flex 保存datagrid数据到excel中

<?xml version="1.0"?>
<!-- dpcontrols/DataGridPassData.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
				initialize="initData()">
	<mx:Script>
		<![CDATA[
			import com.as3xls.xls.ExcelFile;
			import com.esri.ags.Units;
			import mx.controls.dataGridClasses.DataGridColumn;
			import com.as3xls.xls.Sheet;
			import mx.collections.*;
			private var DGArray:Array=[{Artist: 'Pavement',Album: 'Slanted and Enchanted',Price: 11.99},{Artist: 'Pavement',Album: 'Brighten the Corners',Price: 11.99}];


			[Bindable]
			public var initDG:ArrayCollection;


			//Initialize initDG ArrayCollection variable from the Array.
			//You can use this technique to convert an HTTPService,//WebService,or RemoteObject result to ArrayCollection.
			public function initData():void
			{
				initDG=new ArrayCollection(DGArray);
			}


			public static function export(dg:DataGrid,xlsName:String="统计"):FileReference
			{
				var _sheet:Sheet=new Sheet(); //Excel选项
				var _fileds:Array=[]; //需要呈现的字段组
				var iList:IList=dg.dataProvider as IList; //数据源
				var rowCount:int=iList.length; //有多少行数据
				var columns:Array=dg.columns; //有多少列数据
				_sheet.resize(rowCount + 1,dg.columnCount); //设置当前的选项卡有多少行多少列


				//循环所有的列
				for (var i:uint=0; i < columns.length; i++)
				{
					var dgc:DataGridColumn=columns[i];
					_sheet.setCell(0,i,dgc.headerText); //设置单元格 参数:1:行号 2:列号 3:单元格值
					_fileds.push(dgc); //保存字段
				}


				//循环所有数据
				for (var r:int=0; r < rowCount; r++)
				{
					var record:Object=iList.getItemAt(r);
					for (var c:uint=0; c < _fileds.length; c++)
					{
						_sheet.setCell(r + 1,c,record[_fileds[c].datafield]);
					}
				}


				var xls:ExcelFile=new ExcelFile();
				xls.sheets.addItem(_sheet); //把选项卡加入Excel中
				var bytes:ByteArray=xls.savetoByteArray();
				var fr:FileReference=new FileReference(); //保存对话框
				fr.save(bytes,xlsName + ".xls");
				return fr;
			}
		]]>
	</mx:Script>
	<mx:DataGrid id="myGrid"
				 width="350"
				 height="200"
				 dataProvider="{initDG}">
		<mx:columns>
			<mx:DataGridColumn datafield="Artist"/>
			<mx:DataGridColumn datafield="Album"/>
			<mx:DataGridColumn datafield="Price"/>
		</mx:columns>
	</mx:DataGrid>
	<mx:Button label="Export"
			   click="export(myGrid)"/>
			   
</mx:Application>