1、采用<s:HTTPService>标签来实现:

<?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" >

  <s:Label x="61" y="138" text="HttpService:"/>
  <s:TextInput x="152" y="128" >     </s:HTTPService>
  </fx:Declarations>
</s:Application>

2、采用创建HTTPService对象:

<?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" >

  <s:Label x="61" y="138" text="HttpService:"/> 
  <s:TextInput x="152" y="128" /> 

  <fx:Script> 
    <![CDATA[ 
      import mx.rpc.events.ResultEvent;
      import mx.controls.Alert;
      import mx.rpc.events.FaultEvent;
      import mx.rpc.http.HTTPService;

      protected function button2_clickHandler(event:MouseEvent):void 
      { 
        

        var http:HTTPService = new HTTPService();
        http.url = "http://localhost:8080/html/FlexServlet0?name="+http_txt.text;
        http.send();
        http.addEventListener(ResultEvent.RESULT,httpSerResultHandler);
        http.addEventListener(FaultEvent.FAULT,httpSerFaultHandler);

      } 
      private function login(event:MouseEvent):void{
        httpSer.send();//发送请求
      }
      //返回成功事件
      private function httpSerResultHandler(event:ResultEvent):void{
        Alert.show(event.result.toString(),"登录提示");
      }
      //返回失败事件
      private function httpSerFaultHandler(event:FaultEvent):void{
        Alert.show(event.fault.message as String,"登录提示");
      }
    ]]> 
  </fx:Script> 
  <fx:Declarations>
    
  </fx:Declarations>
</s:Application>

3、在JavaWeb项目中新建Servlet(FlexServlet) :

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		  String name = request.getParameter("name");   
              response.setCharacterEncoding("UTF-8");   
              PrintWriter pw = response.getWriter();   
              pw.write("你好["+name+"]这是来自Httpservice的消息...当前Session是:"+request.getSession());   
              pw.close();   
	}

  

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