第一、在web.xml里面有如下配置：
<?xml version="1.0" encoding="UTF-8"?><web-app 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" version="2.4"><servlet><servlet-name>dwr-invoker</servlet-name><servlet-class>uk.ltd.getahead.dwr.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></web-app>第二，在web.xml同目录下添加一个dwr.xml文件：javascript 唯一，作为jsp页面的引用
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://www.getahead.ltd.uk/dwr/dwr20.dtd"><dwr><allow><create creator="new" javascript="Hello" ><param name="class" value="com.hoo.entity.Message"/></create></allow></dwr>第三，写一个java类
package com.hoo.entity;public class Message {public String hello(String name) {return "这是" + name + "的第一个dwr"; }}第四，写jsp页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><title>Chat</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <script type="text/javascript" src="${pageContext.request.contextPath}/dwr/engine.js"></script><script type="text/javascript" src="${pageContext.request.contextPath}/dwr/util.js"></script><script type="text/javascript" src="${pageContext.request.contextPath}/dwr/interface/Hello.js"></script><%--<script type="text/javascript" src="chat.js"> </script>--%><script type="text/javascript">function hello() {var user = document.getElementById("user").value;//var user = $('user').value; Hello.hello(user, callback); }function callback(msg) { DWRUtil.setValue('result', msg);}</script></head><body><input id="user" type="text" /><input type='button' value='你好' onclick='hello();' /> <jsp:useBean id="abc" class="com.hoo.entity.Message"></jsp:useBean><jsp:getProperty property="str" name="abc"/><div id="result"></div></body></html>要记得在项目中添加的包有：commons-logging.jar dwr.jar log4j.jar
转载于:https://www.cnblogs.com/kunpengit/archive/2012/03/09/2387519.html
