struts2的输入验证框架（xml配置）

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此处为了简便起见和知识重复性的避免，暂不考虑类型转换问题。

第一步：（这一步和其他一样，这里从简）依旧是新建一个web project，命名为checkxml，导入struts2必须的包。在src目录下新建struts.xml，修改web.xml文件。
第二步：将index.jsp改名为reg.jsp（这个不是必须的，事实上也没有必要，此处只是为了便于称呼）。Input.jap的代码如下

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><%@ taglib prefix="s"  uri="/struts-tags"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head><body><s:form action="reg"><s:textfield name="username" label="username"></s:textfield><s:password name="password" label="password"></s:password><s:password name="repassword" label="repassword"></s:password><s:textfield name="age" label="age"></s:textfield><s:textfield name="birthday" label="birthday"></s:textfield><s:textfield name="graduation" label="graduation"></s:textfield><s:submit name="submit"></s:submit><s:reset name="reset"></s:reset></s:form></body></html>

第二步：action
在src目录下新建新建包cn.edu.hdu.action 在其中新建一个RegAction.java文件
代码如下

package cn.edu.hdu.action;import java.util.Calendar;import java.util.Date;import com.opensymphony.xwork2.ActionSupport;public class RegAction  extends ActionSupport{private String username;private String password;private String repassword;private int age;private Date birthday;private Date graduation;public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getRepassword() {return repassword;}public void setRepassword(String repassword) {this.repassword = repassword;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}public Date getGraduation() {return graduation;}public void setGraduation(Date graduation) {this.graduation = graduation;}public String execute() throws Exception{return SUCCESS;}}

第三步：修改struts.xml文件代码如下

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"  "struts.apache.org/dtds/struts-2.0.dtd">          <struts><package name="checkxml" extends="struts-default"><action name="reg" class = "cn.edu.hdu.action.RegAction"><result name="success">/success.jsp</result><result name="input">reg.jsp</result></action></package></struts>

第四步：在WebRoot目录下新建另一个视图 success.jsp 代码如下（此文件在这个效验中基本没有什么作用）

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'success.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>    <body>    恭喜你  验证通过  </body></html>

最后一步，也是本节真正内容所在
在cn.edu.hdu.action目录下新建一个名字与action对应的xml文件
RagAction-validation.xml 代码如下：

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE validators PUBLIC        "-//OpenSymphony Group//XWork Validator 1.0.2//EN"        "//www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">                <!-- 框架校验部分 --><validators><!-- 分别对每一个字段校验 --><field name="username"><!-- 每一种校验标准 --><field-validator type="requiredstring"><!-- field-validator下的一些属性标签  说白了 就是一些传入函数的参数 --><param name="trim">true</param><!-- 出错信息 --><message>username is required</message></field-validator></field><!-- 一下都和username类似 将不做批注 --><field name="password"><!-- 每一种校验标准 --><field-validator type="requiredstring"><!-- field-validator下的一些属性标签  说白了 就是一些传入函数的参数 --><param name="trim">true</param><!-- 出错信息 --><message>password is required</message></field-validator><field-validator type="stringlength"><param name ="minLength">6</param><param name ="maxLength">10</param><message>password should between ${minLength} to ${maxLength}</message></field-validator></field><field name="repassword"><!-- 每一种校验标准 --><field-validator type="requiredstring"><!-- field-validator下的一些属性标签  说白了 就是一些传入函数的参数 --><param name="trim">true</param><!-- 出错信息 --><message>repassword is required</message></field-validator><field-validator type="stringlength"><param name ="minLength">6</param><param name ="maxLength">10</param><message>repassword should between ${minLength} to ${maxLength}</message></field-validator></field><field name="age"><!-- 每一种校验标准 --><field-validator type="int"><param name ="min">1</param><param name ="max">150</param><message>age should between ${min} to ${max}</message></field-validator></field><field name="birthday"><!-- 每一种校验标准 --><field-validator type="requiredstring"><!-- field-validator下的一些属性标签  说白了 就是一些传入函数的参数 --><param name="trim">true</param><!-- 出错信息 --><message>birthday is required</message></field-validator><field-validator type="date"><param name ="min">2000-1-1</param><param name ="max">2010-12-31</param><message>birthday should between ${min} to ${max}</message></field-validator></field><field name="graduation"><!-- 每一种校验标准 --><field-validator type="requiredstring"><!-- field-validator下的一些属性标签  说白了 就是一些传入函数的参数 --><param name="trim">true</param><!-- 出错信息 --><message>graduation is required</message></field-validator><field-validator type="date"><param name ="min">2000-1-1</param><param name ="max">2010-12-31</param><message>graduation should between ${min} to ${max}</message></field-validator></field></validators>