Flex HTTPService 提交表单-优快云博客

本文介绍了使用Flash MX通过两种不同方法实现与后台服务器交互的过程。一种是利用URLVariables对象来传递参数，另一种则展示了如何使用mx:request标签配合状态管理(mx:State)实现登录验证功能。

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<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>