抛弃LCDS和FMS，在tomcat下开发Red5应用(第六篇)-如何使用RemoteObject

找到这个资料Calling Java methods from Flex using mx:RemoteObject and Red5，立即下载下来，运行了一把，成功。现在我们从头配置一个类似的项目。

1.在Eclipse中新建web项目"emeetings"，参照第二篇（建立新的Red5应用）中的方法，还是再讲一遍吧：

(1).在Eclipse下新建一个web应用，起名叫emeetings。

(2).把在http://dl.fancycode.com/red5/0.6.3/war/ 下载的是java5目录下的三个war(ROOT.war、admin.war、echo.war)中的ROOT.war解压出来，先拷贝所有解压文件到Eclipse的emeetings项目的WebRoot目录下，然后将解压文件夹\WEB-INF\classes下的*.properties、*.xml等配置文件拷贝到项目的src目录下，最后将解压文件夹\WEB-INF\classes下的所有class文件打包成red5-0.6.3-java5.jar(不会打的在附件下载)放到Eclipse的emeetings项目的WebRoot\WEB-INF\lib目录。

2.编写上下文类文件"Application.java"：

package net.xicp.cnfire.red5.remoteobject;

import org.red5.server.adapter.ApplicationAdapter;

public class Application extends ApplicationAdapter {   
	public String getMsg() {
		return "this msg from server";
	}
}

 

3.配置该项目的spring配置文件(remoteobject-web.xml)：

<?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="web.context.emeetings" class="org.red5.server.Context">
		<property name="scopeResolver" ref="red5.scopeResolver" />
		<property name="clientRegistry" ref="global.clientRegistry" />
		<property name="serviceInvoker" ref="global.serviceInvoker" />
		<property name="mappingStrategy" ref="global.mappingStrategy" />
	</bean>
	
	<bean id="web.scope.emeetings" class="org.red5.server.WebScope" init-method="register">
		<property name="server" ref="red5.server" />
		<property name="parent" ref="global.scope" />
		<property name="context" ref="web.context.emeetings" />
		<property name="handler" ref="web.handler.emeetings" />
		<property name="contextPath" value="/emeetings" />
		<property name="virtualHosts" value="*,localhost, localhost:8080, 127.0.0.1:8080" />
	</bean>

	<bean id="web.handler.emeetings" class="net.xicp.cnfire.red5.remoteobject.Application"/>
	<!-- enable support for mx:RemoteObject requests -->
	<bean id="flexMessaging.service" class="org.red5.server.net.remoting.FlexMessagingService">
		<property name="serviceInvoker" ref="global.serviceInvoker" />
		<!-- add an entry for all possible "destination" attributes of your
			 mx:RemoteObject sources -->
		<property name="endpoints">
			<map>
				<entry key="Red5RemoteObject">
					<!-- object that handles requests sent to this endpoint -->
					<ref bean="web.handler.emeetings" />
				</entry>
			</map>
		</property>
	</bean>
</beans>

需要注意的地方（非常重要，谁能告诉我为什么）：

(1) Application.java的包名最后一级net.xicp.cnfire.red5.remoteobject(红色部分)不能和项目名"emeetings"相同。

(2) remoteobject-web.xml(红色部分)必须和net.xicp.cnfire.red5.remoteobject(红色部分)对应相同。

4.编写客户端Flex代码测试RemoteObject(example.mxml)：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" applicationComplete="init();">
	<mx:Script>
		<![CDATA[
			import mx.rpc.events.ResultEvent;
			import mx.controls.Alert;
			import mx.rpc.events.FaultEvent;
			import mx.rpc.remoting.mxml.RemoteObject;
			private var myHandler: RemoteObject;
			public function init(): void {
				
				myHandler = new RemoteObject("Red5RemoteObject"); 
				myHandler.showBusyCursor = true;
				
				//这里要写上端口8080，因为我的80端口被别的程序占用了
				myHandler.endpoint = "http://localhost:8080/emeetings/gateway";
				myHandler.addEventListener("fault", onError);
				myHandler.getMsg.addEventListener("result", onEchoDetails);
				myHandler.getMsg();
				
			}
			
			private function onError(event: FaultEvent): void {
				Alert.show("Error: " + event.fault.faultString);
			}
			
			protected function onEchoDetails(event: ResultEvent): void {
				Alert.show(event.result.toString());
			}
		]]>
	</mx:Script>
</mx:Application>

5.在浏览器地址栏输入：http://localhost:8080/emeetings/example.html 正确的话在弹出对话框里应该是“this msg from server” 。如果为“Error: Send failed”则可能是端口错误，查看8080端口是否被占用。或者为 remoteobject-web.xml(红色部分)与项目名称"emeetings"相同了；如果为“Error: Endpoint Red5RemoteObject doesn't exist.”则可能是remoteobject-web.xml(红色部分)和net.xicp.cnfire.red5.remoteobject(红色部分)与项目名"emeetings"相同。注意看上面一步的需要注意的地方（非常重要）

