Flash/Flex学习笔记(4)：如何打开网页及Get/Post数据

//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);
　}
}

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);
}

/// 
/// 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;
　　}
　}
}