XML类包含用于处理XML对象的工作方法和属性。 XML类（以及XMLList，命名空间和QName类）基于ECMAScript中定义的XML（E4X）规范（ECMA - 357第2版）标准，实现了强大的XML处理在。使用toXMLString（）方法返回的XML对象的字符串表示不论XML对象具有简单内容还是复杂内容。
但是flex的xml操作还不支持xquery等简便、强大的查询操作，但是对于一般的xml结点读取、属性读取、结点查找、属性查找、结点遍历等还是完全可以胜任。
本文提供了一个xml操作的实用Demo，主要有下述3部分内容：
1）构建xml；
2）xml结点读取、属性读取、结点遍历等；
3）用户可以利用..先得到所有结点列表xmllist，然后遍历该xmllist查找任何元素、结点。
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<?xml version="1.0" encoding="utf-8"?> <!--xml 操作demo--> <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" width="800" height="600" creationComplete="init()" fontSize="11"> <s:layout> <s:BasicLayout/> </s:layout>
<fx:Script> <![CDATA[ protected function btnQuery_clickHandler(event:MouseEvent):void { var xmllist:XMLList = employees..employee; //列举所有员工信息
txtOpreate.text=""; for each(var item:XML in xmllist){ //遍历员工信息，看是否有匹配的zip if(item.address.zip==txtZip.text){ txtOpreate.text = item.toXMLString(); break; } } } ]]> </fx:Script>
<fx:Script> <![CDATA[ private var employees:XML; // protected function init():void{ //构建XML employees = <employees> <employee ssn="123-123-1234"> <name first="John" last="Doe"/> <address> <street>11 Main St.</street> <city>San Francisco</city> <state>CA</state> <zip>98765</zip> </address> </employee> <employee ssn="789-789-7890"> <name first="Mary" last="Roe"/> <address> <street>99 Broad St.</street> <city>Newton</city> <state>MA</state> <zip>01234</zip> </address> </employee> </employees>; //显示xml XML.prettyIndent = 2; //设置xml缩进量 txtSrc.text = employees.toXMLString(); }
protected function btnShow_clickHandler(event:MouseEvent):void { var output:String = ""; //employees.employee[0].address.zip, 98765 output+="employees.employee[0].address.zip: "+employees.employee[0].address.zip+"/r/n/r/n"; //employees.employee[1].@ssn, 789-789-7890 output+="employees.employee[1].@ssn: "+employees.employee[1].@ssn+"/r/n/r/n"; //employees.employee.name, <name first="John" last="Doe"/> //<name first="Mary" last="Roe"/> output+="employees.employee.name: "+employees.employee.name+"/r/n/r/n"; //employees..zip[0], 98765 output+="employees..zip[0]: "+employees..zip[0]+"/r/n/r/n"; //employees..@ssn[1], 789-789-7890 output+="employees..@ssn[1]: "+employees..@ssn[1]+"/r/n/r/n"; //employees..name, <name first="John" last="Doe"/> //<name first="Mary" last="Roe"/> output+="employees..name: "+employees..name+"/r/n/r/n"; //employees.employee[0].address.*, <street>11 Main St.</street> //<city>San Francisco</city> //<state>CA</state> //<zip>98765</zip> output+="employees.employee[0].address.*: "+employees.employee[0].address.*+"/r/n";
txtOpreate.text = output;
} ]]>-->
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