Flex 开发入门
本文介绍 Flex 开发的基础知识：包括如何搭建开发环境，如何调试，以及如何建立和部署简单的 Flex 项目。通过本文的学习，可以为您将来深入地学习 Flex 打下良好的基础。
Flex 作为富 Internet 应用（RIA）时代的新技术代表，自从 2007 年 Adobe 公司将其开源以来，Flex 就以前所未有的速度在成长。很多公司，包括 IBM 都纷纷加入了 Flex 开发的阵营当中。很多开发人员也按捺不住 Flex 的“诱惑”而准备从事 Flex 开发。本文主要讲述 Flex 开发的基础知识，主要是关于开发环境的搭建，以及介绍简单的 Flex 项目创建、编码、调试以及部署的过程和 Flex 编程的基本知识。通过本文的学习，您将会学习如何搭建 Flex 基本的开发环境以及开发、调试和部署方面的基础知识。为您以后深入系统的学习 Flex 打下良好的基础。
要学习本文，您需要有一定的 Web 编程经验和 Eclipse FireFox 使用经验。
本文所有示例均在 Windows XP SP3 系统中测试完成。您需要一台能流畅运行 Windows XP 系统的机器，除此之外您还需要一些工具才能试用本文中的代码。所有这些工具都可以免费下载（参见 参考资源）：
- Java SDK 1.5 或更高版本
- Tomcat 6.0 或更高版本
- Eclipse 3.3 或更高版本
- Flex Builder 3.0 或更高版本
- FireFox2.0 或更高版本
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接下来我们便迫不及待的开始吧！首先搭建我们的开发环境，为了减少因为环境不一致而引起的问题，建议读者使用与本文相同的软件版本：
- 下载 并安装 JDK( 本文使用版本为 Sun JDK 6) ；
- 下载 并解压 Eclipse( 本文使用版本为 Eclipse Ganymede J2EE 版本，含 WTP 插件 );
- 下载 并安装 Flex Builder Eclipse 插件版 ( 本文使用的 Flex Builder 版本为 3.0.1);
- 下载 并安装 Tomcat( 本文使用版本为 Tomcat6.0.18);
- 下载 并安装 FireFox( 由于 Flex3.0 和一些插件的兼容性问题，本文使用 FireFox2.0.0.17)
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大家知道 Flex 代码编译后是一个 SWF 文件，运行在 Flash Player 中，要想看到 SWF 文件在运行时输出的一些调试信息是比较困难的。所以在安装好基本的软件之后，我们要安装一些便于我们调试 Flex 的 FireFox 插件：
下载 并安装 debug 版本的 FireFox Flash Player 插件 ( 本文使用的版本为 Flash Player10)
打开 FireFox，到 FireFox 的 扩展组件站点 上搜索并安装 HttpFox，FlashTracer，Cache Status 三个插件，如图 1 所示。
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在安装了 Debug 版本的 Flash Player 之后，Flash Tracer 能显示您在程序中用 trace() 语句输出的调试信息，HttpFox 插件不仅能查看 HTTP 通信的过程和数据，还能看到哪些内容是从 Cache 里面读取的。另外，Cache Status 插件可以让我们方便的管理缓存。在 Flex 开发过程中，往往需要先清除掉缓存中的内容，才能看到新改动的效果。
接下来我们打开 Flex Builder, 在菜单Window>Preferences>Server>Runtime Environment中设置我们的 Tomcat6 以及在菜单Window>Preferences>General>Web Browser中设置浏览器为外部浏览器 FireFox，如图 2 和图 3 所示：
到此为止，我们的开发环境算是彻底搭建完毕，可以看出这个过程并不算是特别简单。别急，先苦后甜，小憩一下，让我们来享受一下 Flex 开发带来的乐趣吧！
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打开 Flex Builder, 如图 4 所示，新建一个 Flex 项目：
在图 5 所示设置页面中，我们选择项目类型是 Web application，关于 AIR 类型应用的基础知识可参考 developerWorks 上的另一篇文章《使用 Adobe AIR 和 Dojo 开发基于 Ajax 的 Mashup 应用》。 Application server type 我们以 J2EE 为例，并且不要钩选 Use remote object access service, 关于这些高级内容，我们将在后续的文章中陆续讨论。最后我们使用 Eclipse Ganymede J2EE 版本内置的 WTP(Web Tools Platform) 来创建一个后端使用 Java 前端使用 Flex 的 RIA 项目。在默认设置下，src 是 Java 代码的源代码文件夹。
在后续的设置页面中，我们配置项目运行时的 J2EE server 为我们在安装配置开发环境部分中配置的 Tomcat6 如图 6 所示：
点击 Next，在下一个页面中一切都按照默认设置即可。如图 7 所示，Main source folder 是设置默认的 flex 代码 ( 包括 mxml 和 Action script) 的源文件夹，Main application file 是项目默认的主应用。 Out folder URL 是项目运行在我们配置的 Tomcat 上时的 URL.
