Flex与服务器交互（使用RemoteObject+BlazeDS+TomCat同Java交互及开发环境配置）

由于Flex只是一种客户端技术其本身并不能直接同数据库交互，在实际的应用开发过程中Flex提供了如URLRequest、HTTPService、RemoteObject、WebService等类以实现同服务器的通讯和数据交互，下面做一些介绍和实例解析:
   本示例用到的开发工具和组件：jdk1.6、eclipse3.0、  FlexBuilder3.0、  blazeds-turnkey-3.3.0.9885(已包含Tomcat)
   1、安装JDK至指定目录下如：C:/Program Files/Java/jdk1.6.0_16
   2、解压blazeds-turnkey-3.3.0.9885.zip 将tomcat目录拷贝至：D:/Program Files/tomcat
   3、配置或加入我的电脑环境变量：[c-sharp] view plaincopyprint?

JAVA_HOME       C:/Program Files/Java/jdk1.6.0_16  CATALINA_BASE   D:/Program Files/tomcat CATALINE_HOME   D:/Program Files/tomcat  CLASSPATH       %JAVA_HOME%/lib;%CATALINA_HOME%/lib/servlet-api.jar Path            %JAVA_HOME%/bin;%JAVA_HOME%/lib; 

JAVA_HOME C:/Program Files/Java/jdk1.6.0_16CATALINA_BASE D:/Program Files/tomcatCATALINE_HOME D:/Program Files/tomcatCLASSPATH %JAVA_HOME%/lib;%CATALINA_HOME%/lib/servlet-api.jarPath %JAVA_HOME%/bin;%JAVA_HOME%/lib;
   4、查看Tomcat服务器配置信息：
      查看D:/Program Files/tomcat/conf/server.xml文件
      找到 <Connector port="8400" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="9400" />
      配置的端口信息为“8400”
   5、手动方式启动TomCat检查是否配置成功(当然你也可以在Eclipse中安装TomCat插件控制Tomcat)：
      启动命令行“cd D:/Program Files/tomcat/bin”定位至Tomcat Bin目录
      运行“startup.bat”启动TomCat看到如下（启动成功）：

      浏览器中输入：“http://localhost:8400/”如下（恭喜JAVA环境+BlazeDS+Tomcat配置成功）：

   6、建立开发文件夹，拷贝BlazeDS配置文件和用到的配置文件及类库“WEB-INF”至站点目录：
      找到blazeds.war个改后缀为RAR解压找到“WEB-INF”文件夹拷贝至"WebSite"下目录结构如：

      这样做的目的是将JAVA项目同Flex项目Web站点目录分开互不干扰（使用eclipse的Flex开发插件有时会报莫名的错误，Flex开发还是建议用FlexBuilder）
   7、在Eclipse中新建java项目并将编译路径链接至“../WebSite/WEB-INF/classes”目录下如图：

   8、发布WebSite至TomCat：
      在“D:/Program Files/tomcat/conf/server.xml”文件<Host>节点中新增如下<Context>节点重启TomCat（执行第5步骤运行“shutdown.bat”再运行“startup.bat”）

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<Host name="localhost" appBase="webapps"            unpackWARs="true"autoDeploy="true"            xmlValidation="false" xmlNamespaceAware="false"> <Context path="/WebSite"docBase="E:/学习/BlazeDs/WebSite"debug="0" reloadable="true"crossContext="true" /> </Host> 

<Host name="localhost" appBase="webapps"unpackWARs="true" autoDeploy="true"xmlValidation="false" xmlNamespaceAware="false"><Context path="/WebSite" docBase="E:/学习/BlazeDs/WebSite" debug="0" reloadable="true" crossContext="true" /></Host>

   9、新建FLEX 服务器为J2EE的“myBlazeDSFlex”项目至"E:/学习/BlazeDs/Flex"目录

   10、配置服务器及Flex输出目录至“webSite/flex"下,并“Validate Configuration”通过(如图)：

   11、你也可以手动设置Felx项目属性(如图)来配置J2EE服务器:

