flex httpService如何给后台传值
最近看一些文档,总结了一些<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>
