flex4 + spring + blazeds , 使用anonation(注解)机制，利用push技术的实现例子和过程。

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实现目标：java做后台service，每隔300毫秒，生成一个uuid，以 testJob做为订阅关键词，发布给所有订阅此关键词的flex客户端。

配置过程和源码：

1.修改blazeds自动生成的WEB-INF/flex/services-config.xml文件。由于原来没有polling-amf的定义，所以需要加入。代码如下：

<?xml version="1.0" encoding="UTF-8"?><services-config> <services> <service-include file-path="remoting-config.xml" /> <service-include file-path="proxy-config.xml" /> <service-include file-path="messaging-config.xml" /> </services> <security> <login-command class="flex.messaging.security.TomcatLoginCommand" server="Tomcat"/>   </security> <channels> <channel-definition id="my-amf" class="mx.messaging.channels.AMFChannel"> <endpoint url="http://{server.name}:{server.port}/{context.root}/messagebroker/amf" class="flex.messaging.endpoints.AMFEndpoint"/> </channel-definition> <channel-definition id="my-secure-amf" class="mx.messaging.channels.SecureAMFChannel"> <endpoint url="https://{server.name}:{server.port}/{context.root}/messagebroker/amfsecure" class="flex.messaging.endpoints.SecureAMFEndpoint"/> <properties> <add-no-cache-headers>false</add-no-cache-headers> </properties> </channel-definition> <channel-definition id="my-polling-amf" class="mx.messaging.channels.AMFChannel"> <endpoint url="http://{server.name}:{server.port}/{context.root}/messagebroker/amfpolling" class="flex.messaging.endpoints.AMFEndpoint"/> <properties> <polling-enabled>true</polling-enabled> <polling-interval-seconds>4</polling-interval-seconds> </properties> </channel-definition> <channel-definition id="my-longpolling-amf" class="mx.messaging.channels.AMFChannel"><endpoint url="http://{server.name}:{server.port}/{context.root}/messagebroker/amflongpolling" class="flex.messaging.endpoints.AMFEndpoint"/><properties><polling-enabled>true</polling-enabled><polling-interval-seconds>5</polling-interval-seconds><wait-interval-millis>60000</wait-interval-millis><client-wait-interval-millis>1</client-wait-interval-millis><max-waiting-poll-requests>200</max-waiting-poll-requests> <user-agent-settings><user-agent match-on="MSIE" max-streaming-connections-per-session="1"/><user-agent match-on="MSIE 8" max-streaming-connections-per-session="5"/> <user-agent match-on="Firefox" max-streaming-connections-per-session="1"/><user-agent match-on="Firefox/3" max-streaming-connections-per-session="5"/> <user-agent match-on="Safari" max-streaming-connections-per-session="3"/><user-agent match-on="Chrome" max-streaming-connections-per-session="5"/><user-agent match-on="Opera" max-streaming-connections-per-session="3"/> <user-agent match-on="Opera 8" max-streaming-connections-per-session="7"/><user-agent match-on="Opera 10" max-streaming-connections-per-session="7"/> </user-agent-settings></properties></channel-definition> <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"/> </channel-definition>  </channels> <logging> <target class="flex.messaging.log.ConsoleTarget" level="Error"> <properties> <prefix>[BlazeDS] </prefix> <includeDate>false</includeDate> <includeTime>false</includeTime> <includeLevel>false</includeLevel> <includeCategory>false</includeCategory> </properties> <filters> <pattern>Endpoint.*</pattern> <pattern>Service.*</pattern> <pattern>Configuration</pattern> </filters> </target> </logging> <system> <redeploy> <enabled>false</enabled>  </redeploy> </system></services-config>

2.在spring的配置文件中定义 defaultMessageTemplate class="org.springframework.flex.messaging.MessageTemplate"

