Javascript的调试利器：Firebug使用详解(五)

上一篇“Flex 开发学习笔记1 - 与Flex的亲密接触,秀一下两周的成果”

 

       上篇中show了一下近期作的demo页面，现在讲一讲我使用的架构：

 

       自己原来的项目架构是 WebWork2 + Spring + Hibernate，现在通过FLex替代了WebWrok2来表显视图层，而Flex与Spring通讯采用了BlazeDS这个开源免费的Flex服务程序。

      

       BlazeDS是Adobe公司发布的免费开源产品，与该公司的另一款收费产品LCDS功能相近，应该是LCDS简化开源免费版。目前我通过RemoteObject的方式访问后台Service感觉比较方便。BlazeDS下载地址：http://opensource.adobe.com/wiki/display/blazeds/download+blazeds+3

 

       如何通过RemoteObject访问Spring管理的Bean，我参照另一篇教程文档进行了设计与开发，在这篇文章中，用的是Adobe非免费Flex服务程序，只需要将LCDS中的flex.war换成BlazeDS中的flex.war就可以了。另外，这里有一篇“使用BlazeDS实现Java和Flex通信 ”的文章，讲解了如何在eclipse中配置Flex工程。

 

       以下是一个Flex页面访问RemoteObject的代码：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Script>
<![CDATA[
import mx.rpc.events.ResultEvent;
import mx.controls.Alert;
private function callRO(str:String):void{
Alert.show("flexSpringBeanTest");
firstRO.say(str);
firstRO.addEventListener(ResultEvent.RESULT,getROResult);
}

private function getROResult(e:ResultEvent) :void {
Alert.show(e.result.toString());
}
//flexObjectTest
]]>
</mx:Script>

<mx:RemoteObject id="firstRO" destination="flexSpringBeanTest"/>
<mx:TextInput x="109" y="28" id="input" text="hello!"/>
<mx:Button x="270" y="28" click="callRO(input.text)" label="请求"/>
</mx:Application>

 

   在remote-config.xml配置里，映射一个Spring管理的Bean是这么写的

<destination id="flexSpringBeanTest">
<properties>
<factory>springFactory</factory>
<source>flexObjectTest</source>
</properties>
</destination>

 

    在services-config.xml配置自定义的SpringFactory类,即我们要实现从从spring容器中去取得bean。

<factories>
<factory id="springFactory" class="cn.org.coral.core.flex.factory.FlexSpringFactory" />
</factories>

    这个工厂类的定义:

package cn.org.coral.core.flex.factory;

import flex.messaging.FactoryInstance;
import flex.messaging.FlexFactory;
import flex.messaging.config.ConfigMap;

/**
* 要对某个java类实现自己定义的切入，可以使用工厂配置，需要在ro访问前，从spring里去getbean<br>
*
* @author Libin
*
*/
public class FlexSpringFactory implements FlexFactory{

@Override
public FactoryInstance createFactoryInstance(String id, ConfigMap properties){
SpringFactoryInstance instance = new SpringFactoryInstance(this, id, properties);
instance.setSource(properties.getPropertyAsString(SOURCE, instance.getId()));
return instance;
}
@Override
public Object lookup(FactoryInstance inst)  {
SpringFactoryInstance factoryInstance = (SpringFactoryInstance) inst;
return factoryInstance.lookup();
}

@Override
public void initialize(String arg0, ConfigMap arg1) {
// TODO Auto-generated method stub

}

}

 

该factory需要实现FlexFactory接口。实现createFactoryInstance方法和lookup方法

package cn.org.coral.core.flex.factory;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import flex.messaging.FactoryInstance;
import flex.messaging.config.ConfigMap;
import flex.messaging.services.ServiceException;

public class SpringFactoryInstance extends FactoryInstance
{
SpringFactoryInstance(FlexSpringFactory factory, String id, ConfigMap properties)
{
super(factory, id, properties);
}
public Object lookup()
{
//这就是从spring容器中getbean了
ApplicationContext appContext = WebApplicationContextUtils.getWebApplicationContext(flex.messaging.FlexContext.getServletConfig().getServletContext());
String beanName = getSource();

try
{
return appContext.getBean(beanName);
}
catch (NoSuchBeanDefinitionException nexc)
{
ServiceException e = new ServiceException();
throw e;
}
catch (BeansException bexc)
{
ServiceException e = new ServiceException();
throw e;
}
}

}

 

   后台service的定义：

package cn.org.coral.sample.flex.manager;

public class FlexObjectTest {

public String say(String str){
return "say : " + str;
}

}

 

  spring-context.xml的配置

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>

<bean id="flexObjectTest"
class="cn.org.coral.sample.flex.manager.FlexObjectTest">
</bean>

</beans>