XML转换成ArrayCollection类型

最新推荐文章于 2025-08-04 21:05:58 发布

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最新推荐文章于 2025-08-04 21:05:58 发布

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分类专栏： Flex 文章标签： xml application apple object import structure

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本文介绍如何将XML数据转换为Flex中的ArrayCollection格式，以便于在图表等组件中使用。提供了几种不同的实现方法，包括直接遍历XML节点和利用SimpleXMLDecoder进行解析。

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private function xmlListToArray(listXMLList):Array { var array:Array = new Array(); var i:int = 0; var j:int = 0; var k:int = 0; var obj:Object; var subItem1XML; var subItem2XML; var str:String; for (i=0; i < list.length(); i++) { obj = new Object(); subItem1 = list as XML; for (j = 0; j < subItem1.children().length(); j++){ subItem2 = subItem1.children()[j] as XML; k = subItem2.toXMLString().indexOf("/>"); if (k == -1) k = subItem2.toXMLString().indexOf(">"); str = subItem2.toXMLString().substring(1, k); obj[str] = subItem2.text(); } array.push(obj); } return array; }

例子:

import mx.collections.ArrayCollection; var node : XML = <books> <book type="paperback"> <author>Author1</author> <name>Book 1</name> </book> <book type="hardcover"> <author>Author2</author> <name>Book 2</name> </book> </books>; var authors : ArrayCollection = new ArrayCollection(); for each (var a : XML in node..author) { authors.addItem(a); }

然后authors里面就是<author>Author1</author>和<author>Author1</author>这两个节点的内容了。
node..author这个是一个E4X表达式，意思是从node表示的节点里找出所有author节点。

For example1:

如果你使用的HTtp service，在得到结果可以转换：
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="srv.send()"> <mx:Script></mx:Script> <mx:HTTPService id="srv" url="../assets/data.xml" useProxy="false" result="myData=ArrayCollection(srv.lastResult.data.result)" /> <mx:Panel title="Line Chart"> <mx:LineChart id="chart" dataProvider="{myData}"> <mx:horizontalAxis> <mx:CategoryAxis categoryField="month"/> </mx:horizontalAxis> <mx:series> <mx:LineSeries yField="apple" name="Apple"/> <mx:LineSeries yField="orange" name="Orange"/> <mx:LineSeries yField="banana" name="Banana"/> </mx:series> </mx:LineChart> </mx:Panel> </mx:Application>

另一方法：

<?xml version="1.0"?>  <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="srv.send()"> <mx:Script></mx:Script> <mx:HTTPService id="srv" url="../assets/data.xml" resultFormat="e4x" /> <mx:XMLListCollection id="myAC" source="{srv.lastResult.result}" /> <mx:Panel title="Line Chart"> <mx:LineChart id="chart" dataProvider="{myAC}"> <mx:horizontalAxis> <mx:CategoryAxis categoryField="month"/> </mx:horizontalAxis> <mx:series> <mx:LineSeries yField="apple" name="Apple"/> <mx:LineSeries yField="orange" name="Orange"/> <mx:LineSeries yField="banana" name="Banana"/> </mx:series> </mx:LineChart> </mx:Panel> </mx:Application>

http://hillelcoren.com/2008/09/21/flex-tip-convert-xml-to-arraycollection/提供的方法：

This is one of those things that took me much longer than I thought it would have. I needed to convert a file containing XML data to an ArrayCollection. My XML file looked like this:

<rows>
	<row>
		<col1>some value</col1>
		<col2>another value</col2>
		...
	</row>
	...
</rows>

I wanted to convert this into an ArrayCollection with each row as an object (and I didn’t want to have to loop through each item in the list). Here’s the solution I’m using.

import mx.utils.ArrayUtil;
import mx.rpc.xml.SimpleXMLDecoder;
import mx.collections.ArrayCollection;

private function convertXmlToArrayCollection( file:String ):ArrayCollection
{
	var xml:XMLDocument = new XMLDocument( file );

	var decoder:SimpleXMLDecoder = new SimpleXMLDecoder();
	var data:Object = decoder.decodeXML( xml );
	var array:Array = ArrayUtil.toArray( data.rows.row );

	return new ArrayCollection( array );
}

I’m not thrilled with this approach because I’ve needed to hard code the XML structure (’rows.row’) into the function. If anyone has a better solution I’d love to see it.