Flex数据交互之Remoting
一 前言
Flex数据交互常用的有三种方式:WebService、HttpService以及Remoting。
WebService方式已在这篇文章中给出,这篇文章主要讲解以Remoting方式进行数据交互,Remoting是基于AMF的数据交互,速度及性能均较WebService好,是公认最有效率的方法。
二 FluorineFX
FluorineFx是一个开源库,提供了一种在.NET Framework下对Flex/Flash的远程调用过程。FluorineFx官网地址在这,FluorineFx可以在这下载。
下载安装后,会在vs2008中自动增加两处模板:FluorineFx ServicesLibrary与FluorineFx ASP.NET Web Site。
接下来演示如何利用FluorineFx进行Flex与ASP.NET数据交互。
三 ASP.NET服务器开发
(1)新建FluorineFx ServicesLibrary类库,如下图:
(2)在刚才建立的解决方案FlexRemotingDemo中,添加FluorineFx ASP.NET Web Site网站,如下图:
该网站会自动引入FlexRemotingDemo.dll:
在类库FlexRemotingDemo的Sample.cs文件中可以添加自己的函数:
/// <summary>
/// 获得监测站信息(14个监测站)
/// </summary>
/// <returns></returns>
public string getStationInfo()
{
string json = "";
DataTable dt = new DataTable();
dt = helper.GetStationInfo();
if (dt != null)
{
json = ConverTableToJSON(dt);
} return json;
}
将网站发布到IIS下:运行即可看到结果:
(3)修改WEB-INF\flex下的services-config.xml配置文件:
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<channels> <channel-definition id= "my-amf" class = "mx.messaging.channels.AMFChannel" >
<endpoint uri= "<strong><span style=" color: #ff0000; ">http://localhost/FlexRemotingDemo/Gateway.aspx</span></strong>" class = "flex.messaging.endpoints.AMFEndpoint" />
<properties>
<!-- <legacy-collection> true </legacy-collection> -->
</properties>
</channel-definition>
<!--
<channel-definition id= "my-rtmp" class = "mx.messaging.channels.RTMPChannel" >
<properties>
<idle-timeout-minutes>20</idle-timeout-minutes>
</properties>
</channel-definition>
-->
</channels>
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四 Flex客户端开发
(1)新建Flex项目:
(2)配置Flex项目FlexRemotingDemo:
(3)编写程序代码:
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">
<fx:Declarations>
<mx:RemoteObject id="RO" destination="fluorine" source="ServiceLibraryDemo.Sample">
<mx:method name="getStationInfo" result="onResult(event)"/>
</mx:RemoteObject>
</fx:Declarations> <fx:Script>
<![CDATA[
import mx.events.FlexEvent;
import mx.rpc.AbstractOperation;
import mx.rpc.events.ResultEvent; protected function btn1_clickHandler(event:MouseEvent):void
{
RO.getStationInfo();
} public function onResult(evt:ResultEvent):void{
txt1.text=evt.result.toString();
} ]]>
</fx:Script> <s:Button id="btn1" label="获得14个监测站信息" x="630" y="50" click="btn1_clickHandler(event)"/>
<s:TextArea id="txt1" x="20" y="40" width="600" />
</s:Application>
运行结果如下:
五 源码下载
源码在这下载。
2013年12月12日修改
源码下载。
六 RemoteObject的封装
如上面,用起来相对比较麻烦,封装RemoteObject以方便使用,这篇文章给出了相应的封装方法,我略作改动以适用本程序。
(1)CYMRemoteObject.cs
package components
{
/**
* @author chenyuming
*/ import mx.controls.Alert;
import mx.rpc.AbstractOperation;
import mx.rpc.AsyncToken;
import mx.rpc.CallResponder;
import mx.rpc.Responder;
import mx.rpc.events.FaultEvent;
import mx.rpc.events.ResultEvent;
import mx.rpc.remoting.mxml.RemoteObject; public class CYMRemoteObject extends RemoteObject
{
public static const DEFAULT_DESTINATION:String = "fluorine";
public static const DEFAULT_SOURCE:String = ""; public function CYMRemoteObject(source:String,destination:String = DEFAULT_DESTINATION)
{
this.source = source;
super(destination);
} public function call(methodName:String, callback:Function, ...args):void
{
var method:AbstractOperation = this.getOperation(methodName); //为了方便起见,如果有多个参数的话就把参数包成一个Array,在J2EE端使用Object[]来获取参数
method.arguments = args;
var call:AsyncToken = method.send();
call.userDefinedCallback = callback;
call.addResponder(new Responder(resultCallback, faultCallback));
