dwr入门问题 - ITeye问答

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dwr入门问题3

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>第一个DWR程式</title>
  <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='js/hello.js'></script>
</head>
<body>
 
<input id="user" type="text" />
<input type='button' value='哈喽' onclick='hello();' /> 
 
<div id="result"></div>
 
</body>
</html>

hello.js

// JavaScript Document
function hello() {
	//alert("lalaal");
    var user = $('user').value;
    Hello.hello(user, callback);
}
 
function callback(msg) {
   DWRUtil.setValue('result', msg);
}

Hello.java

package onlyfun.caterpillar;

public class Hello {
	public String hello(String name) {
	      return "Hi, " + name + "! 您的第一个DWR!";
	}
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	<display-name>
	JSPDemo3</display-name>
	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>default.html</welcome-file>
		<welcome-file>default.htm</welcome-file>
		<welcome-file>default.jsp</welcome-file>
	</welcome-file-list>
	<servlet>
    <servlet-name>dwr-invoker</servlet-name>
    <servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class>
    <init-param>
      <description>
      </description>
      <param-name>debug</param-name>
      <param-value>true</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>dwr-invoker</servlet-name>
    <url-pattern>/dwr/*</url-pattern>
  </servlet-mapping>
</web-app>

dwr.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://getahead.org/dwr/dwr20.dtd">
 
<dwr>
	<allow>   
		<create creator="new" javascript="Hello">
      		<param name="class" value="onlyfun.caterpillar.Hello" />
	    </create>
	</allow>
</dwr>

调试报：$ is not found.
是不是dwr根本就没起作用啊？
哪位朋友帮忙解决一下，谢谢了！
问题补充：
现在第一步是过了，要求dwr.jar放在%CATALINA_HOME%\lib目录下。
但是自定义的Hello类还是找不到。

太郁闷了。

DWR