• flex+java+blazeds 多通道好文


    http://www.cnblogs.com/noam/archive/2010/08/05/1793504.html

    blazeds, spring3整合实现RPC服务和消息服务

    环境:

      MyEclipse 7.5

      Flash Builder 4 plugin for eclipse

      Tomcat 6

      BlazeDS 4.0.0

      springframework 3.0.3

      Spring-flex整合 org.springframework.flex-1.0.3.RELEASE.jar (适用于spring2.5.6+,blazeds3.2+)

    步骤:

      1. 创建带有Flex支持的Web工程,见通过J2EE Web工程添加Flex项目,进行BlazeDS开发

      2. 导入spring包和spring-flex集成包。

      3. 配置web.xml,配置DispatcherServlet,使用spring进行管理,并将请求映射到MessageBroker。

      4. 创建web-application-config.xml,配置flex服务,主要是在spring中配置MessageBroker。

      5. 创建remoting-destination和 message-destination,修改channel属性。

      6. 创建mxml文件,定义channelSet,注册remote-object和定义Productor, Consumer.

    注意:

      当不使用spring直接配置blazeDS实现RPC和消息服务时,仅需要在remoting-config.xml和messaging-config.xml中配置destination,只要在这些文件中配置了默认通道,mxml文件中不需要再定义channelSet即可执行。而使用spirng时,仅当将default-channels定义在services-config.xml的services标签中才有效,若在services-config.xml的services标签中加载其他配置文件,在这些文件中配置各自的default-channels,会报如下错误:[MessagingError message='×××'artgallerydataservice' either does not exist or the destination has no channels defined (and the application does not define any default channels.)'],原因是没有找到通道。如果仅将通道定义在<flex:message-destination>或<flex:remoting-destination>中,也会出现同样的情况。

      对于以上的两个问题,我觉得几乎不可理解,解决方案是在mxml文件中定义channelSet以找到amf通道。

    项目代码: 

      目录结构: 

       

       Web.xml:

    复制代码
    web.xml
    <?xml version="1.0" encoding="UTF-8"?>
    <web-app version="2.4" 
        xmlns="http://java.sun.com/xml/ns/j2ee" 
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
        xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
        http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
        
        <servlet>
          <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
          <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
          <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/web-application-config.xml</param-value>
          </init-param>
          <load-on-startup>1</load-on-startup>
        </servlet>
        
        <servlet-mapping>
          <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
          <url-pattern>/messagebroker/*</url-pattern>
        </servlet-mapping>
        
      <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
      </welcome-file-list>
    </web-app>
    复制代码

      web-application-config.xml: 

        <flex:message-broker/>是非常重要的,它还有其它的几种表示方法,但以这种最为简单,它通过MessageBrokerHandlerAdapter和HandlerMapping将请求发送给spring管理的MessageBroker。

        注意这里一定要导入spring-flex集成的schemaLocation,remoting-destination和 message-destination也在这里定义。

     web-application-config.xml

    复制代码
    <?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-2.5.xsd
            http://www.springframework.org/schema/flex
            http://www.springframework.org/schema/flex/spring-flex-1.0.xsd">

        <flex:message-broker/>

        <flex:message-destination id="msg_dest"/>
        <bean id="flex_test" class="test.Test">
            <flex:remoting-destination/>
        </bean>
    </beans>
    复制代码

      services-config.xml: 

         这里最重要的是channels的定义和配置。

     services-config.xml

    复制代码
    <?xml version="1.0" encoding="UTF-8"?>
    <services-config>

        <services>
          <default-channels>
            <channel ref="my-amf"/>
          </default-channels>
        </services>

        <security>
            <login-command class="flex.messaging.security.TomcatLoginCommand" server="Tomcat"/>
            <!-- Uncomment the correct app server
            <login-command class="flex.messaging.security.TomcatLoginCommand" server="JBoss">
            <login-command class="flex.messaging.security.JRunLoginCommand" server="JRun"/>        
            <login-command class="flex.messaging.security.WeblogicLoginCommand" server="Weblogic"/>
            <login-command class="flex.messaging.security.WebSphereLoginCommand" server="WebSphere"/>
            -->

            <!-- 
            <security-constraint id="basic-read-access">
                <auth-method>Basic</auth-method>
                <roles>
                    <role>guests</role>
                    <role>accountants</role>
                    <role>employees</role>
                    <role>managers</role>
                </roles>
            </security-constraint>
             -->
        </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>1</polling-interval-seconds>
                </properties>
            </channel-definition>

            <!--
            <channel-definition id="my-http" class="mx.messaging.channels.HTTPChannel">
                <endpoint url="http://{server.name}:{server.port}/{context.root}/messagebroker/http" class="flex.messaging.endpoints.HTTPEndpoint"/>
            </channel-definition>

