flash终究只是客户端技术,所以很多时候还是需要与服务端技术(比如asp,asp.net,jsp,php之类)进行数据交互的,下面的代码演示了如何在flash中打开网页,以及用GET/POST二种方式向服务端发送数据
服务端FlashHander.ashx可以这样处理:
注意:返回的字符串格式为 name1=value1&name2=value2&name3=value3... 如果name和value中本身包含"="与"&",请注意用其它字符替换掉
//按下按钮,打开网页 btnOpen.addEventListener(MouseEvent.CLICK, function(){ navigateToURL(new URLRequest("http://www.g.cn/search?hl=zh-CN&q=" + encodeURIComponent(txtId.text)),"_blank"); }); //以Get方式发送数据(发送就完事,不会理会服务端是否响应) btnSend.addEventListener(MouseEvent.CLICK, function(){ sendToURL(new URLRequest("/default.aspx?q=" + encodeURIComponent(txtId.text))); }); btnPost.addEventListener(MouseEvent.CLICK,fnPostData); //以Post方式发送数据(同样:发送就完事,不会理会服务端是否响应) function fnPostData(e:MouseEvent) { var _urlReq:URLRequest = new URLRequest(); _urlReq.url = "/default.aspx"; _urlReq.method = URLRequestMethod.POST; var _data:URLVariables = new URLVariables(); _data.q = "菩提树下的杨过"; //即传递 q = 菩提树下的杨过,注:经测试,Flash会自动对传递的数据做encodeURIComponent处理,所以此外不能再加encodeURIComponent,否则就是二次编码了 _urlReq.data = _data; sendToURL(_urlReq); }
服务端可以这样处理:
protected void Page_Load(object sender, EventArgs e) { string q = Request["q"]; if (!string.IsNullOrEmpty(q)) { string _file = Server.MapPath("~/log.txt"); File.AppendAllText(_file,q + "\t" + Request.HttpMethod + "\t" + DateTime.Now + Environment.NewLine); } }如果发送了数据后,还要响应服务端的结果(比如取得服务端的返回值,再继续到Flash中处理),Flash中可这样写:
var loader:URLLoader = new URLLoader(); configureListeners(loader); var request:URLRequest=new URLRequest("/FlashHander.ashx?q=" + encodeURIComponent("菩提树下的杨过")); try { loader.load(request); } catch (error:Error) { trace("Unable to load requested document."); } //定义各种情况的回调函数 function configureListeners(dispatcher:IEventDispatcher):void { dispatcher.addEventListener(Event.COMPLETE, completeHandler); dispatcher.addEventListener(Event.OPEN, openHandler); dispatcher.addEventListener(ProgressEvent.PROGRESS, progressHandler); dispatcher.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityErrorHandler); dispatcher.addEventListener(HTTPStatusEvent.HTTP_STATUS, httpStatusHandler); dispatcher.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler); } //加载完成时,将触发 function completeHandler(event:Event):void { var loader:URLLoader=URLLoader(event.target); trace("completeHandler: " + loader.data); lblReceive.text = loader.data; //本例中,服务端返回: msg=Hello World&Method=GET&q=菩提树下的杨过 var vars:URLVariables=new URLVariables(loader.data); trace("The Method is " + vars.Method); //服务端返回的字符串中如果有 Method=xxx 这样的字符,则Flash中可以直接用vars.Method进行访问 } //刚开始请求时,将触发 function openHandler(event:Event):void { trace("openHandler: " + event); } //下载进度发生变化时,将触发(可利用这个做加载进度条) function progressHandler(event:ProgressEvent):void { trace("progressHandler loaded:" + event.bytesLoaded + " total: " + event.bytesTotal); } //因安全原因出现错误时,将触发 function securityErrorHandler(event:SecurityErrorEvent):void { trace("securityErrorHandler: " + event); } //http请求状态变化时,将触发 function httpStatusHandler(event:HTTPStatusEvent):void { trace("httpStatusHandler: " + event); } //io错误时,将触发 function ioErrorHandler(event:IOErrorEvent):void { trace("ioErrorHandler: " + event); }
服务端FlashHander.ashx可以这样处理:
注意:返回的字符串格式为 name1=value1&name2=value2&name3=value3... 如果name和value中本身包含"="与"&",请注意用其它字符替换掉
/// /// Summary description for FlashHander /// public class FlashHander : IHttpHandler { public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; context.Response.Write("msg=Hello World&Method=" + context.Request.HttpMethod + "&q=" + context.Request["q"]); } public bool IsReusable { get { return false; } } }