一切完成之后，我们来看看项目的组成结构，如图 8 所示：flex_src 中是默认的 flex 源码位置，flex_libs 则是存放 flex 其他第三方包的默认路径。类似于 web 应用的 lib 文件夹。 src 是 java 代码位置。 WebContent 文件夹的结构和普通由 WTP 建立的 Web Project 的结构完全相同。在默认的输出路径 bin-debug 文件夹中，我们可以看出 Flex builder 自动生成的 FlexSample.mxml 文件已经被自动编译成 FlexSample.swf 文件。
接下来，我们在新创建的项目上增加一点内容并让它运行起来：双击 FlexSample.mxml, 在其中添加一个最基本的 Flex 组件 :Label, 并且在该应用初始化的时候调用 init() 方法。我们在 init() 方法中用 trace() 语句输出调试信息。 代码如下清单 1 所示：
<?xml version="1.0" encoding="utf-8"?>
<mx:Application
xmlns:mx="http://www.adobe.com/2006/mxml"
layout="absolute"
initialize="init()">
<mx:Script>
<![CDATA[
private function init():void
{
var i:int = 0;
i++;
trace("i="+i);
}
]]>
</mx:Script>
<mx:Label text="Hello World!" />
</mx:Application>
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现在，终于到了让我们的项目运行的时候了 ! 右键点击项目 ->Run As->Run On Server 如图 9 所示：接下来的几个页面选择默认即可，这时大家我们可以看到项目会被部署到我们配置的 Tomcat6 上去。并且 Flex Builder 会自动打开一个我们刚才配置的外部 FireFox 窗口。
但可能令您遗憾的是 Flex Builder 自动打开的 FireFox 窗口打开的 URL: http://localhost:8080/FlexSample/ 却什么也没有。别着急，还剩下最后一步：
如图 10 所示：右键点击我们要运行的 FlexSample.mxml > Run As > Flex Application
如果不出意外的话，您应该会看到下面的界面，Flash Tracer 插件输出了我们用 trace() 语句输出的 debug 信息，标签的 Hello World ！也被显示到了界面上。同样，打开 FireFox 的 HttpFox 插件，我们也可以看到在运行时 FlexSample.swf 被载入。
如果我们希望像调试 Java 代码那样，在运行时观察变量的值怎么办呢？首先我们像在 Java 代码中设置断点一样给我们的 Action Script 代码增加断点。如图 12 所示：
然后选择我们的 FlexSample.mxml 右键选择调试运行。如图 13 所示：
然后我们随提示切换到 Flex 的调试视图，就会看到我们可以像 Java 调试模式那样轻松的调试 Flex 代码。如图 14 所示：
利用 WTP，我们可以将项目 export 成一个标准的 war file. 将导出的 war 文件放到 Tomcat 的 webapps 目录或者其他 web 服务器的相应目录下就可以当作一个标准的 web 应用来部署运行。
到此为止，我们应该庆祝一下我们已经迈入了 Flex 的大门了！我们已经编译出了我们自己的 swf 文件，并且运行在服务器上了。熟悉了这个开发过程之后，让我们乘胜前进，结合一个小例子学习一下 Flex 的编程基础知识吧！
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在上面 Hello World 的例子中我们可以看出，就像在 HTML 中嵌入 JavaScript 那样，我们可以在 mxml 里面嵌入 Action Script 代码来实现业务逻辑。没错！如果您把 Flex 中 mxml 和 Action Script 的关系理解为 Html 和 JavaScript 的关系，您会忽然发现您对 Flex 变的如此熟悉！
Action Script 语言是面向对象的脚本语言，它连编写方式都和 JavaScript 非常的相似。除了可以嵌套在 mxml 里面之外，它还可以像 JavaScript 写在单独的 .js 文件里面那样写在单独的 .as 文件里面，然后在 mxml 里面引入它。
下面我们新建一个 Action Script 的类 J2eeServer.as 如清单 2 所示：
package com.ibm.flex
{
import flash.events.EventDispatcher;
import mx.rpc.AsyncToken;
import mx.rpc.events.FaultEvent;
import mx.rpc.events.ResultEvent;
import mx.rpc.http.HTTPService;
public class J2eeServer extends EventDispatcher
{
public function J2eeServer()
{
}
public function sendRequest(locale:String):void
{
var httpObject:HTTPService = new HTTPService();
httpObject.resultFormat = "text";
httpObject.url =
"http://localhost:8080/FlexSample/SampleServlet?locale="+locale;
