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UserActionpackage com.lyq.action;import com.opensymphony.xwork2.ActionSupport;
public class UserAction extends ActionSupport{
private static final long serialVersionUID = 1L;
private String username;// 用户名
private String password;// 密码
// 用户登录 
@Override
public String execute() throws Exception {
return SUCCESS;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>用户登录</title>
<style type="text/css">
*{font-size: 12px;}
</style>
</head>
<body>
<s:form action="userAction" method="post">
<s:textfield name="username" label="用户名" required="true"></s:textfield>
<s:password name="password" label="密码" required="true"></s:password>
<s:submit key="submit" value="登录"></s:submit>
</s:form>
</body>
</html>login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>用户登录</title>
</head>
<body>
<s:form action="userAction" method="post">
<s:textfield name="username" label="用户名" required="true"></s:textfield>
<s:password name="password" label="密码" required="true"></s:password>
<s:submit key="submit" value="登录"></s:submit>
</s:form>
</body>
</html>web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<!-- Struts2过滤器 -->
<filter>
<!-- 过滤器名称 -->
<filter-name>struts2</filter-name>
<!-- 过滤器类 -->
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<!-- Struts2过滤器映射 -->
<filter-mapping>
<!-- 过滤器名称 -->
<filter-name>struts2</filter-name>
<!-- 过滤器映射 -->
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>struts.xml
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"
"http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<!-- 声明包 -->
<package name="myPackge" extends="struts-default">
<!-- 配置UserAction -->
<action name="userAction" class="com.lyq.action.UserAction">
<!-- 用户登录页面 -->
<result name="input">/login.jsp</result>
<!-- 注册成功页面 -->
<result>/success.jsp</result>
</action>
</package>
</struts>

UserAction-validation.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC 
"-//OpenSymphony Group//XWork Validator 1.0.3//EN" 
"http://www.opensymphony.com/xwork/xwork-validator-1.0.3.dtd" >
<validators>
<!-- 验证用户名 -->
<field name="username">
<field-validator type="requiredstring">
<message>请输入用户名</message>
</field-validator>
</field>
<!-- 验证密码 -->
<field name="password">
<field-validator type="requiredstring">
<message>请输入密码</message>
</field-validator>
</field>
</validators>网上的答案收了一下午加一夜晚 没收到答案，就求解释