Struts2----简单验证

最新推荐文章于 2025-08-13 12:05:35 发布

原创最新推荐文章于 2025-08-13 12:05:35 发布 · 118 阅读

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#Struts #JSP #Apache #XML #XHTML

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struts.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
	<constant name="struts.devMode" value="true"></constant>
	<package name="user" extends="struts-default" namespace="/user">
		<action name="user" class="com.pegasus.web.UserAction">
			<result>/user_add_success.jsp</result>
			<result name="error">/user_add_error.jsp</result>
		</action>
	</package>
</struts>

user_add_error.jsp

<?xml version="1.0" encoding="GB18030" ?>
<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
<%@taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030" />
<title>Insert title here</title>
</head>
<body>
	User Add Error!
	<br />
	-------------------------- 
	<s:fielderror fieldName="name" theme="simple"/>
	<s:fielderror fieldName="name" theme="simple"/> 
	--------------------------
	<s:fielderror fieldName="age" theme="simple"/> 
	--------------------------
	<br />
	<s:property value="errors.name[0]"/><br/>
	<s:property value="errors.age"/>
	<s:debug></s:debug>
</body>
</html>

UserAction.java

package com.pegasus.web;

import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport {
	private String name;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String add() {
		if (name == null || !name.equals("admin")) {
			//设定FieldError,结果为数组的形式.
			//在JSP页面中,通过<s:fielderror fieldName="name"/>打印出所设定的值 
			//如果要得到其中的某个值,可以通过[*]来得到,超过了数组的范围则不显示
			//eg.<s:property value="errors.name[1]"/>
			//如果在JSP中没有指定序号,
			//<s:property value="errors.name[1]"/>
			//则在页面中的结果为
			//[name is error, name is too long]
			this.addFieldError("name", "name is error");
			this.addFieldError("name", "name is too long");
			//可以设定多个数组
			//<s:fielderror fieldName="age"/>
			
			this.addFieldError("age", "no age");
			return ERROR;
		}
		return SUCCESS;

	}
}