最近在学struts2,尝试第一个例子helloworld ,但就一直不成功，很打击人啊各位帮帮忙吧。该怎么解决_J2EE

最近在学struts2,尝试第一个例子helloworld ,但就一直不成功，很打击人啊，各位帮帮忙吧。
使用的是Tomcat 6.0，jdk 1.6, struts-2.2.3.1

lib 文件下的内容：
commons-fileupload-1.2.2.jar，commons-io-2.0.1.jar，commons-lang-2.5.jar，commons-logging-1.1.1.jar，freemarker-2.3.16.jar，javassist-3.11.0.GA.jar，ognl-3.0.1.jar，struts2-core-2.2.3.1.jar，xwork-core-2.2.3.1.jar

这些配置上都没有问题。文件存放的位置也是正确的，但是，运行时出错。

HTTP Status 404 - /web/Login

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

type Status report

message /web/Login

description The requested resource (/web/Login) is not available.

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

Apache Tomcat/6.0.35

正面是我的代码

web.xml

<?xml version="1.0" encoding="GBK"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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_3_0.xsd">


<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>

<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

</web-app>

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>

<package name="struts2" extends="struts-default">

<action name="hello" class="LoginAction">
<result name="success">/hello.jsp</result>
<result name="error">/error.jsp</result>
</action>

</package>

</struts>

java类

public class LoginAction {
private String username ;
private String password ;
public void setUsername(String username){
this.username = username ;
}
public String getUsername(){
return username ;
}
public void setPassword(String password){
this.password = password ;
}
public String getPassword(){
return password ;
}
public String execute() throws Exception {
if("admin".equals(getUsername()) && "123456".equals(getPassword())){
return "success" ;
}else{
return "failure" ;
}
}
}

正面是几个简单的jsp页面

login.jsp

<%@ page contentType="text/html; charser=gb2312" language="java" %>
<html>
<body>
<form action="Login" method="post">
name:<input type="text" name="username" /><br>