1、web.xml 配置，在web.xml里面添加如下内容：

		DWR Servlet	dwr-invoker	org.directwebremoting.servlet.DwrServlet		debug	true			pollAndCometEnabled	true		1			dwr-invoker	/dwr/*	

  iwco.dwrs.SendMsg  

3、java类 SendMsg.java

package iwco.dwrs;import java.util.Collection;import org.directwebremoting.ScriptBuffer;import org.directwebremoting.ScriptSession;import org.directwebremoting.WebContext;import org.directwebremoting.WebContextFactory;import org.directwebremoting.proxy.dwr.Util;public class SendMsg {	 @SuppressWarnings("deprecation") 	 public void sendMsg(String msg){	 //得到上下文 	 WebContext contex = WebContextFactory.get(); 	 	 //得到要推送到 的页面 dwr3为项目名称 ， 一定要加上。 	 Collection sessions = contex.getScriptSessionsByPage("/dwrTest/showMsg.jsp");	 	 //不知道该怎么解释这个 ， 	 Util util = new Util(sessions);	 	 //下面是创建一个javascript脚本 ， 相当于在页面脚本中添加了一句 show(msg); 	 ScriptBuffer sb = new ScriptBuffer(); 	 sb.appendScript("show("); 	 sb.appendData(msg); 	 sb.appendScript(")"); 	 	 //推送 	 util.addScript(sb); 	 } }

sendMsg.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%>   			 			 	 	 		

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%>