XML、XMLList、XMLListCollection、ArrayCollection相互转换

var userCollection:XMLListCollection = new XMLListCollection();
var usersXML:XML = event.result as XML;
var arrayCollection:ArrayCollection = new ArrayCollection();
var xmlList:XMLList = usersXML.elements("user");
userCollection.source = xmlList;
arrayCollection = userCollection.toArray();

其中event.result的返回值为xml格式的，如下：

<users>
   <user>
      <username>Dream</username>
      <clientIP>192.168.10.135</clientIP>
   </user>
</users>
<users>
   <user>
      <username>忧里修斯</username>
      <clientIP>192.168.10.125</clientIP>
   </user>
</users>