   12、在eclipse中编写完成Java类及方法 并编译：
       UserBean类：
 

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package myBlazeDS;  publicclass UserBean {    private String _name;   private int _age;   private String _address;   public UserBean(String name,int age,String address)   {     this._name = name;     this._age = age;     this._address = address;   }        publicvoid setName(String name)    {    this._name = name;    }    public String getName()    {     return this._name;    }       public void setAge(int age)   {     this._age = age;    }    public int getAge()   {     return this._age;   }        publicvoid setAddress(String address)    {     this._address = address;    }    public String getAddress()    {     return this._address;   }  } 

package myBlazeDS;public class UserBean {private String _name;private int _age;private String _address;public UserBean(String name,int age,String address){this._name = name;this._age = age;this._address = address;}public void setName(String name){this._name = name;}public String getName(){return this._name;}public void setAge(int age){this._age = age;}public int getAge(){return this._age;}public void setAddress(String address){this._address = address;}public String getAddress(){return this._address;}}

外部接口类BlazeDSService:
 

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package myBlazeDS;    publicclass BlazeDSService {    public String GetBlazeService(String user)   {     return user +":欢迎使用Java　BlazeDS同Flex交互";   }    public UserBean GetUserInfo(String name,int age,String address)   {     return new UserBean("User:" + name, age,address +" China");    }  } 

package myBlazeDS;public class BlazeDSService {public String GetBlazeService(String user){return user +":欢迎使用Java　BlazeDS同Flex交互";}public UserBean GetUserInfo(String name,int age,String address){return new UserBean("User:" + name, age,address + " China");}}

　　13、配置“E:/学习/BlazeDs/WebSite/WEB-INF/flex/remoting-config.xml”增加（如图）：

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<destination id="FirstBlazeService"> <properties>  <source>   myBlazeDS.BlazeDSService  </source> <scope>application</scope> </properties>  </destination> 

<destination><properties><source>myBlazeDS.BlazeDSService</source><scope>application</scope></properties></destination>

    14、在Flex引入RemoteObject 指定destination属性加入调用方法<mx:method>节点如：

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<mx:RemoteObject id="myJavaService"destination="FirstBlazeService"showBusyCursor="true"> <mx:method name="GetBlazeService"fault="onBlazeDSFalut(event)"/>  <mx:methodname="GetUserInfo" result="getUserBean(event)"fault="onBlazeDSFalut(event)"/>  </mx:RemoteObject> 

<mx:RemoteObject destination="FirstBlazeService" showBusyCursor="true"><mx:method name="GetBlazeService" fault="onBlazeDSFalut(event)" /><mx:method name="GetUserInfo" result="getUserBean(event)" fault="onBlazeDSFalut(event)" /></mx:RemoteObject>

