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