一 文件名约定:

　　1) 验证XML的文件名: Action类名-validation.xml , 并与相关的Action类放在一起.

　　2) 当一个Action中有多个业务方法时 : Action 类 名-映射名-validation.xml

　　什么是映射名:<action name="login".../> ,name属性的值:login就是映射名, 千万注意,很多人写错

　　例子:

　　URL是:http://localhost/struts/user_addUser. action

　　struts.xml是:

　　Xml代码　　

<action name="user_*" class="ssh.org.web.UserAction" method="{1}"> <result name="success">/user/success.jsp</result> <result name="input">/user/user.jsp</result> </action>

　　匹配后<action name="user_*".../>　 实为<action name="user_addUser" .../>

　　所以验证框架XML文件名是: UserAction-user_addUser -validation.xml

　　二 验证不通过时, 　 会执行addFieldError ()方法,　 在JSP页面, 要用 <s:fielderror />显示信息.

　　关于addFieldError,请看第6讲:6 addActionError与addFieldError

　　三 例子

　　Registration-validation.xml　 : 用于校验Registration.java类

　　Xml代码　　　

<?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><!-- 非字段校验器　 <validator type="requiredstring"> <param name="fieldName">username</param> <message>username should not be blank!</message> </validator> <validator type="stringlength"> <param name="fieldName">username</param> <param name="minLength">6</param> <param name="maxLength">10</param> <message>username should be between ${minLength} and ${maxLength}</message> </validator> --> 字段校验器-->　 <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"> <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> </validators>