DWR的基本使用：
1、拷贝dwr.jar文件
2、修改web.xml文件，添加dwr servlet配置：
<servlet>
<servlet-name>dwr-invoker</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-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
3、在web-inf下面添加dwr.xml配置文件：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN"
"http://www.getahead.ltd.uk/dwr/dwr10.dtd">
<dwr>
<allow>
<create javascript="test" creator="new">
<param name="class" value="com.lmning.dwr.DwrTest"></param>
</create>
</allow>
</dwr>
4、创建页面
需引入以下javascript：
<script type="text/javascript" src="dwr/engine.js"></script>
<script type="text/javascript" src="dwr/util.js"></script>
<script type="text/javascript" src="dwr/interface/test.js"></script>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script type="text/javascript" src="dwr/engine.js"></script>
<script type="text/javascript" src="dwr/util.js"></script>
<script type="text/javascript" src="dwr/interface/test.js"></script>
<title>My JSP 'index.jsp' starting page</title>
<script type="text/javascript">
function test1(){
test.hello(helloreturn);
}
function helloreturn(value){
alert(value);
}
</script>
</head>
<body>
<input type="button" value="测试" οnclick="test1()">
</body>
</html>
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