DWR一对多发送消息

web.xml中加入代码

<!-- DWR -->
	<servlet>
	   <servlet-name>dwr-invoker</servlet-name>  
	   <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
	    <init-param>
     		<param-name>debug</param-name>
     		<param-value>true</param-value>
	    </init-param>
	    <init-param>  
       		<param-name>pollAndCometEnabled</param-name>  
       		<param-value>true</param-value>  
     	    </init-param> 
     	    <init-param>
    		<param-name>activeReverseAjaxEnabled</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>

dwr.xml中代码

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC
    "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN"
    "http://directwebremoting.org/schema/dwr30.dtd">

<dwr>

  <!-- without allow,DWR isn't allowed to do anything -->
  <allow>
    <create creator="new" javascript="SendMsg">
    	<param name="class">com.action.Test</param>
    </create>
    <convert converter="bean" match="com.model.Books" javascript="Books"/>
  </allow>

</dwr>

sendMsg.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML>
<html>
<head>  
<Meta http-equiv="Content-Type" content="text/html; charset=utf-8">  
<script type="text/javascript" src="/newtest/dwr/util.js"></script>    
<script type="text/javascript" src="/newtest/dwr/engine.js"></script>  
<script type="text/javascript" src="/newtest/dwr/interface/SendMsg.js"></script>   
<script type="text/javascript" src="js/jquery-1.7.2.min.js"></script>   
<script type="text/javascript">  
    $(function(){
	//表示允许使用推送技术
        dwr.engine.setActiveReverseAjax(true);
        dwr.engine.setNotifyServerOnPageUnload(true);  
        $("#but").click(function(){  
            SendMsg.sendMsg(11,$("#msg").val());  
        });   
    });
</script>  
<title>Insert title here</title>  
</head>    
<body>
    <input type="text" id="msg"  />  
    <input type="button" value="发送" id="but" />
    <div id="message" style="width: 200px;height: 200px;border: 1px solid red ; text-align: center; padding: 5px;"></div>  
</body>  
</html>

showMsg.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML>
<html>
<head>  
<Meta http-equiv="Content-Type" content="text/html; charset=utf-8">  
<script type="text/javascript" src="/newtest/dwr/util.js"></script>    
<script type="text/javascript" src="/newtest/dwr/engine.js"></script>
<script type="text/javascript" src="/newtest/dwr/interface/SendMsg.js"></script>   
<script type="text/javascript" src="js/jquery-1.7.2.min.js"></script>   
<script type="text/javascript">  
    $(function(){  
        //表示允许使用推送技术  
        dwr.engine.setActiveReverseAjax(true);
        dwr.engine.setNotifyServerOnPageUnload(true);  
    });
  //通过该方法与后台交互，确保推送时能找到指定用户  
    function onPageLoad(){  
       var userId = '11';  
       SendMsg.saveid(userId);  
     }  
    //推送信息  
    function showMessage(autoMessage){  
    	$("#message").text(autoMessage);  
   }    
</script>  
<title>Insert title here</title>  
</head>    
<body onload="onPageLoad();">  
    <div id="message" style="width: 200px;height: 200px;border: 1px solid red ; text-align: center; padding: 5px;"></div>  
</body>  
</html>

Test.java代码

package com.action;

import java.util.Collection;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;
import org.directwebremoting.Browser;
import org.directwebremoting.ScriptBuffer;
import org.directwebremoting.ScriptSession;
import org.directwebremoting.ScriptSessionFilter;
import org.directwebremoting.WebContextFactory;

public class Test {
	
	public void sendMsg(String userid,String message){  
     final String userId = userid;  
	        final String autoMessage = message;
	        Browser.withAllSessionsFiltered(new ScriptSessionFilter() {  
	            public boolean match(ScriptSession session){  
	                if (session.getAttribute("userId") == null)  
	                    return false;  
	                else  
	                    return (session.getAttribute("userId")).equals(userId);  
	            }  
	        },new Runnable(){  
	              
	            private ScriptBuffer script = new ScriptBuffer();  
	              
	            public void run(){  
	                  
	                script.appendCall("showMessage",autoMessage);  
	                  
	                Collection<ScriptSession> sessions = Browser.getTargetSessions();  
	                  
	                for (ScriptSession scriptSession : sessions){  
	                    scriptSession.addScript(script);  
	                }  
	            }  
	        });  
	    }  
	
	public void saveid(String userId){
		HttpServletRequest request = ServletActionContext.getRequest();
        request.getSession().setAttribute("userId",userId);
		ScriptSession scriptSession = WebContextFactory.get().getScriptSession();  
	    scriptSession.setAttribute("userId",userId);
	}
	
}

原文链接：https://www.f2er.com/ajax/166319.html

DWR一对多发送消息

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