本来不打算写这些细枝末节的东西了，因为在文档中都有现成的实例，写了也只能自己用来参考，不过这个Validation文档中给的不全，从网上查之后才知道用法。 首先建立一个QuizAction.java文件：
package com.struts2;
import com.opensymphony.xwork2.ActionSupport;
public class QuizAction extends ActionSupport {
private static final long serialVersionUID = -7505437345373234225L;
String name;
int age;
String answer;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getAnswer() {
return answer;
}
public void setAnswer(String answer) {
this.answer = answer;
}
}
相应的需要建立QuizAction-validation.xml文件：
<?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="name">
<field-validator type="requiredstring">
<message>You must enter a name</message>
</field-validator>
</field>
<field name="age">
<field-validator type="int">
<param name="min">13</param>
<param name="max">19</param>
<message>Only people ages 13 to 19 may take this quiz</message>
</field-validator>
</field>
</validators>
接着配置struts.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"
"http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<constant name="struts.devMode" value="true"></constant>
<package name="front" namespace="/" extends="struts-default">
<action name="index" class="com.struts2.QuizAction">
<result>/success.jsp</result>
<result name="error">/error.jsp</result>
<result name="input">/index.jsp</result>
</action>
</package>
</struts>
然后建立三个页面index.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<%
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 '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="index" namespace="/" method="post">
<s:textfield label="Name" name="name"/>
<s:textfield label="Age" name="age"/>
<s:textfield label="Favorite color" name="answer"/>
<s:submit/>
</s:form>
</body>
</html>
error.jsp:body标签中写上error success.jsp:body标签中写success
然后浏览器输入url访问index.jsp页面。填入数据，如果填入数据和validation配置文件中定义的不同，则出现错误就会提示在文件中配置的错误信息。
- from the5fire.com
----EOF-----
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微信公众号：Python程序员杂谈