之所以要定义这个bean，是为了在做service的时候。可以用注解@Autowired来引入这个MessageTemplate的实例。

3.在web.xml中定义spring和flex的集成。这个配置是使用spring和flex集成时候的配置，和push技术无关。

<servlet> <servlet-name>MessagebrokerServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/classes/META-INF/springFlex.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet>  <servlet-mapping> <servlet-name>MessagebrokerServlet</servlet-name> <url-pattern>/messagebroker/*</url-pattern> </servlet-mapping>   <servlet> <servlet-name>RDSDispatchServlet</servlet-name> <servlet-class>flex.rds.server.servlet.FrontEndServlet</servlet-class> <init-param> <param-name>useAppserverSecurity</param-name> <param-value>false</param-value> </init-param> <init-param> <param-name>messageBrokerId</param-name> <param-value>_messageBroker</param-value> </init-param> <load-on-startup>10</load-on-startup> </servlet> <servlet-mapping id="RDS_DISPATCH_MAPPING"> <servlet-name>RDSDispatchServlet</servlet-name> <url-pattern>/CFIDE/main/ide.cfm</url-pattern> </servlet-mapping>

4.由于web.xml配置中引入了WEB-INF/classes/META-INF/springFlex.xml这个文件，所以在springFlex.xml文件中进行详细配置

5.springFlex.xml文件如下，主要是定义flex:message-destination ,既是监听的数据的关键词

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:flex="http://www.springframework.org/schema/flex" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/flex http://www.springframework.org/schema/flex/spring-flex-1.0.xsd"> <flex:message-broker> <flex:message-service default-channels="my-polling-amf" /> </flex:message-broker> <flex:message-destination id="simple-feed" /> <flex:message-destination id="testJob-feed"/> </beans>

6.编写后台推送的java service bean:

/*********************************************************************** * * TestJob.java * * ****所有， * 受到法律的保护，任何公司或个人，未经授权不得擅自拷贝。 * @copyright Copyright: 2000-2011 * @creator 徐泽宇 <br/> * @create-time 2011-6-27 下午11:51:16 * @revision $Id: * ***********************************************************************/ package com.alcor.test.service.quartz;import java.util.Date;import java.util.UUID;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.flex.messaging.MessageTemplate;import org.springframework.flex.remoting.RemotingDestination;import org.springframework.flex.remoting.RemotingInclude;import org.springframework.scheduling.annotation.Scheduled;import org.springframework.stereotype.Service;import flex.messaging.messages.AsyncMessage;@Service@RemotingDestinationpublic class TestJob {/** * Logger for this class */private static final Logger logger = LoggerFactory.getLogger(TestJob.class);@Autowired MessageTemplate template;private static FeedThread thread;@RemotingIncludepublic void work3 (){if (thread == null) {thread = new FeedThread(template);thread.start();}}public static class FeedThread extends Thread { public boolean running = false; private final MessageTemplate template; public FeedThread(MessageTemplate template) { this.template = template; run(); } @Override public void run() { this.running = true; while (this.running) { logger.debug("testJob-feed send"); this.template.send("testJob-feed", UUID.randomUUID().toString()); // this.template.send("testJob-feed", UUID.randomUUID().toString()); try { Thread.sleep(300); } catch (InterruptedException e) { e.printStackTrace(System.out); } } }}}

注意：这里使用了@Service，@@RemotingDestination 注解和@Autowired MessageTemplate template; 这样就避免了在spring中利用配置文件进行定义bean。

如果要使用spring 配置文件来定义。可以参考下面代码（来自blazeds的官方例子中的spring配置文件）

<bean id="defaultMessageTemplate" class="org.springframework.flex.messaging.MessageTemplate" />  <bean id="simpleFeedStarter" class="org.springframework.flex.samples.simplefeed.SimpleFeed"> <constructor-arg ref="defaultMessageTemplate" /> <flex:remoting-destination /> </bean>

具体的业务实现是在　内联线程类FeedThread 里面的run()中实现。

这要做的目标是为了让这个线程启动，是一定要通过flex的一个客户端连上来，才能启动。而不能随着spring context启动而启动。否则会报告messageBroke没有设置在flexContext之类的错误。

