struts2 使用Validation框架进行数据验证
网上关于struts2 使用Validation框架进行数据验证的例子很多 这里不一一解释每个文件每行代码是什么意思了主要说一下自己遇到的问题，和以后要注意的情况
1.基于xml文件的配置信息，命名规范需要按照 对应“action的类名-validation”的形式，而非struts.xml中action标签的name属性值
若你的类名叫NewValidateAction，那你的验证文件文件名就是：NewValidateAction-validation.xml
2.文件名必须放在与该类同意目录下才可识别
3.NewValidateAction-validation.xml中的<field>标签，对应的是jsp中要传入的属性元素
4.<field-validator type="requiredstring">类型的意思是，现举几个常用的例子
<validators><field name="user.userName"><!-- 验证字符串不能为空 --><field-validator type="requiredstring"><!-- 去空格 --><param name="trim">true</param><!-- 错误提示信息 --><message>用户名不能为空</message></field-validator><!-- 验证字符串长度 --><field-validator type="stringlength"><param name="minLength">2</param><param name="maxLength">20</param><message>用户名长度应在2到18个字符间</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">18</param><message>密码长度应在6到18个字符之间</message></field-validator></field><field name="user.age"><field-validator type="int"><param name="min">1</param><param name="max">150</param><message>年龄应在1到150之间</message></field-validator></field><!-- 验证字符串为日期类型 --><field name="user.birthday"><field-validator type="date"><param name="min">1900-01-01</param><param name="max">2008-10-16</param><message>出生日期应在1900-01-01到2008-10-16</message></field-validator></field></validators>
结构图如下
http://dl.iteye.com/upload/attachment/0070/8090/e614551a-fabd-3144-8d5c-272fee8664fc.jpg
所用到的struts2.3.4的11个jar包
http://dl.iteye.com/upload/attachment/0070/8101/3a5efedc-7d6e-3337-aee8-c4e5a0e3935a.jpg
附源码
NewValidateAction.java
package action;import com.opensymphony.xwork2.ActionSupport;public class NewValidateAction extends ActionSupport {private String msg; // 必须输入private int age; // 在13和20之间public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}}
NewValidateAction-validation.xml
<?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="msg"><field-validator type="requiredstring"><message>请输入信息</message></field-validator></field><field name="age"><field-validator type="int"><param name="min">13</param><param name="max">20</param><message>必须在13至20之间</message></field-validator></field></validators>
struts.xml
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN""http://struts.apache.org/dtds/struts-2.0.dtd"><struts><package name="demo" extends="struts-default" namespace="/test"><action name="new_validate" class="action.NewValidateAction"><result name="input">/validate_form.jsp</result><result name="success">/validate_form.jsp</result></action></package></struts>
web.xml
<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/javaeehttp://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"><filter><filter-name>struts2</filter-name><filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class></filter><!-- FilterDispatcher用来初始化struts2并且处理所有的WEB请求。 --><filter-mapping><filter-name>struts2</filter-name><url-pattern>/*</url-pattern></filter-mapping><welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list></web-app>
validate_form.jsp
<%@ page language="java" import="java.util.*" pageEncoding="GBK"%><%@ taglib prefix="s" uri="/struts-tags"%><html><head><title>验证数据</title></head><body><s:form action="new_validate" namespace="/test"><s:textfield name="msg" label="姓名" /><s:textfield name="age" label="年龄" /><s:submit /></s:form></body></html>
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