新手问下关于DWR的问题，请高人指点~
现在刚接触DWR，我看了下一些别人写的代码，然后我自己放进MyEclipse里面运行发现点击按钮无法跳转到JAVASCRIPT中写的方法~~请高人能不能详细解释下DWR的过程和为什么我不能跳转额？
<?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">
<display-name>dwrtest</display-name>
<servlet>
<servlet-name>dwr-invoke</servlet-name>
<servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>true</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dwr-invoke</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>Index.jsp</welcome-file>
</welcome-file-list>
</web-app>
<?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">
<display-name>dwrtest</display-name>
<servlet>
<servlet-name>dwr-invoke</servlet-name>
<servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>true</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dwr-invoke</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>Index.jsp</welcome-file>
</welcome-file-list>
</web-app>
三、在web.xml同目录下新建dwr.xml文件，内容如下：
Xml代码
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN" "http://getahead.org/dwr/dwr30.dtd">
<dwr>
<allow>
<create javascript="JDate" creator="new">
<param name="class" value="java.util.Date"/>
</create>
<create javascript="Hello" creator="new">
<param name="class" value="com.dwr.HelloWorld"/>
</create>
</allow>
</dwr>
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN" "http://getahead.org/dwr/dwr30.dtd">
<dwr>
<allow>
<create javascript="JDate" creator="new">
<param name="class" value="java.util.Date"/>
</create>
<create javascript="Hello" creator="new">
<param name="class" value="com.dwr.HelloWorld"/>
</create>
</allow>
</dwr>
四、Index.jsp内容如下：
Php代码
<%@ 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>DWR's HelloWorld</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">
-->
<script type='text/javascript' src='dwr/interface/Hello.js'></script>
<script type='text/javascript' src='dwr/engine.js'></script>
<script type='text/javascript' src='dwr/util.js'></script>
<script type='text/javascript' src='hello.js'></script>
</head>
<body>
<input id="user" type="text"/><input type="button" value="您好" onClick="hello()"><div id="result"></div>
</body>
</html>
<%@ 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>DWR's HelloWorld</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">
-->
<script type='text/javascript' src='dwr/interface/Hello.js'></script>
<script type='text/javascript' src='dwr/engine.js'></script>
<script type='text/javascript' src='dwr/util.js'></script>
<script type='text/javascript' src='hello.js'></script>
</head>
<body>
<input id="user" type="text"/><input type="button" value="您好" onClick="hello()"><div id="result"></div>
</body>
</html>
五、在Index.jsp同目录下新建hello.js文件，内容如下：
Js代码
function hello(){
var user = $('user').value;
Hello.sayHello(user,callback);
}
function callback(msg){
if (typeof window['DWRUtil'] == 'undefined')
window.DWRUtil = dwr.util;
DWRUtil.setValue('result',msg);
}
[解决办法]
dwr最直观的体现就是使得我们可以用javascript调用服务器端的java类，这样可以动态的刷新页面内容.(当然动态改变网页内容有很多方法)
[解决办法]