var responder:mx.rpc.Responder = new mx.rpc.Responder(onSuccess, onFault);
var call:AsyncToken = httpObject.send();
call.addResponder(responder);
}
private function onSuccess(event:ResultEvent):void
{
this.dispatchEvent(event);
}
private function onFault(event:FaultEvent):void
{
trace("communication failed!");
this.dispatchEvent(event);
}
}
}
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在这个类定义里面，熟悉 Java 的开发人员可以看出其编码规范和 Java 非常类似。在其中我们定义了一个 sendRequest() 方法， 使用 HTTPService 对象发起一个 http 的 get 请求 , 并且对于不同的返回结果我们定义了 onSuccess() 和 onFault() 两个方法去处理。在这两个结果处理方法中，我们将事件 dispatch 出去。
在 J2eeServer.as 中，我们通过 Action Script 发出 http 请求，现在我们定义一个服务器端的 servlet 来处理该请求。如清单 3 所示：
package com.ibm.sample;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class SampleServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public SampleServlet() {
super();
}
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
String locale = request.getParameter("locale");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("The locale you selected is " + locale);
}
}
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和普通 web 应用一样配置 web.xml, 如清单 4
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>FlexSample</display-name>
<servlet>
<display-name>SampleServlet</display-name>
<servlet-name>SampleServlet</servlet-name>
<servlet-class>com.ibm.sample.SampleServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>SampleServlet</servlet-name>
<url-pattern>/SampleServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>FlexSample.html</welcome-file>
</welcome-file-list>
</web-app>
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从 J2eeServer.as 中我们依稀可以看出 Flex 事件驱动的影子。的确，Flex 的业务流程大多是靠事件来驱动的。某一个方法结束后，dispatch 出去一个事件。事件的监听者监听到这个事件后就会采取相应的动作来处理事件。如清单 5 所示：我们在 init() 方法中进行了事件绑定，绑定了两个监听方法 successHandler () 和 errorHandler () 到 J2eeServer 上。当 J2eeServer 完成和服务器端 servlet 通信 dispatch 出相应的事件后，两个监听方法便会监听到相应的事件并进行处理。
Flex 的另外一个重要的特点就是支持数据绑定，在另一篇文章《使用 Eclipse 和 JavaFX 开发 Mashup 应用》中 我们曾介绍了 JavaFx 的数据绑定特性，同样 Flex 也支持数据绑定。当数据源被绑定到另外一个对象的某属性上时，数据源的数据如果发生变化，开发人员不需要写额外的代码该对象的属性值就可以相应的变化。如 清单 5 中所示：如果要进行数据绑定，则要先定义一个可绑定的数据源，例如我们在变量 private var serverResponse:String = "" ;的上面设置 [Bindable] 属性，表示其为可绑定变量。然后我们在 resultLable 中使用花括号 {serverResponse} 将变量serverResponse绑定到 resultLable 的 text 属性上。
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"
creationComplete="init()">
<mx:Script>
<![CDATA[
import mx.rpc.events.ResultEvent;
import mx.rpc.events.FaultEvent;
import com.ibm.flex.J2eeServer;
import mx.collections.ArrayCollection;
private var jserver:J2eeServer = new J2eeServer();
//可绑定变量
[Bindable]
