struts2学习之七校验框架--字段校验
struts2学习之七校验框架--字段校验（使用xml文件）
一、xml文件规范
在相应的action的同一包下×××--validation.xml
如RegisterAction对应的校验框架为RegisterAction-validation.xml
若要写对应某个方法的写法如下: RegisterAction-test-validation.xml
当执行该方法时校验顺序RegisterAction-test-validation.xml--->RegisterAction-validation.xml
所以当有多个方法时，最好不要提供总的xml了，这样比较清晰
二、可以根据app中的范例获得xml头部如何写
<?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">
三、可以用firefox打开上面链接中的dtd
上面有对如何写dtd的约束
四、写按“field”的校验框架（一个filed对应一个字段）
<field name="username">
<field-validator type="requiredstring">
<param name="trim">true</param>
<message>username should not be blank!</message>
</field-validator>
<field-validator type="stringlength">
<param name="minLength">6</param>
<param name="maxLength">10</param>
<message>username should be between ${minLength} and ${maxLength}</message>
</field-validator>
</field>
<field name="password">
<field-validator type="requiredstring">
<message>password should not be blank!</message>
</field-validator>
<field-validator type="stringlength">
<param name="minLength">6</param>
<param name="maxLength">10</param>
<message>password should be between ${minLength} and ${maxLength}</message>
</field-validator>
</field>
<field name="repassword">
<field-validator type="requiredstring">
<message>repassword should not be blank!</message>
</field-validator>
<field-validator type="stringlength">
<param name="minLength">6</param>
<param name="maxLength">10</param>
<message>repassword should be between ${minLength} and ${maxLength}</message>
</field-validator>
</field>
<field name="age">
<field-validator type="required">
<message>age should not be blank!</message>
</field-validator>
<field-validator type="int">
<param name="min">1</param>
<param name="max">150</param>
<message>age should be between ${min} and ${max}</message>
</field-validator>
</field>
<field name="birthday">
<field-validator type="required">
<!--此处日期应该是required而不是requiredString，否则会有多余的错误信息，requiredString只适用于字符串-->
<message>birthday should not be blank!</message>
</field-validator>
<field-validator type="date">
<param name="min">2001-01-01</param>
<param name="max">2003-12-31</param>
<message>birthday should be between ${min} and ${max}</message>
</field-validator>
</field>
<field name="graduation">
<field-validator type="required">
<message>graduation should not be blank!</message>
</field-validator>
<field-validator type="date">
<param name="min">2005-01-01</param>
<param name="max">2007-12-31</param>
<message>graduation should be between ${min} and ${max}</message>
</field-validator>
</field>
以上书写的属性值名字如requiredstring可参考xwork.JAR中的vlidators包中default.xml文件中的name
五、校验框架校验错误的信息是放在fieldError里面的，不是放在actionError里的。
当校验信息不复杂推荐用这种xml方式，若特复杂才用validate的方法
六、web开发客户端校验
1、客户端校验javascript
2、服务器端校验-前面阐述的校验都是服务器端校验
3、struts2同样支持客户端校验，但还是比较弱的，比较死板，一般自己编写javascript
用struts2支持客户端校验
要求：1)form的主题（theme）一定不能设置为simple
2)将form的validate属性设置为true，会将我们写的xml文件翻译成javascript文件生成在客户端校验。
4、自己编写javascript校验举例
以下图标
分别对应了方法申明处和调用处
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%> <%@ taglib prefix="s" uri="/struts-tags"%> <% 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 'register2.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"> --> <script type="text/javascript">