struts2.0 有关问题，初学简单例子运行出错_Java Web开发

struts2.0 问题，初学简单例子运行出错

//-------------------
loginAction.java

package com.action;

import com.opensymphony.xwork2.ActionSupport;

public class loginAction extends ActionSupport{
private String username;
    private String password;

    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;
    }

    public String execute(){
        return SUCCESS;
    }
}

//--------------------
login.jsp

<%@ page language="java" contentType="text/html" pageEncoding="GBK"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<title>Insert title here</title>
</head>
<body>
<s:form action="login">
    <s:textfield name="username" label="username"></s:textfield>
    <s:password name="password" label="password"></s:password>
    <s:submit label="submit"></s:submit>
</s:form>
</body>
</html>
//--------------------------------------
result.jsp

<%@ page language="java" contentType="text/html" pageEncoding="GBK"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<title>Insert title here</title>
</head>
<body>
    username:${requestScope.username}
    <br>
    password:${requestScope.password}
</body>
</html>
//---------------------------------
struts.xml

<?xml version="1.0" encoding="GBK" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<package name="struts2" extends="struts-default">
        <action name="login" class="com.action.loginAction">
            <result name="SUCCESS">/result.jsp</result>
        </action>
    </package>
</struts>
//-----------------------------------
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>
//----------------------------------

是从网上摘抄的例子，运行环境是win7 64位 MyEclipse8.5 tomcat7.0 jdk6.0

现在是输入用户名+密码点提交后就报错：

网页报错：
HTTP Status 404 - /struts2/logon.jsp

--------------------------------------------------------------------------------

type Status report

message /struts2/logon.jsp

description The requested resource (/struts2/logon.jsp) is not available.