private var serverResponse:String = "";
//可绑定变量
[Bindable]
private var locales:ArrayCollection = new ArrayCollection(
[ {label:"en_us", data:"en_us"},
{label:"zh_cn", data:"zh_cn"}]);
private function init():void
{
//事件绑定
jserver.addEventListener(ResultEvent.RESULT, successHandler);
jserver.addEventListener(FaultEvent.FAULT, errorHandler);
}
private function localeComboxChangeHandler(event:Event):void
{
jserver.sendRequest(localeCombox.selectedItem.data);
}
private function successHandler(event:ResultEvent):void
{
serverResponse = event.result.toString();
trace(event.result);
}
private function errorHandler(event:FaultEvent):void
{
serverResponse = event.message.toString();
trace(event.message);
}
]]>
</mx:Script>
<mx:VBox>
<mx:Label text="Select your locale:" />
<mx:ComboBox
id="localeCombox"
width="160"
dataProvider="{locales}"
change="localeComboxChangeHandler(event)"/>
<mx:Label
id="resultLabel"
text="The response from server is: {serverResponse}" />
</mx:VBox>
</mx:Application>
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最终项目的文件结构如图 15 所示：
运行项目，我们可以看到当我们改变下拉框的值的时候，会触发 localeComboxChangeHandler() 函数调用 J2eeServer 的 sendRequest() 方法将选择的 locale 值发送给服务器端的 servlet，并且在结果返回后，将从服务器端得到的 response 显示在 resultLable 上。如图 16 所示：
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Flex 作为 RIA 的新技术，对传统 web 开发技术有继承也有发展。这篇文作为入门文，主要作用是帮助大家掌握 Flex 的开发环境、开发方式、开发调试部署的流程以及 Flex 的基本编程知识。但 Flex 除了国际化、Unit 测试、Ant 编译等传统问题之外，作为新技术 Flex 还有很多不同以往的地方，比如模块开发，RSL(Runtime Shared Libraries), Shared object、和 JavaScript 交互以及它的 MVC 框架 cairngorm，远程调用和消息传递框架 BlazeDS 等。所有这些问题都是值得我们进行后续讨论的。
在本文完成之际，特别感谢 IBM 中国软件开发中心 IM 开发团队我的同事们在工作和学习中给我的巨大帮助！
学习
- “Flex 3 Developer's Guide”：很好的 Flex 基础知识入门材料。
- “Flex Developer Center”：针对具体开发场景的大量示例代码和文章。
- “Flex Ant Tasks”：介绍了如何结合 Ant 工具来编译 Flex。
- “Flex RSL”：对Flex RSL开发的各方面进行详细介绍的官方文档。
- “集成 Flex 与 Ajax 应用程序”（developerWorks，2008 年 7 月）：阅读完本文后，您将能够利用通过 Flash 资源获得的丰富功能。
- “使用 Flex SDK 实现一个 Facebook 相册”（developerWorks，2008 年 12 月）：在本篇教程中，将在 Adobe Flex 中开发一个 Facebook 应用程序，它可以以幻灯片的形式显示用户的 Facebook 相册。
- “Fluint 的官方站点”：Fluint 是 Flex Unit Test 的框架 Flex Unit 的升级版本。
- “Cairngorm 框架的 Adobe 官方站点”：Cairngorm 是 Flex 开发最著名和最成熟的一个 MVC 框架。
- “BlazeDS 框架的开源站点”：BlazeDS 是 Adobe 的一个开源项目。基于服务器的 Java 远程调用（remoting）和 Web 消息传递（messaging）技术，它能够使得后台的 Java 应用程序和运行在浏览器上的 Flex 应用程序或 AIR 应用程序相互通信。
获得产品和技术
- 下载 JRE 或 JDK。
- 下载 Eclipss Ganymede。
- 下载 Flex Builder Eclipse 插件版。
- 下载 Tomcat 6。
- 下载 FireFox 2.0。
- 下载 BDebug 版本的 FireFox Flash Player 插件。
ref:www.ibm.com/developerworks/cn/web/wa-lo-flexdev/#N101DB
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