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Flex+Struts2+Spring整合开发

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关于Flex的整合问题,做一个配置简介,另外对容易出错的地方跟大家说说
如果有错误,感谢大家指正。
(开始之前,我必须承认,题目是个噱头,只要有Spring这个超强粘合剂,多个框架可以很容易整合。)
如果是熟悉Spring MVC则完全不需要使用Struts2,这里为了先前项目的表现层可以平滑过度到Flex,才沿用了Struts2
另外,这里主要讲讲Flex怎么与Spring整合,至于Spring与其他框架整合,不在文章内
1.假定你已经配置好web应用并且增加了BlazeDS和导入spring-flex包(使用到的包会在文章最后展示)
配置web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	id="WebApp_ID" version="2.5">

	<display-name>flexweb</display-name>
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:applicationContext.xml</param-value>
	</context-param>

	<!-- The filter for struts2 -->
	<filter>
		<filter-name>struts2</filter-name>
		<filter-class>
			org.apache.struts2.dispatcher.FilterDispatcher
		</filter-class>
	</filter>

	<listener>
		<listener-class>
			org.springframework.web.context.ContextLoaderListener
		</listener-class>
	</listener>
	<!-- Http Flex Session attribute and binding listener support -->
	<!--
		<listener>
		<listener-class>flex.messaging.HttpFlexSession</listener-class>
		</listener>
	-->

	<!-- MessageBroker Servlet 单独为Flex配置xml-->
	<servlet>
		<servlet-name>flex</servlet-name>
		<servlet-class>
			org.springframework.web.servlet.DispatcherServlet
		</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>
				/WEB-INF/classes/flex-application-config.xml
			</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>

	<!-- The filter mapping for struts2 -->
	<filter-mapping>
		<filter-name>struts2</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

	<!--
	Map all /messagbroker requests to the DispatcherServlet for handling
	-->
	<servlet-mapping>
		<servlet-name>flex</servlet-name>
		<url-pattern>/messagebroker/*</url-pattern>
	</servlet-mapping>

	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>
</web-app>

以上内容实质上是两个Web Framework,一个是Struts2(标记名为struts2),一个是Spring MVC(标记名为flex)
这里Spring MVC为flex的RemotingObject提供映射和Flex与Server通讯MessageBroker类

配置flex-application-config.xml
<?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/> 
	

大家注意到,标签引入http://www.springframework.org/schema/flex/spring-flex-1.0.xsd文件,便可以使用<flex:message-broker/> 标记了。
但是这样写虽然简便,但在初学的时候,还是最好理解它的机制吧
以上的内容可以改写成:
<?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 
<bean id="_messageBroker"
		class="org.springframework.flex.core.MessageBrokerFactoryBean">
		<property name="servicesConfigPath">
			<value>/WEB-INF/flex/services-config.xml</value>
		</property>
	</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>

	<!-- Dispatches requests mapped to a MessageBroker -->
	<bean
		class="org.springframework.flex.servlet.MessageBrokerHandlerAdapter" />


大家注意:
“http://www.springframework.org/schema/flex
  http://www.springframework.org/schema/flex/spring-flex-1.0.xsd">内容被移除”
完全是一个标准的Spring配置文件了。
  这里把之前web.xml的/messagebroker/*映射完全对应到/*=_messageBroker,也就是
org.springframework.flex.core.MessageBrokerFactoryBean类中,生成MessageBroker,而MessageBroker是Flex与Server通信的关键
而MessageBrokerHandlerAdapter适配器会取得MessageBroker的实例,使用endpoint = broker.getEndpoint(endpointPath, contextPath);取得端点
endpoint.service(request, response);发送
如果你熟悉Spring MVC,请原谅我又唠叨一遍- -#
现在通讯问题完毕,那么远程调用呢?
我们接着来:
定义一个java类:
package example.fx;

public class DataBean {

	private String name = "";
	private String params = "";
	public String getName() {
		return this.getClass().getName()+ " : " +name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getParams() {
		return params;
	}
	public void setParams(String params) {
		this.params = params;
	}
}

在flex-application-config.xml中,增加:
当然,你也可以写到Spring的其他配置文件中,例如本文中Spring管理Struts2的那个applicationContext.xml(参照web.xml)
	<bean id="dataBean" class="example.fx.DataBean">
		<property name="params">
			<value>Hello Flex!!!</value>
		</property>
	</bean>

这里只生成了一dataBean的实例,但是前段Flex如何访问呢?
在在flex-application-config.xml中继续增加
    <flex:remoting-destination ref="dataBean" />