} public function resultCallback(event:ResultEvent):void
{
var callback:Function = event.token.userDefinedCallback as Function; if (callback != null)
{
var result:CYMRemoteObjectResult = new CYMRemoteObjectResult();
result.error = false;
result.result = event.result;
callback(result);
}
} public function faultCallback(event:FaultEvent):void
{
var callback:Function = event.token.userDefinedCallback as Function;
if (callback != null)
{
var result:CYMRemoteObjectResult = new CYMRemoteObjectResult();
result.error = true;
result.errorMessage = event.fault.toString();
callback(result);
}
}
}
}
CYMRemoteObjectResult.cs
package components
{
/**
* @author chenyuming
*/
public class CYMRemoteObjectResult
{
public function CYMRemoteObjectResult()
{ } public var error:Boolean = false;
public var errorMessage:String = null;
public var result:Object = null;
}
}
(2)引用方式
protected function btn1_clickHandler(event:MouseEvent):void
{
var ro:CYMRemoteObject = new CYMRemoteObject("ServiceLibraryDemo.Sample", "fluorine");
ro.call("getStationInfo",onResult3); //RO.getStationInfo();
} public function onResult3(evt:CYMRemoteObjectResult):void
{
if(evt.error)
{
Alert.show(evt.errorMessage);
}
else
{
txt1.text=evt.result.toString();
} }
七 返回DataTable类型
上面利用getStationInfo返回的是json类型,有时服务器端更喜欢直接返回DataTable类型以便于直接绑定Flex中形如DataGrid的容器,下面演示数据交互类型为DataTable:
(1)服务器端:Sample.cs中增加函数getStationInfo2
/// <summary>
/// 获得监测站信息(14个监测站)
/// </summary>
/// <returns></returns>
public DataTable getStationInfo2()
{
DataTable dt = new DataTable();
dt = helper.GetStationInfo(); return dt;
}
(2)客户端Flex:FlexRemotingDemo.mxml中添加DataGrid容器
<s:Button id="btn2" label="获得14个监测站信息" x="630" y="199" click="btn2_clickHandler(event)"/>
<s:DataGrid id="dg" x="20" y="199" width="600" height="401" dataProvider="{arrColl}"
requestedRowCount="14" textAlign="center">
<s:columns>
<s:ArrayList>
<s:GridColumn width="{0.21 * this.dg.width}" dataField="jcd_name" headerText="监测点名称"></s:GridColumn>
<s:GridColumn width="{0.13 * this.dg.width}" dataField="ssly" headerText="所属流域"></s:GridColumn>
<s:GridColumn width="{0.30 * this.dg.width}" dataField="zyzbytr" headerText="主要植被与土壤"></s:GridColumn>
<s:GridColumn width="{0.10 * this.dg.width}" dataField="xqsl" headerText="小区数量"></s:GridColumn>
<s:GridColumn width="{0.13 * this.dg.width}" dataField="fjswylz" headerText="附近水文雨量站"></s:GridColumn>
<s:GridColumn width="{0.13 * this.dg.width}" dataField="jgsj" headerText="竣工时间"></s:GridColumn>
</s:ArrayList>
</s:columns>
</s:DataGrid>
利用封装好的RemoteObejct对象CYMRemoteObject来绑定DataGrid:
[Bindable]
private var arrColl:ArrayCollection = new ArrayCollection(); protected function btn2_clickHandler(event:MouseEvent):void
{
var ro:CYMRemoteObject = new CYMRemoteObject("ServiceLibraryDemo.Sample","fluorine");
ro.call("getStationInfo2",onResult2);
} public function onResult2(evt:CYMRemoteObjectResult):void
{
if(evt.error)
{
Alert.show(evt.errorMessage);
}
else
{
arrColl.removeAll(); // 获取列名
var columnName:Array = evt.result.serverInfo.columnNames as Array; //获取数据
var columnData:Array = evt.result.serverInfo.initialData as Array; //列数组
var columns:Array=new Array(); for(var rowIndex:int = 0; rowIndex < columnData.length; rowIndex++)
{
var obj:Object = new Object();
for(var colIndex:int = 0; colIndex < columnName.length; colIndex++)
{
var key:String = columnName[colIndex].toString();
var value:String = columnData[rowIndex][colIndex].toString();
obj[key] = value;
} arrColl.addItem(obj);
}
} }
运行结果: