flex 和后台交互

01.<?xml version="1.0" encoding="utf-8"?> 
02.<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="initializeHandler(event)"> 
03.<mx:Script> 
04.<!--[CDATA[  
05.private function initializeHandler(event:Event):void {  
06.countriesService.send();  
07.}  
08.private function changeHandler(event:Event):void {  
09.statesService.send();  
10.}  
11.]]--> 
12.</mx:Script> 
13.<!-- 载入纯静态的xml数据 --> 
14.<mx:HTTPService id="countriesService" url="http://www.rightactionscript.com/states/xml/countries.xml" /> 
15.<!-- 载入由php生成的xml数据 --> 
16.<mx:HTTPService id="statesService" url="http://www.rightactionscript.com/states/xml/states.php"> 
17.<!-- 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 --> 
18.<mx:request> 
19.<country>{country.value}</country> 
20.</mx:request> 
21.</mx:HTTPService> 
22.<mx:VBox> 
23.<!-- 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 --> 
24.<mx:ComboBox id="country" dataProvider="{countriesService.lastResult.countries.country}" 
25.change="changeHandler(event)" /> 
26.<!-- 下面的ComboBox已经绑定了{statesService.lastResult.states.state},随它的数据改变而改变 --> 
27.<mx:ComboBox dataProvider="{statesService.lastResult.states.state}" /> 
28.</mx:VBox> 
29.</mx:Application> 
<?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>

二、URLLoader

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01.<?xml version="1.0" encoding="utf-8"?> 
02.<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="initializeHandler(event)"> 
03.<mx:Script> 
04.<!--[CDATA[  
05.private var _countriesService:URLLoader;  
06.private var _statesService:URLLoader;  
07.private function initializeHandler(event:Event):void {  
08._countriesService = new URLLoader();  
09._countriesService.addEventListener(Event.COMPLETE, countriesCompleteHandler);  
10._countriesService.load(new URLRequest("http://www.rightactionscript.com/states/xml/countries.xml"));  
11._statesService = new URLLoader();  
12._statesService.addEventListener(Event.COMPLETE, statesCompleteHandler);  
13.XML.ignoreWhitespace = true;  
14.}  
15.private function countriesCompleteHandler(event:Event):void {  
16.var xml:XML = new XML(_countriesService.data);  
17.country.dataProvider = xml.children();  
18.}  
19.private function statesCompleteHandler(event:Event):void {  
20.var xml:XML = new XML(_statesService.data);  
21.state.dataProvider = xml.children();  
22.}  
23.private function changeHandler(event:Event):void {  
24.var request:URLRequest = new URLRequest("http://www.rightactionscript.com/states/xml/states.php");  
25.var parameters:URLVariables = new URLVariables();  
26.parameters.country = country.value;  
27.request.data = parameters;  
28._statesService.load(request);  
29.}  
30.]]--> 
31.</mx:Script> 
32.<mx:VBox> 
33.<mx:ComboBox id="country" change="changeHandler(event)" /> 
34.<mx:ComboBox id="state" /> 
35.</mx:VBox> 
36.</mx:Application> 
<?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>

三、WebService 方法一

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01.<?xml version="1.0" encoding="utf-8"?> 
02.<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="initializeHandler(event)"> 
03.<mx:Script> 
04.<!--[CDATA[  
05.private function initializeHandler(event:Event):void {  
06.statesService.getCountries();  
07.}  
08.private function changeHandler(event:Event):void {  
09.statesService.getStates(country.value);  
10.}  
11.]]--> 
12.</mx:Script> 
13.<mx:WebService id="statesService" 
14.wsdl="http://www.rightactionscript.com/states/webservice/StatesService.php?wsdl"> 
15.<mx:operation name="getCountries" /> 
16.<mx:operation name="getStates" /> 
17.</mx:WebService> 
18.<mx:VBox> 
19.<mx:ComboBox id="country" 
20.dataProvider="{statesService.getCountries.lastResult}" change="changeHandler(event)" /> 
21.<mx:ComboBox dataProvider="{statesService.getStates.lastResult}" /> 
22.</mx:VBox> 
23.</mx:Application> 
<?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>

四、WebService 方法二

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01.<?xml version="1.0" encoding="utf-8"?> 
02.<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="initializeHandler(event)"> 
03.<mx:Script> 
04.<!--[CDATA[  
05.private function initializeHandler(event:Event):void {  
06.statesService.getCountries.send( );  
07.}  
08.private function changeHandler(event:Event):void {  
09.statesService.getStates.send( );  
10.}  
11.]]--> 
12.</mx:Script> 
13.<mx:WebService id="statesService" wsdl="http://www.rightactionscript.com/states/webservice/StatesService.php?wsdl"> 
14.<mx:operation name="getCountries" /> 
15.<mx:operation name="getStates"> 
16.<mx:request> 
17.<country>{country.value}</country> 
18.</mx:request> 
19.</mx:operation> 
20.</mx:WebService> 
21.<mx:VBox> 
22.<mx:ComboBox id="country" 
23.dataProvider="{statesService.getCountries.lastResult}" change="changeHandler(event)" /> 
24.<mx:ComboBox dataProvider="{statesService.getStates.lastResult}" /> 
25.</mx:VBox> 
26.</mx:Application>