                        課程
                    
                        /后端開發
                        
                            /Java
                        
                        /使用Struts2+Hibernate開發學生信息管理功能

出現以下問題HTTP Status 404 - There is no Action mapped for namespace [/] and action name [] associated with context path [/StudentMessageControl].

按照教程做，在運行是報錯：

網頁的錯誤信息圖如下：

控制臺錯誤信息圖如下：

struts2.xml的配置文件如下：

<?xml?version="1.0"?encoding="UTF-8"??>
<!DOCTYPE?struts?PUBLIC
	"-//Apache?Software?Foundation//DTD?Struts?Configuration?2.3//EN"
	"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
????<package?name="default"?namespace="/"?extends="struts-default">
????
????</package?>

????
????<package?name="users"?namespace="/users"?extends="default">
??????<action?name="*_*"?class="action.{1}Action"?method="{2}">
?????????<result?name="login_success">/users/Users_login_success.jsp</result>
?????????<result?name="login_failure">/users/Users_login.jsp</result>
??????</action>
????</package>

</struts>

Users_login.jsp如下：

<%@?page?language="java"?import="java.util.*"?contentType="text/html;?charset=utf-8"?%>
<%@?taglib?prefix="s"?uri="/struts-tags"%>
<%
String?path?=?request.getContextPath();
String?basePath?=?request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!--?這是一個html5?doctype聲明?-->
<!DOCTYPE?html>
<html>
<head>
????<meta?charset="UTF-8"?/>
????<title>用戶登錄</title>
????
</head>
<style?type="text/css">
body{
	margin:0px;
	padding:0px;
	overflow:hidden;
}
#wrapper{
	position:absolute;
	width:100%;
	height:100%;
	min-width:1280px;
	min-height:680px;
	overflow-x:hidden;
	overflow-y:hidden;
????background-image:?-moz-linear-gradient(top,#77D1F6,?#2F368F);
????background-image:?-webkit-gradient(linear,?left?top,?left?bottom,?color-stop(0,?#77D1F6),color-stop(1,?#2F368F));
}
#header{
	height:100px;
	width:100%;
}
#logo{
	position:absolute;
	float:left;
	margin-left:5%;
	margin-top:30px;
	height:40px;
	width:160px;
	text-align:center;
}
#heading{
	position:relative;
	float:left;
	margin-left:20%;
	margin-top:-18px;
	height:110px;
	width:60%;
	border-radius:?18px;
	background-color:#1C75BC;
	opacity:0.6;
}
#heading?#title{
	margin-top:40px;
	text-align:center;
	font-family:微軟雅黑;
	font-size:24px;
	font-weight:bold;
}
#heading?#subTitle{
	margin-top:10px;
	text-align:center;
	font-family:Courier?New;
}
#main{
	margin-top:20px;
	height:500px;
	width:100%;
}
#mainBg{
	position:relative;
	float:left;
	margin-left:20%;
	margin-top:0px;
	height:500px;
	width:60%;
????border-radius:?18px;
????background-color:#000000;
????opacity:0.5;
}
#mainPanel{
????position:relative;
	margin:25px;
	height:450px;
????border-radius:?18px;
????background-image:?-moz-linear-gradient(top,#EBEBEB,?#BFBFBF);
????background-image:?-webkit-gradient(linear,?left?top,?left?bottom,?color-stop(0,?#EBEBEB),color-stop(1,?#BFBFBF));
}
#mainPanel?#left{
	float:left;
	border-right:2px?solid?#F6F6F6;
	position:relative;
	top:10%;
	height:80%;
	width:49%;
	border-right-style:groove;
}
#mainPanel?#image{
	position:relative;
	height:256px;
	width:256px;
	left:15%;
	top:12%;
	background-image:url('../images/admin.png');
}
#mainPanel?#right{
	float:left;
	position:relative;
	height:90%;
	width:49%;
	top:5%;
}
#welcome{
	margin-top:20px;
	height:60px;
	width:100%;