　　15、完整体Flex页面代码：
　　 

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<?xml version="1.0"encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"layout="absolute"> <mx:RemoteObject id="myJavaService"destination="FirstBlazeService"showBusyCursor="true">   <mx:method name="GetBlazeService"fault="onBlazeDSFalut(event)"/>    <mx:methodname="GetUserInfo" result="getUserBean(event)"fault="onBlazeDSFalut(event)"/>  </mx:RemoteObject> <mx:Canvas width="653"height="190" x="10"backgroundColor="#297E8D" fontSize="15">    <mx:Script>     <!--[CDATA[     import mx.rpc.events.FaultEvent;      import mx.rpc.events.ResultEvent;     import mx.controls.Alert;      import mx.core.UIComponent;     import mx.core.BitmapAsset;      import mx.core.ByteArrayAsset;     private function onCallJava():void      {       myJavaService.GetBlazeService(nameInput.text);     }      private function onCallBean():void      {      myJavaService.GetUserInfo(txtName.text,int(txtAge.text),txtAddress.text);             }      private function getUserBean(e:ResultEvent):void     {       var o:*=e.result as Object;      vtxtName.text = o.name;       vtxtAge.text = o.age;      vtxtAddress.text = o.address;     }       private function onBlazeDSFalut(e:FaultEvent):void     {       Alert.show(e.message.toString());      }     ]]-->    </mx:Script>   <mx:TextInput id="nameInput" x="108" y="18"width="145"/>    <mx:Button label="Call Java"click="onCallJava();" x="274" y="18"fillAlphas="[1.0, 1.0]"/>   <mx:TextArea text="{myJavaService.GetBlazeService.lastResult}" x="397" height="34"width="246" y="19"/>   <mx:Label x="10"y="61" width="632"height="2"/>    <mx:Label x="10"y="80" text="UserName:"/>   <mx:Label x="10"y="117" text="UserAge:"/>   <mx:Label x="10"y="150" text="Address:"/>   <mx:TextInput x="108"y="78" id="txtName"width="146"/>    <mx:TextInput x="107"y="115" id="txtAge"width="147"/>    <mx:TextInput x="107"y="148" id="txtAddress"width="147"/>    <mx:Button x="272"y="112" label="Call Bean"id="btnCallBean" click="onCallBean();"/>   <mx:Text x="397"y="80" width="246"id="vtxtName"/>   <mx:Text x="397"y="117" width="246"id="vtxtAge"/>    <mx:Text x="397"y="150" width="246"id="vtxtAddress"/>   </mx:Canvas>  </mx:Application>  　　 

<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"><mx:RemoteObject destination="FirstBlazeService" showBusyCursor="true"><mx:method name="GetBlazeService" fault="onBlazeDSFalut(event)" /><mx:method name="GetUserInfo" result="getUserBean(event)" fault="onBlazeDSFalut(event)" /></mx:RemoteObject><mx:Canvas width="653" height="190" x="10" backgroundColor="#297E8D" fontSize="15"><mx:Script><!--[CDATA[import mx.rpc.events.FaultEvent;import mx.rpc.events.ResultEvent;import mx.controls.Alert;import mx.core.UIComponent;import mx.core.BitmapAsset;import mx.core.ByteArrayAsset;private function onCallJava():void{myJavaService.GetBlazeService(nameInput.text);}private function onCallBean():void{myJavaService.GetUserInfo(txtName.text,int(txtAge.text),txtAddress.text);}private function getUserBean(e:ResultEvent):void{var o:*=e.result as Object;vtxtName.text = o.name;vtxtAge.text = o.age;vtxtAddress.text = o.address;}private function onBlazeDSFalut(e:FaultEvent):void{Alert.show(e.message.toString());}]]--></mx:Script><mx:TextInput x="108" y="18" width="145"/><mx:Button label="Call Java" click="onCallJava();" x="274" y="18" fillAlphas="[1.0, 1.0]"/><mx:TextArea text="{myJavaService.GetBlazeService.lastResult}" x="397" height="34" width="246" y="19"/><mx:Label x="10" y="61" width="632" height="2"/><mx:Label x="10" y="80" text="UserName:"/><mx:Label x="10" y="117" text="UserAge:"/><mx:Label x="10" y="150" text="Address:"/><mx:TextInput x="108" y="78" width="146"/><mx:TextInput x="107" y="115" width="147"/><mx:TextInput x="107" y="148" width="147"/><mx:Button x="272" y="112" label="Call Bean" click="onCallBean();"/><mx:Text x="397" y="80" width="246"/><mx:Text x="397" y="117" width="246"/><mx:Text x="397" y="150" width="246"/></mx:Canvas></mx:Application>

      16、DEMO完成后目录结构如图：

　　17、DEMO功能完成最终效果如图：源码下载：
　　

　　flex还可以通过如XMLSocket　FMS　二进制套接字等同服务器交互，就不再赘述了本系列课程到此告一段落!