步驟：
1、 引入dwr的依賴
<dependency>
<groupId>org.directwebremoting</groupId>
<artifactId>dwr</artifactId>
<version>3.0.1-RELEASE</version>
</dependency>
2、在 web.xml中進行配置dwr，啟動dwr架構
<listener>
<listener-class>org.directwebremoting.servlet.DwrListener</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>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
3、建立一個 java類
public class DwrHello {
public String say(String name) {
name = "hello:"+name;
System.out.println(name);
return name;
}
}
4、在 WEB-INF目錄下，建立 dwr.xml檔案，進行dwr的詳細配置
<?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>
<!-- 将java對象公布為javascript對象 -->
<create creator="new">
<param name="class" value="org.ljm.dwr.service.DwrHello"/>
</create>
</allow>
</dwr>
5、在需要用到dwr的jsp檔案中，引入dwr引擎和具體功能的js
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>dwr的第一個例子</title>
<!-- 必須引入dwr的引擎，此js檔案由dwr架構提供 -->
<script type="text/javascript" src="<%=request.getContextPath() %>/dwr/engine.js"></script>
<!-- 引入java對象轉成的js ，DwrHello就是類的名字-->
<script type="text/javascript" src="<%=request.getContextPath() %>/dwr/interface/DwrHello.js"></script>
<script type="text/javascript">
/* 像java一樣調用js,函數的最後一個參數是回調函數，用來接收傳回值 */
DwrHello.say("張三",function(data){
alert(data);
});
</script>
</head>
<body>
</body>
</html>
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