Flex 开发学习笔记2 - 采用的架构 BlazeDS + Spring + Hibernate

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#Flex #Spring #Hibernate #Bean #Adobe

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本文介绍如何使用BlazeDS实现Flex与Spring的集成，包括配置步骤、Flex页面访问远程对象的示例代码，以及如何从Spring容器中获取Bean。

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 >

<?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

Xml代码

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

  <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。

Xml代码

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

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

这个工厂类的定义:

Java代码

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
}
}

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

Java代码

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;
}
}
}

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：

Java代码

package cn.org.coral.sample.flex.manager;
public class FlexObjectTest {
public String say(String str){
return "say : " + str;
}
}

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代码

<? 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 >