Flex HTTPService 提交表单

<mx:HTTPService>给后台传递参数的方法,列举如下:

方法1:采用URLVariables对象

<?xml version="1.0" encoding="utf-8"?>   
  
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"   
  
     layout="absolute" fontSize="12">   
  
    <mx:Script>   
  
        <![CDATA[   
  
            import mx.controls.Alert;   
  
            import mx.rpc.events.ResultEvent;   
  
            //对提交给后台的参数进行UTF-8的编码处理   
  
            private function httpEncoding(param:String):String{   
  
                return encodeURIComponent(param);   
  
            }   
  
            private function httpEncoding0(param:String):String{   
  
                return param;//encodeURI(param);   
  
            }   
  
            private function doRequest():void{   
  
                btn_do.enabled=false;   
  
                var url:String = "http://localhost:8600/grid.jsp";   
  
                //以下那样写后台会乱码,不管是否做URI编码转换   
  
                //url += "?user="+httpEncoding0("用户名");   
  
                //url += "&psw="+httpEncoding0("密码");   
  
                //trace(url);   
  
                srv.url = url;   
  
                //srv.send();   
  
                //以下这样写正常   
  
                var params:URLVariables = new URLVariables();   
  
                //这个user,psw就是传入后台的参数user,jsp就用 request.getParameter("user")来取   
  
                params.user = httpEncoding("用户名");   
  
                params.psw = httpEncoding("密码");   
  
                srv.send(params);              
  
            }   
  
            private function resultHandler(event:ResultEvent):void{   
  
                Alert.show("与后台交互结束,前台开始取得的数据...","提示信息");   
  
                btn_do.enabled=true;   
  
            }   
  
        ]]>   
  
    </mx:Script>   
  
    <mx:HTTPService id="srv" result="resultHandler(event);"/>   
  
    <mx:Panel title="测试与jsp后台交互" layout="absolute" width="100%" height="90%">   
  
        <mx:Button id="btn_do" label="取得数据" click="doRequest();"/>   
  
        <mx:Spacer height="1"/>   
  
        <mx:DataGrid dataProvider="{srv.lastResult.catalog.product}" width="100%" height="100%" y="28"/>       
  
    </mx:Panel>   
  
</mx:Application> 

方法2:采用<mx:request/>,同时也演示了mx:State的用法,[来自网上]

<?xml version="1.0" encoding="utf-8"?>   
  
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">   
  
    <mx:states>   
  
        <mx:State name="Logged In">   
  
            <mx:SetProperty target="{panel1}" name="width" value="95%"/>   
  
            <mx:SetProperty target="{panel1}" name="height" value="95%"/>   
  
            <mx:RemoveChild target="{password}"/>   
  
            <mx:RemoveChild target="{username}"/>   
  
            <mx:RemoveChild target="{label1}"/>   
  
            <mx:RemoveChild target="{Submit}"/>   
  
            <mx:RemoveChild target="{label2}"/>   
  
            <mx:SetProperty target="{panel1}" name="title" value="Members Section"/>   
  
            <mx:AddChild relativeTo="{panel1}" position="lastChild">   
  
                <mx:Label x="10" y="10" text="Welcome to the Members Section!"/>   
  
            </mx:AddChild>   
  
            <mx:AddChild relativeTo="{panel1}" position="lastChild">   
  
                <mx:Label x="10" y="36" text="Here you can do great things, like join the forums @ Viper Creations!"/>   
  
            </mx:AddChild>   
  
            <mx:AddChild relativeTo="{panel1}" position="lastChild">   
  
                <mx:Label x="10" y="62" text="Label"/>   
  
            </mx:AddChild>   
  
        </mx:State>   
  
    </mx:states>   
  
    <mx:Script>   
  
        <![CDATA[   
  
            import mx.rpc.events.ResultEvent;              
  
        ]]>   
  
    </mx:Script>   
  
    <mx:Script>   
  
<![CDATA[   
  
  
private function checkLogin(evt:ResultEvent):void   
{   
  
    if(evt.result.loginsuccess == "yes")   
    {   
        currentState = "Logged In";   
  
    }   
  
  
  
    if(evt.result.loginsuccess == "no")   
    {   
        mx.controls.Alert.show('Invalid username/password');   
    }          
  
}   
  
]]>   
  
</mx:Script>   
  
    <mx:HTTPService id="login_user" result="checkLogin(event)" showBusyCursor="true" method="POST" url="http://www.vipercreations.com/site_admin/login.php" useProxy="false">   
  
        <mx:request xmlns="">   
            <username>   
                {username.text}   
            </username>   
  
            <password>   
                {password.text}   
            </password>   
  
        </mx:request>   
  
    </mx:HTTPService>   
     
  
    <mx:Panel resizeEffect="Resize" width="250" height="200" layout="absolute" title="Login System" horizontalCenter="0" verticalCenter="-2" id="panel1">   
  
        <mx:Label x="10" y="10" text="Username:" id="label1"/>   
  
        <mx:TextInput x="10" y="36" id="username"/>   
  
        <mx:Label x="10" y="66" text="Password:" id="label2"/>   
  
        <mx:TextInput x="10" y="92" id="password" displayAsPassword="true"/>   
  
        <mx:Button x="10" y="122" label="Submit" id="Submit" click="login_user.send();"/>   
  
    </mx:Panel>   
  
</mx:Application> 

From http://shang.iteye.com/blog/419868