.Register2Action">

            <result name="input">/validate/register2.jsp</result>

            <result name="success">/validate/success2.jsp</result>

        </action>

    </package>

</struts>

5、内置验证器的验证文件(Register2Action-validation.xml)

<?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>

    <!-- 字符串长度校验器 ，校验userName属性-->

      <validator type="stringlength">

          <param name="fieldName">userName</param>

          <param name="maxLength">16</param>

          <param name="minLength">6</param>

          <message>姓名长度为${minLength}到${maxLength}个字符！</message>

      </validator>

      <!-- 字符串长度校验器 ，校验userPassword属性-->

      <validator type="stringlength">

          <param name="fieldName">userPassword</param>

          <param name="maxLength">16</param>

          <param name="minLength">6</param>

          <message>密码长度为${minLength}到${maxLength}个字符！</message>

      </validator>

      <!-- 字段表达式校验器-->

      <validator type="fieldexpression">

          <param name="fieldName">userPassword</param>

          <param name="expression">

              <!-- 验证两次输入的密码是否相同 -->

              <![CDATA[userPassword==ruserPassword]]>

          </param>

          <message>两次密码不一致！</message>

      </validator>

      <!-- 整数校验器-->

      <validator type="int">

          <param name="fieldName">userAge</param>

          <param name="min">1</param>

          <param name="max">130</param>

          <message>年龄必须在${min}到${max}之间！</message>

      </validator>

      <!-- 整数校验器 -->

      <validator type="int">

          <param name="fieldName">userTelephone</param>

          <param name="min">22222222</param>

          <param name="max">99999999</param>

          <message>电话必须在${min}到${max}之间的八位号码！</message>

      </validator>

  <!-- 邮件地址校验器-->

      <validator type="email">

          <param name="fieldName">userEmail</param>

          <message>请使用正确的邮件格式！</message>

      </validator>

</validators>

如果验证失败：

注意文件命名规则(X-validation.xml)

检查stringlength等属性的大小写，还有字段是否和前面匹配；

查看struts-2.3.28.1\src\xwork-core\src\main\resources\xwork-validator-1.0.3.dtd文件，拷贝前4行代码，因版本而异。

等等……

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