Flex远程访问获取数据--HTTPService

编写service类：

package services {
    import com.adobe.serialization.json.JSON;

    import log.LogUtil;

    import mx.collections.ArrayCollection;
    import mx.collections.XMLListCollection;
    import mx.controls.Alert;
    import mx.rpc.events.ResultEvent;
    import mx.rpc.http.mxml.HTTPService;

    public class CategoryService extends HTTPService {
        [Bindable]
        public var categoryArray:ArrayCollection;
        public var testFlag:Boolean = true;

        public function CategoryService(rootURL:String=null, destination:String=null) {
            super(rootURL, destination);
            this.url = "http://192.168.1.210:8081/xxx.action";
//url为远程请求接口
            addEventListener(ResultEvent.RESULT, handleCategoryResult);

        }

        private function handleCategoryResult(event:ResultEvent):void{
            var rawData:String =  String(event.result);
            trace(rawData);
            LogUtil.debug("CategoryService",rawData);
            var o:Object = com.adobe.serialization.json.JSON.decode(rawData);//对结果进行json转换
            categoryArray = new ArrayCollection(o.result);
        }    

    }
}

结果集接收之后进行json格式转换，需要导入as3corelib.swc
在XML中引入：

<fx:Declarations>
        <!-- 将非可视元素（例如服务、值对象）放在此处 -->
        <services:CategoryService id="categoryService"/>
    </fx:Declarations>

在方法中调用：

<?xml version="1.0" encoding="utf-8"?>
<s:Group 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="342" height="60" xmlns:services="services.*" initialize="group1_initializeHandler(event)">
    <fx:Declarations>
        <!-- 将非可视元素（例如服务、值对象）放在此处 -->
        <services:CategoryService id="categoryService"/>
    </fx:Declarations>

    <fx:Script>
        <![CDATA[
            import mx.collections.ArrayCollection;
            import mx.events.FlexEvent;

            import spark.events.IndexChangeEvent;

            protected function group1_initializeHandler(event:FlexEvent):void
            {
                if(categoryService.testFlag){
                    categoryService.localTest();
                }else{
                    categoryService.send();
                }

            }

        ]]>
    </fx:Script>

       <s:DropDownList id="categoryList" x="92" y="29" width="174"
                dataProvider="{categoryService.categoryArray}"
                labelField="name"
                prompt="请选择"
                change="updateSelection(event);"
                />

</s:Group>