那么：如果我们想后台在没有任何一个客户端连上来的情况下，也要启动这个发送服务应该如何做？

典型场景：后台web应用启动，并且定义了一个定时器。每隔 5s 进行一个逻辑处理，然后把处理结果发送给前台 flex（无论是否有felx客户端连上）

这就需要用下面代码：

public String work2(){if (logger.isDebugEnabled()) {logger.debug("work2() - start"); //$NON-NLS-1$}String m_rtn ="Spring 的TestJob任务work2被调用！" ;String returnString =new Date().toLocaleString()+ m_rtn;//------------------------------------------ MessageBroker msgBroker = MessageBroker.getMessageBroker("_messageBroker"); AsyncMessage am = new AsyncMessage(); am.setDestination("testJob-feed"); //am.setHeader("DSSubtopic", "tick"); am.setClientId(UUID.randomUUID().toString()); String msgID =UUID.randomUUID().toString(); //System.out.println("MESSAGE ID:" + msgID); am.setMessageId(msgID); am.setTimestamp(System.currentTimeMillis()); am.setBody(returnString); if (msgBroker != null) { msgBroker.routeMessageToService(am, null); } //------------------------------------------if (logger.isDebugEnabled()) {logger.debug("work2() - end"); //$NON-NLS-1$}return returnString;}

这个work2 方法可以通过 quartz或者spring 的@Scheduled注解来进行定时器调用。

主要的关键代码是

MessageBroker msgBroker = MessageBroker.getMessageBroker("_messageBroker");

这个就是获得一个 _messageBroker的实例。"_messageBroker"字符串是由 <flex:message-broker > 标签中的id来指定。

如果没有id 指定，则缺省使用 “"_messageBroker"”这个字符串

7.前台的订阅flex程序：

<?xml version="1.0" encoding="utf-8"?><s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx"><fx:Script></fx:Script><fx:Declarations><s:ChannelSet id="cs"><s:StreamingAMFChannel uri="/Aerie/messagebroker/streamingamf"/><s:AMFChannel uri="/Aerie/messagebroker/amflongpolling"/><s:AMFChannel uri="/Aerie/messagebroker/amfpolling"/></s:ChannelSet><mx:Consumer id="consumer" destination="simple-feed" channelSet="{cs}" message="messageHandler(event.message)"/><mx:Consumer id="consumer1" destination="testJob-feed" channelSet="{cs}" message="messageHandler1(event.message)"/></fx:Declarations><s:HGroup><s:Group><s:TextInput id="pushedValue" width="250" verticalCenter="0" horizontalCenter="0"/><s:Button label="spimle-feed 订阅" click="consumer.subscribe()" enabled="{!consumer.subscribed}" verticalCenter="30" horizontalCenter="-50"/><s:Button label="Unsubscribe" click="consumer.unsubscribe()" enabled="{consumer.subscribed}" verticalCenter="30" horizontalCenter="50"/></s:Group><s:Group><s:TextInput id="pushedValue1" width="250" verticalCenter="0" horizontalCenter="0"/><s:Button label="testJob 订阅" click="consumer1.subscribe()" enabled="{!consumer1.subscribed}" verticalCenter="30" horizontalCenter="-50"/><s:Button label="Unsubscribe" click="consumer1.unsubscribe()" enabled="{consumer1.subscribed}" verticalCenter="30" horizontalCenter="50"/></s:Group></s:HGroup></s:Application>

其中关键代码是：

<fx:Declarations><s:ChannelSet id="cs"><s:StreamingAMFChannel uri="/Aerie/messagebroker/streamingamf"/><s:AMFChannel uri="/Aerie/messagebroker/amflongpolling"/><s:AMFChannel uri="/Aerie/messagebroker/amfpolling"/></s:ChannelSet><mx:Consumer id="consumer" destination="simple-feed" channelSet="{cs}" message="messageHandler(event.message)"/><mx:Consumer id="consumer1" destination="testJob-feed" channelSet="{cs}" message="messageHandler1(event.message)"/></fx:Declarations>

注意：

<s:StreamingAMFChannel uri="/Aerie/messagebroker/streamingamf"/>

<s:AMFChannel uri="/Aerie/messagebroker/amflongpolling"/>

<s:AMFChannel uri="/Aerie/messagebroker/amfpolling"/>

这三个通道的设置中用到的

Aerie是代表context名字。

messagebroker 是代码 web.xml中的配置的MessagebrokerServlet中的url-pattern

amfpolling 等是指在services-config.xml文件中设置的 channel-definition 下的endpoint 名字