jar包
web.XML
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
structxml
<?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" /> <package name="user" extends="struts-default" namespace="/user"> <action name="user" class="com.bjsxt.struts2.user.action.UserAction"> <result>/user_add_success.jsp</result> <result name="error">/user_add_error.jsp</result> </action> </package> </struts>
UserAction.java
package com.bjsxt.struts2.user.action; import com.opensymphony.xwork2.ActionSupport; public class UserAction extends ActionSupport { private String name; public String add() { if(name == null || !name.equals("admin")) { this.addFieldError("name", "name is error"); this.addFieldError("name", "name is too long"); //key 和value return ERROR; } return SUCCESS; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
index.JSP
<?xml version="1.0" encoding="GB18030" ?> <%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!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" /> <base href="<%=basePath %>"/> <title>Insert title here</title> </head> <body> 使用addFieldError方法和s:fieldError标签简单处理数据校验 <a href="user/user!add?name=a" >添加用户</a> </body> </html>
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! <s:fielderror fieldName="name" theme="simple"/> <br /> <s:property value="errors.name[0]"/> <s:debug></s:debug> </body> </html>
<s:fielderror fieldName="name" theme="simple"/> 显示出来会是li1的格式 不常用
用s：property显示出来的是字符串 有利于后面的处理
user_add_success.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 Success! </body> </html>