	vertical-align:?middle;
	display:?inline-block;
	line-height:?60px;
	text-align:center;
}
#welcome?#welcome-text{
	font-size:38px;
	font-weight:bold;
	font-family:微軟雅黑;
	text-shadow:?0?1px?1px?#F6F6F6;
}
#user-name{
	height:35px;
	width:100%;
	margin-top:20px;
	vertical-align:?middle;
	display:?inline-block;
	line-height:?35px;
}
#user-password{
	margin-top:20px;
	height:35px;
	width:100%;
	vertical-align:?middle;
	display:?inline-block;
	line-height:?35px;
}
#user-checkcode{
	margin-top:20px;
	height:35px;
	width:100%;
	vertical-align:?middle;
	display:?inline-block;
	line-height:?35px;
}
#button-group{
	margin-top:10px;
	height:35px;
	width:100%;
	vertical-align:?middle;
	display:?inline-block;
	line-height:?35px;
	text-align:center;
}
#error-tip{
	margin-top:20px;
	margin-left:5%;
	height:40px;
	width:90%;
	vertical-align:?middle;
	display:?inline-block;
	line-height:?35px;
	text-align:center;
	border-bottom:2px?solid?#F6F6F6;
	border-bottom-style:groove;
}
#error-tip?#tip-text{
	font-size:18px;
	font-weight:bold;
	font-family:微軟雅黑;
	color:red;
}
.item{
	margin-left:20px;
	font-family:微軟雅黑;
	font-size:20px;
	font-weight:bold;
	float:?left;
	width:80px;
	margin-top:?3px;
	text-align:?center;
	text-shadow:?0?1px?1px?#F6F6F6;
}
.input{
	vertical-align:?middle;
	display:?inline-block;
}
#checkcode-img{
	margin-top:3px;
	height:20px;
	width:60px;
}
.form-input{
	height:20px;
}
.btn{
????border:1px?solid?#cccccc;
????cursor:pointer;
????margin:10px?5px;
????height:40px;
	width:80px;
????text-align:center;
????border-radius:?4px;
????border-color:?#636263?#464647?#A1A3A5;
????text-shadow:?0?1px?1px?#F6F6F6;
????background-image:?-moz-linear-gradient(center?top,?#D9D9D9,?#A6A6A6?49%,?#A6A6A6?50%);
????background-image:?-webkit-gradient(linear,?left?top,?left?bottom,?color-stop(0,?#D9D9D9),color-stop(1,?#A6A6A6));
}
#footer{
	margin-top:20px;
	width:100%;
}
#footer?#text{
	text-align:center;
	font-size:14px;
	font-family:微軟雅黑;
	font-weight:bold;
}
</style>
<body>
<div?id="wrapper">
	<div?id="header">
		<div?id="logo"></div>
		<div?id="heading">
			<div?id="title">后臺管理系統</div>
			<div?id="subTitle">Ver?1.0</div>
		</div>
	</div>
	<div?id="main">
		<div?id="mainBg">
			<div?id="mainPanel">
				<div?id="left">
					<div?id="image"></div>
				</div>
				<div?id="right">
					
					<form?name="loginForm"?action="<%=path%>/users/Users_login.action"?method="post">
					<!--?start?of?login?form?-->
					<div?id="welcome">
						<span?id="welcome-text">管&nbsp;理&nbsp;登&nbsp;錄</span>
					</div>
					<div?id="user-name">
						<span?class="item">用戶名:</span>
						<span><input?type="text"?name="username"?class="form-input"></span>
					</div>
					<div?id="user-password">
						<span?class="item">密&nbsp;&nbsp;&nbsp;碼:</span>
						<span?class="input"><input?type="password"?name="password"?class="form-input"></span>
					</div>
					<div?id="button-group">
						<input?type="submit"?class="btn"?value="登錄"/>
						<input?type="reset"?class="btn"?value="重置"/>
					</div>
					<div>
					??<s:fielderror/>?<!--?顯示表單驗證的出錯信息?-->
					</div>
					<!--?end?of?form?-->
					</form>
					
				</div>
			</div>
		</div>
	</div>
	<div?id="footer">
		<div?id="text">Copyright???2009-2015?All?Rights?Reserved?Powered?By?Simoniu</div>
	</div>
</div>
</body>
</html>

目錄結構如下圖：