读取XML

TreeMenus.xml

<?xml version="1.0" encoding="utf-8" ?>
<menus>
    <node label="Mail">
        <node label="Inbox" />
        <node label="Personal Folder">
            <node label="Demo" />
            <node label="Personal" />
            <node label="Saved Mail" />
            <node label="bar" />
        </node>
        <node label="Calendar" />
        <node label="Sent" />
        <node label="Trash" />
    </node>
</menus>

ReadXML.mxml

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" creationComplete="initApp()">
    <mx:Script>
        <![CDATA[
            import mx.collections.ArrayCollection;            
            import mx.rpc.events.ResultEvent;
            
            public var loader:URLLoader = new URLLoader();
            public var menus:XML = new XML();
            
            public function initApp():void
            {
                var request:URLRequest = new URLRequest("TreeMenus.xml");
                loader.load(request);
                loader.addEventListener(Event.COMPLETE, completeHandle);
            }
            
            public function completeHandle(e:Event):void
            {
                menus = XML(loader.data);
                var results:XMLList = menus.node;
                
                tree.dataProvider = results;
            }
        ]]>
    </mx:Script>
    <mx:Tree id="tree" width="218" height="397" labelField="@label"></mx:Tree>
    <mx:Button label="Button"/>
</mx:Application>

var request:URLRequest = new URLRequest("TreeMenus.xml");
这里的TreeMenus.xml也可以用一个输出xml格式的asp.net页面代替，aa.aspx?id=2可以这样接受参数。
URLRequest对象也常用与通过URL添加保存删除数据，如：addNews.aspx?title=新闻标题&content=新闻内容。