Flex的RemoteObject改写

一、Flex的RemoteObject的基础知识 
可以使用 Flex RemoteObject 组件来针对 ColdFusion 组件或 Java 类调用方法。 
RemoteObject 组件使用 AMF 协议发送和接收数据，而 WebService 和 HTTPService 组件使用 HTTP 协议。AMF 显著快于 HTTP，但服务器端编码和配置通常更复杂。 
与 HTTPService 和 WebService 组件一样，您可以使用 RemoteObject 组件在应用程序中显示数据库查询结果。也可以使用该组件在数据库中插入、更新和删除数据。在将查询结果返回到应用程序之后，可以将其显示在一个或多个用户界面控件中。 
二、对RemoteObject的改写 
我的工作语言主要是java，这里使用RemoteObject的后台服务程序就是用java编写，传统的RemoteObjec的写法是，在服务端里的配置文件remoting-config.xml里写道： 

Xml代码 ：

       <destination id="MoginDemo">
        <properties>
            <source>bean.MoginDemo </source>
            <scope>application</scope>
        </properties>
       </destination>

Flex代码：

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1	<mx:RemoteObject id="ro" destination="LoginDemo" fault="Alert.show(event.fault.toString())">

我的框架是使用flex+spring+ibatis 
重新改造后： 
添加一个新的配置文件，内容如下：

<?xml version="1.0" encoding="GB2312" ?>
<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">

    <!-- Custom exception translator configured as a Spring bean -->
    <bean id="myExceptionTranslator" class="common.MyServerException" />


    <!-- Bootstraps and exposes the BlazeDS MessageBroker simplest form -->
    <flex:message-broker id="_messageBroker"
        services-config-path="/WEB-INF/flex/services-config.xml">
        <flex:mapping pattern="/messagebroker/*" />
        <flex:exception-translator ref="myExceptionTranslator" />
    </flex:message-broker>

    <!--
        another configuration that Bootstraps and exposes the BlazeDS
        MessageBroker <bean id="mySpringManagedMessageBroker"
        class="org.springframework.flex.core.MessageBrokerFactoryBean">
        <property name="servicesConfigPath"
        value="classpath*:flex/services-config.xml" /> </bean>
    -->
    <!-- Maps request paths at /* to the BlazeDS MessageBroker -->
    <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
        <property name="mappings">
            <value>
                /*=_messageBroker
        </value>
        </property>
    </bean>
</beans>

　这样就把flex的服务器通讯的配置文件和spring兼容。具体的配置使用spring注解的功能，军写入到java文件里，例如：

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@Transactional @Service("userGroupService") @RemotingDestination(channels={"my-amf","my-secure-amf"}) public class UserGroupServiceImpl implements UserGroupService {     @Autowired     @Qualifier("userGroupDao")     private UserGroupDao userGroupDao;           @Autowired     @Qualifier("userDao")     private UserDao userDao;           @Override     public Boolean delUserGroup(Map<String, String> params) {         Boolean isSuccess = true;         try {             userDao.delete(params);             userGroupDao.delete(params);         } catch (Exception e) {             isSuccess = false;             e.printStackTrace();         }         return isSuccess;     }       @Override     public Map<String, String> getUserGroup(Map<String, String> params) {         Map<String, String> userGroup = null;         try {             userGroup = userGroupDao.get(params);         } catch (Exception e) {             e.printStackTrace();         }         return userGroup;     }       @Override     public List<Map<String, String>> getUserGroupList(Map<String, String> params) {         List<Map<String, String>> list = null;         try {             list = userGroupDao.getList(params);         } catch (Exception e) {             e.printStackTrace();         }         return list;            }       @Override     public Boolean updateUserGroup(Map<String, String> params) {         Boolean isSuccess = true;         Object userGroupId = params.get("userGroupId");         try {             if(userGroupId == null){                 userGroupDao.add(params);             }else{                 userGroupDao.update(params);             }         } catch (Exception e) {             isSuccess = false;             e.printStackTrace();         }         return isSuccess;     } }

@RemotingDestination(channels={"my-amf","my-secure-amf"})每个service类里添加这个即可。 

到了Flex这块，我们写了个ServiceFactory.as，代码如下： 

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package common

{

    import mx.collections.ArrayCollection;

    import mx.controls.Alert;

    import mx.messaging.Channel;

    import mx.messaging.ChannelSet;

    import mx.messaging.channels.AMFChannel;

    import mx.rpc.events.FaultEvent;

    import mx.rpc.events.ResultEvent;

    import mx.rpc.remoting.RemoteObject;

    import mx.utils.ObjectProxy;

     

    public class ServiceFactory

    {

        private static var channel:Channel;

         

        public static function getService(serviceName:String):RemoteObject

        {

            if(channel == null)

            {

                channel = new AMFChannel("my-amf", "http://localhost:8080/dispatcher/messagebroker/amf");

            }

            var service:RemoteObject = new RemoteObject();

            var cs:ChannelSet = new ChannelSet();

            cs.addChannel(channel);

            service.channelSet = cs;

            service.destination = serviceName;

            service.addEventListener(FaultEvent.FAULT,showError);

            return service;

        }

         

        private static function showError(e:FaultEvent):void {

            Alert.show(String(e.fault.message), "错误");

        }

    }

}

　flex里的调用方法是：

Actionscript代码：

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1	private var userGroupService:RemoteObject = ServiceFactory.getService('userGroupService');