dwr 消息推送

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    package com.src;

    import java.util.Collection;

    import org.directwebremoting.ScriptBuffer;
    import org.directwebremoting.ScriptSession;
    import org.directwebremoting.ServerContext;
    import org.directwebremoting.ServerContextFactory;
    import org.directwebremoting.WebContext;
    import org.directwebremoting.WebContextFactory;
    import org.directwebremoting.proxy.dwr.Util;

    public class MyReverse {
        public void sendMes(String mes){
            System.out.println("kao shi si bestllll...");
            send("系统消息："+mes);
        }
        public void send(final String output) {
            org.directwebremoting.WebContext web = WebContextFactory.get();
            String page = web.getServletContext().getContextPath()+"/client.html";

            Collection sessions = web.getScriptSessionsByPage(page);
            System.out.println("size=="+sessions.size());

            Util utilAll = new Util(sessions);

            utilAll.addFunctionCall("callBack", output); //callBack是client.jsp里面的javascript函数，output是传递过去的参数
            //utilAll.setValue("news_id", output, false);
            //这种方法也可以，直接将client.html里id为news_id的textarea的值设置为output的值
        }

        public void noticeNewOrder(int id) {
            WebContext wctx = WebContextFactory.get();
            ScriptBuffer script = new ScriptBuffer();
            script.appendScript("receiveMessages(")
                    .appendData(id)
                    .appendScript(");");

            ServerContext sctx = ServerContextFactory.get(wctx.getServletContext());
            Collection<ScriptSession> pages = sctx.getScriptSessionsByPage("/DwrEg/client.html");

            for (ScriptSession session : pages) {
                session.addScript(script);
            }
        }

}

Web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
      <servlet-name>dwr-invoke</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>
     <init-param>
         <param-name>activeReverseAjaxEnabled</param-name>
         <param-value>true</param-value>
     </init-param>
     
</servlet>

<servlet-mapping>
     <servlet-name>dwr-invoke</servlet-name>
     <url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
<welcome-file-list>
    <welcome-file>client.html</welcome-file>
</welcome-file-list>
</web-app>

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 javascript="myrevsrse" creator="new">
                <param name="class" value="com.src.MyReverse"/>
            </create>
       </allow>
</dwr>

client.html

<html>
<script type="text/javascript" src="dwr/engine.js"></script>
<script type="text/javascript" src="dwr/util.js"></script>
<head>
<script type="text/javascript">

    function callBack(data){
           alert(data);
        }
    function receiveMessages(id) {
            $('orderNotice').innerHTML = "收到id为" + id + "的新订单!";
            $('orderNotice').show();
        }

</script>
</head>
<body onload="dwr.engine.setActiveReverseAjax(true);">
<textarea rows="20" cols="20" id="news_id"></textarea>
<br />
<div id="orderNotice"></div>
</body>
</html>

dopush.html

<html>
<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/myrevsrse.js"></script>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
<script type="text/javascript">
    function sendnews(){
        var new_content = dwr.util.getValue("newcontent");
        myrevsrse.sendMes(new_content);
    }

    function sendinfo(){
       myrevsrse.noticeNewOrder(12);
    }
</script>
</head>
<body>
<input type="text" name="newcontent">
<input type = "button" value="发消息" onclick="sendnews()"/>
<br />
<input type = "button" value="send 2" onclick="sendinfo()"/>
<br />
</body>
</html>

jar包：commons-logging.jar dwr.jar log4j-1.2.15.jar

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