宣言式验证

声明式验证
如果action的名字是UserController,在UserController所在包目录下添加
UserController-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="loginName">  <field-validator type="requiredstring">   <message>请输入邮箱地址</message>  </field-validator>  <field-validator type="email">   <message>邮箱格式不正确</message>  </field-validator> </field> <field name="name">  <field-validator type="requiredstring">   <message>请输入姓名</message>  </field-validator>  <field-validator type="stringlength">   <param name="minLength">6</param>   <param name="maxLength">20</param>   <message>姓名长度只能在 ${minLength} 和 ${maxLength} 之间.</message>  </field-validator> </field> <field name="password">  <field-validator type="requiredstring">   <message>请输入密码</message>  </field-validator>  <field-validator type="stringlength">   <param name="minLength">6</param>   <param name="maxLength">12</param>   <message>密码长度只能在 ${minLength} 和 ${maxLength} 之间.</message>  </field-validator> </field></validators>

ACTION中不需要验证的方法前加上
@SkipValidation

在页面中使用<s:fielderror/>显示错误信息
验证用户输入有误的话 默认转向input视图

JSP中不用标签可以用如下方式取到fielderror的值

<%@ page import="com.opensymphony.xwork2.*"%><%@ page import="com.opensymphony.xwork2.util.*"%><%@ page import="java.util.*"%><%       ActionContext cxt = ActionContext.getContext();       out.println("<h2>ValueStack</h2>");       ValueStack stack = cxt.getValueStack();       Object uc = stack.findValue("[1].fieldErrors.loginName");       out.print(uc);       List list = (List) stack.getRoot();       for (int i = 0; i < list.size(); i++) {        out.print("<FONT Color='Red'>" + list.get(i) + "</FONT>");        out.println("<BR/>");       }%>

stack.findValue("[1].fieldErrors.loginName");
ValueStack stack是个LIST 取得第一个元素的fieldErrors属性的，
fieldErrors是个MAP 的KEY为loginName的值

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