使用Blazeds中的StreamingAMFChannel通道进行通讯-优快云博客

本文介绍了一种使用Blazeds中的StreamingAMFChannel实现客户端与服务器实时通讯的方法。通过创建Servlet程序并配置services-config.xml及messaging-config.xml文件，实现了服务器端消息推送至Flex客户端的功能。

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今天在网上看到一遍通过Blazeds中的StreamingAMFChannel通过进行通讯的方法。非常喜欢，特记录下来以备以后使用。

这个方法是首先建立一个Servlet程序，如下例所示：

import java.io.IOException;
import java.math.BigDecimal;
import java.util.Date;

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

import flex.messaging.MessageBroker;
import flex.messaging.messages.AsyncMessage;
import flex.messaging.util.UUIDUtils;

public class TickCacheServlet extends HttpServlet {

    private static FeedThread thread;

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {

        String cmd = req.getParameter("cmd");
        if (cmd.equals("start")) {
            start();
        }
        if (cmd.equals("stop")) {
            stop();
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        super.doGet(req, resp);
    }

    @Override
    public void destroy() {
        // TODO Auto-generated method stub
        super.destroy();
    }

    @Override
    public void init() throws ServletException {
        // TODO Auto-generated method stub
        super.init();
    }

    public void start() {
        if (thread == null) {
            thread = new FeedThread();
            thread.start();
        }
        System.out.println("start!!");
    }

    public void stop() {
        thread.running = false;
        thread = null;
    }

    public static class FeedThread extends Thread {

        public boolean running = true;

        public void run() {
            MessageBroker msgBroker = MessageBroker.getMessageBroker(null);
            String clientID = UUIDUtils.createUUID();
            int i = 0;
            while (running) {
                UserDto user = new UserDto ();
                user.setId(1);
                user.setName("test");
                user.setDept("财务部")

                user.setCreateDate(new Date());

                System.out.println(i);

                AsyncMessage msg = new AsyncMessage();
                msg.setDestination("user_Tun");
                msg.setHeader("DSSubtopic", "user");
                msg.setClientId(clientID);
                msg.setMessageId(UUIDUtils.createUUID());
                msg.setTimestamp(System.currentTimeMillis());
                msg.setBody(user);
                msgBroker.routeMessageToService(msg, null);
                i++;
                try {
                    Thread.sleep(20);
                } catch (InterruptedException e) {
                }

            }
        }
    }

}

2。设置services-config.xml，在其中加入:

<channel-definition id="my-streaming-amf" class="mx.messaging.channels.StreamingAMFChannel">
            <endpoint url="http://{server.name}:{server.port}/{context.root}/messagebroker/streamingamf" class="flex.messaging.endpoints.StreamingAMFEndpoint"/>
            <properties>
                <idle-timeout-minutes>0</idle-timeout-minutes>
                <max-streaming-clients>10</max-streaming-clients>
                <server-to-client-heartbeat-millis>5000</server-to-client-heartbeat-millis>
                <user-agent-settings>
                    <user-agent match-on="MSIE" kickstart-bytes="2048" max-streaming-connections-per-session="1"/>
                    <user-agent match-on="Firefox" kickstart-bytes="2048" max-streaming-connections-per-session="1"/>
                </user-agent-settings>
            </properties>
        </channel-definition>

messaging-config.xml文件中，加入如下：
    <destination id="user_Tun">
        <properties>
            <server>
                <allow-subtopics>true</allow-subtopics>
                <subtopic-separator>.</subtopic-separator>
            </server>
        </properties>
        <channels>
            <channel ref="my-polling-amf" />
            <channel ref="my-streaming-amf" />
        </channels>
    </destination>

4.Flex执行程序

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" viewSourceURL="srcview/index.html" height="378" width="426">

    <mx:Script>
        <![CDATA[
            import mx.controls.Alert;
            import mx.rpc.events.ResultEvent;
            import mx.messaging.Consumer;
            import mx.messaging.Channel;
            import mx.messaging.ChannelSet;
            import mx.messaging.events.MessageEvent;

            [Bindable]
            public var user:UserVO;

            public function sendmsg():void
            {
                Alert.show("click start");
                var consumer:Consumer = new Consumer();
                consumer.destination = "user_Tun";
                consumer.subtopic = "user";
                consumer.channelSet = new ChannelSet(["my-streaming-amf"]);
                consumer.addEventListener(MessageEvent.MESSAGE, messageHandler);
                consumer.subscribe();
              }

            private function messageHandler(event:MessageEvent):void
            {
                var t:UserVO = event.message.body as UserVO;
                txtName.text = t.name;
            }
        ]]>
    </mx:Script>
    <mx:Panel x="32" y="43" width="362" height="302" layout="absolute" >
        <mx:Label x="72" y="43" text="Label" id="txtName"/>
        <mx:Button x="132" y="41" label="Button" click="sendmsg(); "/>
    </mx:Panel>
</mx:Application>