简单例子：
HTML source:
<p>
Name:
<input type="text" id="demoName"/>
<input value="Send" type="button" onclick="update()"/>
<br/>
Reply: <span id="demoReply"></span>
</p>
Javascript source:
function update() {
var name = dwr.util.getValue("demoName");
Demo.sayHello(name, function(data) {
dwr.util.setValue("demoReply", data);
});
}
Java source:
package org.getahead.dwrdemo.simpletext;
public class Demo {
public String sayHello(String name) {
return "Hello, " + name;
}
}
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="Demo">
<param name="class" value="org.getahead.dwrdemo.simpletext.Demo"/>
</create>
</allow>
</dwr>
其他配置：
1 web.xml:
<listener>
<listener-class>org.directwebremoting.servlet.EfficientShutdownServletContextAttributeListener</listener-class>
</listener>
<listener>
<listener-class>org.directwebremoting.servlet.EfficientShutdownServletContextListener</listener-class>
</listener>
<servlet>
<servlet-name>dwr-invoker</servlet-name>
<servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
<!-- This should NEVER be present in live -->
<init-param>
<param-name>debug</param-name>
<param-value>true</param-value>
</init-param>
<!-- Remove this unless you want to use active reverse ajax -->
<init-param>
<param-name>activeReverseAjaxEnabled</param-name>
<param-value>true</param-value>
</init-param>
<!-- By default DWR creates application scope objects when they are first
used. This creates them when the app-server is started -->
<init-param>
<param-name>initApplicationScopeCreatorsAtStartup</param-name>
<param-value>true</param-value>
</init-param>
<!-- This enables full streaming mode. It's probably better to leave this
out if you are running across the internet -->
<init-param>
<param-name>maxWaitAfterWrite</param-name>
<param-value>-1</param-value>
</init-param>
<!--
For more information on these parameters, see:
- http://getahead.org/dwr/server/servlet
- http://getahead.org/dwr/reverse-ajax/configuration
-->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
2 js文件引入，因为我页面代码放在了index.jsp里面。所以引入js的代码如下：
<script type='text/javascript' src='./tabs/tabs.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='./dwr/interface/Demo.js'> </script>
应该建立一个项目路径。在所有文件里使用统一的路径。