这里又是图开发速度,然而这部分可以有如下三种写法,分别是:
a.
	<bean id="dataBean" class="example.fx.DataBean">
            <property name="params">
                <value>Hello Flex!!!</value>
	    </property>
		<flex:remoting-destination />
	</bean>

b.
<flex:remoting-destination ref="dataBean"
		include-methods="read, update" exclude-methods="create, delete"
		channels="my-amf, my-secure-amf" />

c.
	<bean id="product"
		class="org.springframework.flex.remoting.RemotingDestinationExporter">
		<property name="messageBroker" ref="_messageBroker" />
		<property name="service" ref="dataBean" />
		<property name="destinationId" value="dataBean" />
		<property name="includeMethods" value="read, update" />
		<property name="excludeMethods" value="create, delete" />
		<property name="channels" value="my-amf, my-secure-amf" />
	</bean>

当然,dataBean中并没有read, update, create, delete方法,这里只是演示用.
经过这么多繁琐的过程,终于Flex可以访问到Server的java类了。
我们新建一个MXML Application文件
<?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.FaultEvent;
			import mx.rpc.events.ResultEvent;
			private function onResultHandler(event:ResultEvent):void{
				Alert.show(String(event.result), String(example.data));
			}
			private function onFaultHandler(event:FaultEvent):void{
				Alert.show(String(event.fault), "Fault!");
			}
			private function btn_Click1EventHandler(event:MouseEvent):void{
				dbRemote.getName();
			}
			private function btn_Click1EventHandler(event:MouseEvent):void{
				dbRemote.getParams();
			}

		]]>
	</mx:Script>
	<mx:RemoteObject id="dbRemote" destination="dataBean" endpoint="http://localhost:8080/flexweb/messagebroker/amf" result="onResultHandler(event)" fault="onFaultHandler(event)">
	</mx:RemoteObject>
	<mx:Button x="10" id="btn_Click1" label="RemoteClass->getName" click="btn_Click1EventHandler(event)"/>
	<mx:Button x="80" id="btn_Click2" label="RemoteClass->getParams" click="btn_Click2EventHandler(event)"/>
</mx:Application>


  服务器启动后,运行你的MXML Application,点击Flash上的两个按钮,看看结果吧
如果你跟我一样懒
那么配置一下Struts,在URL敲一下地址,不用每次都运行你的MXML文件,特别是为了安全起见,你把MXML文件编译到web/WEB-INF/下的时候
以下是struts.xml
<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
        "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <package name="default" namespace="" extends="struts-default">
        <action name="*" class="com.opensymphony.xwork2.ActionSupport">
            <result name="success">/WEB-INF/page/flex/{1}.swf</result>
            </action>
    </package>
</struts>


有几点说明:
1.flex的四个配置文件完全没有更改,并且使用默认channel.
2.有文章说,在remoting-service配置远程访问
比如:
<?xml version="1.0" encoding="UTF-8"?>
<service id="remoting-service"
	class="flex.messaging.services.RemotingService">

	<adapters>
		<adapter-definition id="java-object"
			class="flex.messaging.services.remoting.adapters.JavaAdapter"
			default="true" />
	</adapters>

	<default-channels>
		<channel ref="my-amf" />
	</default-channels>
        <!-- 远程调用 -->
	<destination id="dataBean">
		<properties>
			<source>example.fx.DataBean</source>
		</properties>
	</destination>
</service>

这种方式和在文章中的flex-application-config.xml配置的
<flex:remoting-destination ref="dataBean" />  是一致的,也就是说,如果你在remoting-service配置了,就不需要在Spring配置文件中,反之亦然,如果你在remoting-service和flex-application-config.xml都配置了,web服务器启动的时候会抛异常,提示你bean id已经注册.
3.有不少文章中,MXML中RomoteObject是这样配置的
<mx:AMFChannel id="myamf" uri="http://localhost:8080/flexweb/messagebroker/amf"/>    
<mx:ChannelSet id="channelSet" channels="{[myamf]}"/>    
<mx:RemoteObject id="dBean"   
   destination="dataBean" channelSet="{channelSet}" result="onResultHandler(event)" fault="onFaultHandler(event)"/>

如果使用默认配置,即remoting-service.xml文件中会有一个默认channel配置,这样写是完全没有必要的,你只需要在
<mx:RemoteObject id="dbRemote" destination="dataBean" endpoint="http://localhost:8080/flexweb/messagebroker/amf"/> 
定义一个server的端点
上面的写法这相当于你另外写了一个AMFChannel,并且使用管道去接(ChannelSet里可以放很多channel)

jar包:
Spring 使用Spring 3.0.0.M2
Struts 使用Struts 2.0.4
Flex 使用默认BlazeDS包和org.springframework.flex-1.0.0.RC2.jar包
稍后设置一下下载地址
----------------------------------------------------------------
BlazeDS:
http://opensource.adobe.com/wiki/display/blazeds/Release+Builds
org.springframework.flex-1.0.0.RC2.jar:

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评论
4 楼 luyaoran 2012-09-13  
挺好的,不过对于外行人来说我还是有点迷糊
3 楼 cl1154781231 2011-07-01  
希望楼主下次给个helloWorld的工程下载
2 楼 jjxboy 2010-03-11  
谢谢楼长,能不能给个下载地址!~~~~
1 楼 menglinxi 2009-12-15  
下载地址呢????

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