 

下面再演示配置多个RemoteObject，增加一个RemoteObject类(RemoteObjectDemo.java)：

package net.xicp.cnfire.red5.remoteobject;

public class RemoteObjectDemo {
	public String getMsg() {
		return "这是第二个RemoteObject调用，通过RemoteObject调用普通类的例子！";
	}
}

修改remoteobject-web.xml：

<?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="web.context.emeetings" class="org.red5.server.Context">
		<property name="scopeResolver" ref="red5.scopeResolver" />
		<property name="clientRegistry" ref="global.clientRegistry" />
		<property name="serviceInvoker" ref="global.serviceInvoker" />
		<property name="mappingStrategy" ref="global.mappingStrategy" />
	</bean>
	
	<bean id="web.scope.emeetings" class="org.red5.server.WebScope" init-method="register">
		<property name="server" ref="red5.server" />
		<property name="parent" ref="global.scope" />
		<property name="context" ref="web.context.emeetings" />
		<property name="handler" ref="web.handler.emeetings" />
		<property name="contextPath" value="/emeetings" />
		<property name="virtualHosts" value="*,localhost, localhost:8080, 127.0.0.1:8080" />
	</bean>

	<bean id="web.handler.emeetings" class="net.xicp.cnfire.red5.remoteobject.Application"/>
	<bean id="my.handler.remoteobject" class="net.xicp.cnfire.red5.remoteobject.RemoteObjectDemo"/>
	<!-- enable support for mx:RemoteObject requests -->
	<bean id="flexMessaging.service" class="org.red5.server.net.remoting.FlexMessagingService">
		<property name="serviceInvoker" ref="global.serviceInvoker" />
		<!-- add an entry for all possible "destination" attributes of your
			 mx:RemoteObject sources -->
		<property name="endpoints">
			<map>
				<entry key="Red5RemoteObject">
					<!-- object that handles requests sent to this endpoint -->
					<ref bean="web.handler.emeetings" />
				</entry>
				<entry key="RODemo">
					<!-- object that handles requests sent to this endpoint -->
					<ref bean="my.handler.remoteobject" />
				</entry>
			</map>
		</property>
	</bean>
</beans>

可以看到增加了一个bean：<bean id="my.handler.remoteobject" class="net.xicp.cnfire.red5.remoteobject.RemoteObjectDemo"/>
和一个entry：

<entry key="RODemo">
          <!-- object that handles requests sent to this endpoint -->
          <ref bean="my.handler.remoteobject" />
</entry>
最后修改Flex代码(example.mxml)：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" applicationComplete="init();">
	<mx:Script>
		<![CDATA[
			import mx.rpc.events.ResultEvent;
			import mx.controls.Alert;
			import mx.rpc.events.FaultEvent;
			import mx.rpc.remoting.mxml.RemoteObject;
			
			private var myHandler: RemoteObject;
			private var myHandler1:RemoteObject;
			
			public function init(): void {
				
				myHandler = new RemoteObject("Red5RemoteObject"); 
				myHandler.showBusyCursor = true;
				
				myHandler1 = new RemoteObject("RODemo"); 
				myHandler1.showBusyCursor = true;
				
				//这里要写上端口8080，因为我的80端口被别的程序占用了  
				myHandler.endpoint = "http://localhost:8080/emeetings/gateway";
				myHandler.addEventListener("fault", onError);
				myHandler.getMsg.addEventListener("result", onEchoDetails);
				myHandler.getMsg();
				
				myHandler1.endpoint = "http://localhost:8080/emeetings/gateway";
				myHandler1.addEventListener("fault", onError);
				myHandler1.getMsg.addEventListener("result", onEchoDetails);
				myHandler1.getMsg();
			}
			
			private function onError(event: FaultEvent): void {
				Alert.show("Error: " + event.fault.faultString);
			}
			
			protected function onEchoDetails(event: ResultEvent): void {
				Alert.show(event.result.toString());
			}
		]]>
	</mx:Script>
</mx:Application>

打开浏览器在地址栏输入http://localhost:8080/emeetings/example.html 查看弹出对话框，可以看到两个弹出对话框，内容分别为"这是第二个RemoteObject调用，通过RemoteObject调用普通类的例子！"和"this msg from server"。

    

至此，原来基于LCDS的Flex应用都可以平滑的过渡到Red5了(因为我仅仅用到了LCDS的Remote服务--RemoteObject，其他的DataManagement服务、Message服务都还没用到~~，也不知道RED5支持不支持这些，也查不到相关信息，知道的告诉我一下啊~~)，后面将介绍从FMS过渡到Red5的一些内容，首当其冲的就是RemoteSharedObject了。