            <channel-definition id="my-secure-http" class="mx.messaging.channels.SecureHTTPChannel">
                <endpoint url="https://{server.name}:{server.port}/{context.root}/messagebroker/httpsecure" class="flex.messaging.endpoints.SecureHTTPEndpoint"/>
                <properties>
                    <add-no-cache-headers>false</add-no-cache-headers>
                </properties>
            </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>
                <!-- 
                <watch-interval>20</watch-interval>
                <watch-file>{context.root}/WEB-INF/flex/services-config.xml</watch-file>
                <watch-file>{context.root}/WEB-INF/flex/proxy-config.xml</watch-file>
                <watch-file>{context.root}/WEB-INF/flex/remoting-config.xml</watch-file>
                <watch-file>{context.root}/WEB-INF/flex/messaging-config.xml</watch-file>
                <watch-file>{context.root}/WEB-INF/flex/data-management-config.xml</watch-file>
                <touch-file>{context.root}/WEB-INF/web.xml</touch-file>
                 -->
            </redeploy>
        </system>

    </services-config>
    复制代码

      messaging-config.xml, proxy-config.xml, remoting-config.xml:

        略。和blazeDS提供的几乎一样。 

     

       test.Test.java:

        这里只定义了一个方法,用以测试远程方法调用。

     

    复制代码
    package test;

    public class Test {

        public void done(){
            System.out.println("OK.");
        }
    }
    复制代码

       flex_test.mxml: 

        这个不做过多解释。 这里定义了AMFChannel和ChannelSet,避免找不到通道的问题。Productor和Consumer是实现BlazeDS消息服务的两个组件,AsyncMessage是用来发送消息的。

     

    复制代码
    flex_test.mxml
    <?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" minWidth="955" minHeight="600"
                   creationComplete="consumer.subscribe();">
        
        <fx:Script>
            <![CDATA[
                import mx.controls.Alert;
                import mx.messaging.messages.*;
                import mx.messaging.events.*;
                import mx.rpc.events.FaultEvent;
                import mx.rpc.events.ResultEvent;
                
                // Write received message to TextArea control.
                private function messageHandler(event: MessageEvent):void {
                ta.text += event.message.body + " ";
                }
                
                // Compose the message as an instance of AsyncMessage, 
                // then use the Producer.send() method to send it.
                private function sendMessage():void {
                    var message: AsyncMessage = new AsyncMessage();
                    message.body = userName.text + ": " + msg.text;
                    producer.send(message);
                    msg.text = "";
                }
                
                protected function button_clickHandler(event:MouseEvent):void
                {
                    // TODO Auto-generated method stub
                    object.done();
                }
                
                protected function resulth(event:ResultEvent):void
                {
                    label.text="succeed!";
                }
                
                protected function faulth(event:FaultEvent):void
                {
                    label.text="failed!";
                    Alert.show("远程对象调用失败: "+event.fault);
                }
                
            ]]>
        </fx:Script>
        
        <fx:Declarations>
            <!-- 将非可视元素(例如服务、值对象)放在此处 -->
            <mx:AMFChannel id="polling_amf" url="../messagebroker/amfpolling" />
            <mx:ChannelSet id="polling_channel" channels="{[polling_amf]}" />
            <mx:AMFChannel id="amf" url="../messagebroker/amf" />
            <mx:ChannelSet id="amf_channel" channels="{[amf]}" />
            
            <mx:Producer id="producer" destination="msg_dest" channelSet="{polling_channel}"/>
            <mx:Consumer id="consumer" destination="msg_dest" channelSet="{polling_channel}"
                         message="messageHandler(event)"/>
            
            <mx:RemoteObject id="object" destination="flex_test" 
                             channelSet="{amf_channel}" 
                             result="resulth(event);" fault="faulth(event);" />
            
        </fx:Declarations>
        <s:TextArea x="42" y="56" width="289" height="163" id="ta"/>
        <s:Label x="42" y="244" text="User Name"/>
        <s:Label x="43" y="272" text="Message"/>
        <s:TextInput x="120" y="237" width="128" id="userName"/>
        <s:TextInput x="120" y="267" id="msg"/>
        <s:Button x="261" y="237" label="Send" height="52" click="sendMessage();"/>
        <s:Label x="42" y="26" text="Message Content"/>
        <mx:VRule x="411" y="26" height="263"/>
        <s:Button x="468" y="54" label="RPC Service Test" width="148" height="39" id="button" click="button_clickHandler(event)"/>
        <s:Label y="140" text="Guess the Result!" verticalAlign="middle" textAlign="center" width="177" height="79" x="456" id="label"/>
    </s:Application>
    复制代码

      执行结果:

      

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  • 原文地址:https://www.cnblogs.com/zhugexiaobei/p/4467558.html
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