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    首页»Flash»Flex与后台交互的几种方法详解

    Flex与后台交互的几种方法详解

    来源:Web开发者 发布时间:2012-02-29 阅读次数:

    1.FlashVars(单向传递)

    A.传递:在<embed 中设置 FlashVars=”name1=value1&name2=value2”
    B.接受:在as中写入 var value1=application.parameters.name1 即可

    2.HttpService

    <?xml version="1.0" encoding="utf-8"?> 
    <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="initializeHandler(event)"> 
    <mx:Script> 
    <![CDATA[ 
    private function initializeHandler(event:Event):void { 
    countriesService.send(); 
    } 
    private function changeHandler(event:Event):void { 
    statesService.send(); 
    } 
    ]]> 
    </mx:Script> 
    <!-- 载入纯静态的xml数据 --> 
    <mx:HTTPService id="countriesService" url="http://www.rightactionscript.com/states/xml/countries.xml" /> 
    <!-- 载入由php生成的xml数据 --> 
    <mx:HTTPService id="statesService" url="http://www.rightactionscript.com/states/xml/states.php"> 
    <!-- 以下标签就是要发送到服务端的数据了,可以这样理解:有一个名为country的变量,它的值为花括号{}里的内容 --> 
    <mx:request> 
    <country>{country.value}</country> 
    </mx:request> 
    </mx:HTTPService> 
    <mx:VBox> 
    <!-- 此控件的数据由第一个<mx:HTTPService/>控件接收的内容提供,并且由这个ComboBox控制着第二个ComboBox所要显示的内容 -->
    <mx:ComboBox id="country" dataProvider="{countriesService.lastResult.countries.country}" 
    change="changeHandler(event)" /> 
    <!-- 下面的ComboBox已经绑定了{statesService.lastResult.states.state},随它的数据改变而改变 --> 
    <mx:ComboBox dataProvider="{statesService.lastResult.states.state}" /> 
    </mx:VBox> 
    </mx:Application> 
    

    3.URLLoader

    <?xml version="1.0" encoding="utf-8"?> 
    <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="initializeHandler(event)"> 
    <mx:Script> 
    <![CDATA[ 
    private var _countriesService:URLLoader; 
    private var _statesService:URLLoader; 
    private function initializeHandler(event:Event):void { 
    _countriesService = new URLLoader(); 
    _countriesService.addEventListener(Event.COMPLETE, countriesCompleteHandler); 
    _countriesService.load(new URLRequest("http://www.rightactionscript.com/states/xml/countries.xml")); 
    _statesService = new URLLoader(); 
    _statesService.addEventListener(Event.COMPLETE, statesCompleteHandler); 
    XML.ignoreWhitespace = true; 
    } 
    private function countriesCompleteHandler(event:Event):void { 
    var xml:XML = new XML(_countriesService.data); 
    country.dataProvider = xml.children(); 
    } 
    private function statesCompleteHandler(event:Event):void { 
    var xml:XML = new XML(_statesService.data); 
    state.dataProvider = xml.children(); 
    } 
    private function changeHandler(event:Event):void { 
    var request:URLRequest = new URLRequest("http://www.rightactionscript.com/states/xml/states.php"); 
    var parameters:URLVariables = new URLVariables(); 
    parameters.country = country.value; 
    request.data = parameters; 
    _statesService.load(request); 
    } 
    ]]> 
    </mx:Script> 
    <mx:VBox> 
    <mx:ComboBox id="country" change="changeHandler(event)" /> 
    <mx:ComboBox id="state" /> 
    </mx:VBox> 
    </mx:Application> 
    

    4.WebService方法1

    <?xml version="1.0" encoding="utf-8"?> 
    <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="initializeHandler(event)"> 
    <mx:Script> 
    <![CDATA[ 
    private function initializeHandler(event:Event):void { 
    statesService.getCountries(); 
    } 
    private function changeHandler(event:Event):void { 
    statesService.getStates(country.value); 
    } 
    ]]> 
    </mx:Script> 
    <mx:WebService id="statesService" 
    wsdl="http://www.rightactionscript.com/states/webservice/StatesService.php?wsdl"> 
    <mx:operation name="getCountries" /> 
    <mx:operation name="getStates" /> 
    </mx:WebService> 
    <mx:VBox> 
    <mx:ComboBox id="country" 
    dataProvider="{statesService.getCountries.lastResult}" change="changeHandler(event)" /> 
    <mx:ComboBox dataProvider="{statesService.getStates.lastResult}" /> 
    </mx:VBox> 
    </mx:Application> 
    

    5.WebService方法2

    <?xml version="1.0" encoding="utf-8"?> 
    <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="initializeHandler(event)"> 
    <mx:Script> 
    <![CDATA[ 
    private function initializeHandler(event:Event):void { 
    statesService.getCountries.send( ); 
    } 
    private function changeHandler(event:Event):void { 
    statesService.getStates.send( ); 
    } 
    ]]> 
    </mx:Script> 
    <mx:WebService id="statesService" wsdl="http://www.rightactionscript.com/states/webservice/StatesService.php?wsdl"> 
    <mx:operation name="getCountries" /> 
    <mx:operation name="getStates"> 
    <mx:request> 
    <country>{country.value}</country> 
    </mx:request> 
    </mx:operation> 
    </mx:WebService> 
    <mx:VBox> 
    <mx:ComboBox id="country" 
    dataProvider="{statesService.getCountries.lastResult}" change="changeHandler(event)" /> 
    <mx:ComboBox dataProvider="{statesService.getStates.lastResult}" /> 
    </mx:VBox> 
    </mx:Application>

     

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