Flex3 的三种通信

最近看了一些关于flex3的一些学习资料，算是初级的接触了flex3，我介绍flex3的两种通信方式，一个是HTTPService,一个是LCDS（RemoteObject），其中网络说RemoteObject这种方式的通信是最快的， 我并没有去测试，我相信网络资源不会错的，还有一种通信方式是WebService，这个需要指定你操作的方法，我感觉和HTTPService区别也不是很大，也就没写。
那先介绍一下HTTPService方式通信：
后台代码：

public class Flex3 extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		this.doPost(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		response.setCharacterEncoding("UTF-8");
		response.setHeader("Cache-Control","no-cache");
		PrintWriter out = response.getWriter();
		Integer num1 =  Integer.parseInt(request.getParameter("num1"));
		Integer num2 =  Integer.parseInt(request.getParameter("num2"));
		out.print(num1+num2);
		out.close();
	}

}

前台flex的代码：
[quote]

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="this.initDataSource()">

<mx:HTTPService id="flexWebservice1" url="flexServlet" method="POST" resultFormat="text" result="flexServiceHandler(event)">
<mx:request xmlns="">
<num1> {this.num1.text}</num1>
<num2> {this.num2.text}</num2>
</mx:request>
</mx:HTTPService>

<mx:Script>
<![CDATA[
import mx.rpc.events.ResultEvent;
import mx.controls.Alert;
import mx.collections.ArrayCollection ;

[Bindable]
private var dataSource:Array = new Array();

private function initDataSource():void
{
this.dataSource.push("+");
this.dataSource.push("-");
this.dataSource.push("*");
this.dataSource.push("/");
this.list.dataProvider = dataSource;
}
private function requestServer():void
{
//Alert.show("nihao","flex第一次测试");
this.flexWebservice1.send();
}
private function flexServiceHandler(event:ResultEvent):void
{
var returnData:String = String(event.result);
this.result.text = event.result.toString();
}
]]>
</mx:Script>

<mx:VBox>
<mx:HBox>
<mx:TextInput id="num1" name="num1" width="100">
</mx:TextInput>
<mx:Label text="+" width="100">
</mx:Label>

<mx:List x="126" y="-2" width="59" height="46" id="list" dropEnabled="true" allowMultipleSelection="false" >

</mx:List>

<mx:TextInput id="num2" name="num2" width="100">
</mx:TextInput>
<mx:Label text="=" width="100">
</mx:Label>
<mx:TextInput id="result" name="result" width="100">
</mx:TextInput>
<mx:Button label="submit" click="this.requestServer()" width="100">
</mx:Button>
</mx:HBox>
</mx:VBox>

</mx:Application>
[/quote]
web.xml的配置我就不写了，我用到 是servlet来写的这么一个小程序，只是简单的介绍一下flex的通信方式
--------------------------------------下面谈谈lcds远程对象这种通信 方式，因为lcds是免费的，所以介绍 这个，还有一个是 blanzed ，那个是收费的
前台代码

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">

	<mx:Script>
		<![CDATA[
			import mx.collections.ArrayCollection;
			import mx.rpc.events.ResultEvent;
			import mx.controls.Alert;
			import com.test.model.Person;

			private function buttonClick():void
			{
				var value:String = this.username.text;

				this.testService.sayHello(value);
			}

			private function clickHandler(event:ResultEvent):void
			{
				var str:String = String(event.result);

				Alert.show(str);
			}
		]]>
	</mx:Script>


	<mx:RemoteObject id="testService" destination="testService">
		<mx:method name="sayHello" result="clickHandler(event);" />
	</mx:RemoteObject>

	<mx:HBox>
		<mx:TextInput id="username" width="120"/>
		<mx:Button label="click me" width="120" click="buttonClick();"/>
	</mx:HBox>


</mx:Application>

后台代码：

public class TestService
{
	public String sayHello(String name)
	{
		System.out.println(name);

		return "Hello: " + name;
	}
}

这里有一个最重要的配置文件，就是 web-info 目录先 felx下的remoting-config.xml这个文件
我的配置是：

<?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>

    <destination id="testService">
    	<properties>
    		<source>com.test.service.TestService</source>
    	</properties>
    </destination>

</service>

如何安装lcds 我在另外一讲中在具体的说