首先需要一个需要提供一个WebService服务。 这里用一个天气预报的webservice为例，如中国气象局的免费服务http://www.webxml.com.cn/WebServices/WeatherWebService.asmx?wsdl

通过下面这个网址可以输入城市，查询城市天气预报

http://www.webxml.com.cn/WebServices/WeatherWebService.asmx?op=getWeatherbyCityName

下面开始示例:

xml代码:

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<?xml version="1.0" encoding="utf-8"?> 
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"   
               xmlns:s="library://ns.adobe.com/flex/spark"   
               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"> 
    <fx:Script> 
        <!--[CDATA[  
            import mx.controls.Alert;  
            import mx.rpc.events.FaultEvent;  
            import mx.rpc.events.ResultEvent;  
            //调用成功  
            protected function webservice_resultHandler(event:ResultEvent):void  
            {  
                message.text = (String)(event.result);  
            }  
 
            //调用失败  
            protected function webservice_faultHandler(event:FaultEvent):void  
            {  
                Alert.show("调用失败了," + event.fault.message as String, "提示");  
            }  
 
            protected function serach_clickHandler(event:MouseEvent):void  
            {  
                webservice.getWeatherbyCityName(city.text);  
            }  
        ]]--> 
    </fx:Script> 
    <fx:Declarations> 
        <!-- 将非可视元素（例如服务、值对象）放在此处 --> 
        <s:WebService id="webservice" 
                      wsdl="http://www.webxml.com.cn/WebServices/WeatherWebService.asmx?wsdl"   
                      result="webservice_resultHandler(event)"   
                      fault="webservice_faultHandler(event)" 
                      showBusyCursor="true" /> 
    </fx:Declarations> 
    <s:TextInput x="138" y="85" id="city"/> 
    <s:Button x="298" y="86" label="Search" id="serach" click="serach_clickHandler(event)" /> 
    <s:TextArea x="138" y="136" width="441" id="message"/> 
</s:Application> 
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
      xmlns:s="library://ns.adobe.com/flex/spark"
      xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">
 <fx:Script>
  <!--[CDATA[
   import mx.controls.Alert;
   import mx.rpc.events.FaultEvent;
   import mx.rpc.events.ResultEvent;
   //调用成功
   protected function webservice_resultHandler(event:ResultEvent):void
   {
    message.text = (String)(event.result);
   }

//调用失败
   protected function webservice_faultHandler(event:FaultEvent):void
   {
    Alert.show("调用失败了," + event.fault.message as String, "提示");
   }

protected function serach_clickHandler(event:MouseEvent):void
   {
    webservice.getWeatherbyCityName(city.text);
   }
  ]]-->
 </fx:Script>
 <fx:Declarations>
  <!-- 将非可视元素（例如服务、值对象）放在此处 -->
  <s:WebService id="webservice"
       wsdl="http://www.webxml.com.cn/WebServices/WeatherWebService.asmx?wsdl"
       result="webservice_resultHandler(event)"
       fault="webservice_faultHandler(event)"
       showBusyCursor="true" />
 </fx:Declarations>
 <s:TextInput x="138" y="85" id="city"/>
 <s:Button x="298" y="86" label="Search" id="serach" click="serach_clickHandler(event)" />
 <s:TextArea x="138" y="136" width="441" id="message"/>
</s:Application>

OK,运行应用程序，输入城市名称,you can see: