返回json转换ArrayCollection

时间：2010-03-18 来源：xue2

//result数据：
public static const result:String = '{"result":1,"list":[{"realname":"某男1","age":"29","born":"1980-6-26","cardid":"01030418008064422"},' + 
        '{"realname":"某男2","age":"33","born":"1976-6-1","cardid":"01030418008064422"},' + 
        '{"realname":"某女1","age":"33","born":"1976-6-1","cardid":"01030418008064422"},' + 
        '{"realname":"某女2","age":"33","born":"1976-6-1","cardid":"01030418008064422"},' + 
        '{"realname":"某男3","age":"33","born":"1976-6-1","cardid":"01030418008064422"},' + 
        '{"realname":"某女3","age":"33","born":"1976-6-1","cardid":"01030418008064422"}]}'; 
 
var objJson:Object = new Object();
objJson = JSON.decode(result);
var listData:ArrayCollection = new ArrayCollection(objJson.list as Array)
 
//可以在其他控件中指定dataProvider为listData，如
datagrid.dataProvider = listData;

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在Flex中使用Json十分方便。json是介于纯文本方式与xml方式之间的一种格式，json能做到的事情，xml完成可以做到。为什么要用json呢，我看大部分还是像我一样，不得不用。json是ajax数据传输的首选，现有的项目使用的已经是json，如果增加flex界面时也使用json,那改动就会非常少。扫盲贴中说出的三个理由，我觉得这一个最充分。

要在flex中使用json，首先要下一个json包。是官方的，却在官方怎么也载不下来。终于在CSDN上用了３分才down下来。放在附件中，需要的可以拿去用。

贴一个例子：

Xml代码

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"
creationComplete="init()">
<mx:Script>
<![CDATA[
import com.adobe.serialization.json.*;
private var jsonStr:String;
private var jsonObj:Object;
private var jsonObj2:Object;
private var jsonStr2:String;
internal function init():void{
jsonStr = '{"name":"zhanzhihu","age":22,"gender":"male"}';
jsonObj = new Object();
jsonObj = JSON.decode(jsonStr);
trace(jsonObj.name);
jsonObj2 = new Object();
jsonObj2.firstName = "bill";
jsonObj2.lastName = "Gate";
jsonObj2.com = "Microsoft";
jsonStr2 = JSON.encode( jsonObj2 );
trace( jsonStr2 );
}
]]>
</mx:Script>
</mx:Application>

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="init()"> <mx:Script> <![CDATA[ import com.adobe.serialization.json.*; private var jsonStr:String; private var jsonObj:Object; private var jsonObj2:Object; private var jsonStr2:String; internal function init():void{ jsonStr = '{"name":"zhanzhihu","age":22,"gender":"male"}'; jsonObj = new Object(); jsonObj = JSON.decode(jsonStr); trace(jsonObj.name); jsonObj2 = new Object(); jsonObj2.firstName = "bill"; jsonObj2.lastName = "Gate"; jsonObj2.com = "Microsoft"; jsonStr2 = JSON.encode( jsonObj2 ); trace( jsonStr2 ); } ]]> </mx:Script> </mx:Application>

输出为：

zhanzhihu
{"firstName":"bill","lastName":"Gate","com":"Microsoft"}

jsonStr是一个json格式的字符串，用JSON.decode(String)便可以将它解析为as对象，同样用JSON.encode(Object)可以将as对象转为json字符串，flex前台对json的操作真是方便。

corelib.rar (38.3 KB)
描述: corelib.swc
下载次数: 458

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具体需要调用外部免费的ActionScript 3核心库(http://as3corelib.googlecode.com)，里面包含了JSON解码器和JSON编码器。下载回来把lib目录的as3corelib.swc文件附加到FlexBulider项目的libs目录下即可。具体如何使用还有待学习学习……