1.web.xml中加载DWR框架：
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<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns=""
xmlns:xsi=""
xsi:schemaLocation="
/web-app_2_5.xsd">
<servlet>
<servlet-name>dwr</servlet-name>
<servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>false</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dwr</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
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其中debug属性是测试用的，输入 可以看出生成的util.js，engine.js的路径，在jsp页面引入，发布时候要设置为false！
java类：
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package Hello;
public class Hello {
public String sayHello(String yourName) {
if (yourName == null || "".equals(yourName)) {
yourName = "World";
}
return "Hello " + yourName + "!";
}
}
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配置dwr.xml
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "">
<dwr>
<allow>
<create javascript="Hello" creator="new">
<param name="class" value="Hello.Hello"></param>
</create>
</allow>
</dwr>
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jsp页面：
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<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script type="text/javascript" src="/DWR/dwr/engine.js"></script>
<script type="text/javascript" src="/DWR/dwr/util.js"></script>
<script type="text/javascript" src="/DWR/dwr/interface/Hello.js"></script>
<script type="text/javascript">
function sayHello(yourName) {
var yourName = $("yourName").value;
Hello.sayHello(yourName, callBack);
}
function callBack(data) {
DWRUtil.setValue("show",data);
}
</script>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
Please input your name:<input type="text" id="yourName" />
<input type="button" value="Click Me!" onClick="sayHello();"/>
<br />
<span id="show" style="background-color:#ffff00"></span>
</body>
</html>
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