登录时出现404 报错There is no Action mapped for namespace / and action name login.

<?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>	<package name="struts" extends="struts-default">		<action name="login" class="action.LoginAction">			<result name="SUCCESS">/index.jsp</result>			<result name="ERROR">/login.jsp</result>		</action>	</package></struts>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%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>登录</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><form action="login.action" method = "post">  用户名：<input type = "text" name = "username"><br>    密码：<input type = "password" name ="password"><br>    <input type = "submit" value = "登录"><br>    </form>      </body></html>

package action;import vo.User;import dao.impl.*;import com.opensymphony.xwork2.ActionSupport;public class LoginAction extends ActionSupport{		private User user;	String uer = user.getName();	String pas = user.getPassword();		public String execute() throws Exception{		System.out.println("action");		boolean validated = false;		userDao ud = new userDao();		ud.validateUser(uer, pas);		if(ud!=null){			validated=true;					}		if(validated){			return SUCCESS;		}else{			return ERROR;		}						}}

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