URLRequest

Flex中使用NavigateToURL实现HTML预览

Categories: Flex; Tagged with: ActionScript • Flex • navigateToURL • POST • URLRequest; @ November 10th, 2010 21:04

尚未发现Flex中有可以直接渲染HTML代码的组件, 但可通过服务器端配合实现预览.

原理: Flex(尤指AIR环境), 使用URLLoader发送POST请求, 将要预览的HTML代码发送到服务器端Servlet, 服务器端收到请求后创建临时文件, 将HTML存到临时文件中. Flex端收到URLLoader Complete事件后, 使用navigateToURL navigate到Servlet上(使用GET), Servelet 返回文件内容 —- 在上述过程中, Flex端生成UUID作为代码读写的key.

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Flex: 使用URLRequest下载文件时的权限验证

Categories: Flex; Tagged with: ActionScript • FileReference • Flex • URLRequest; @ January 27th, 2010 23:49

权限验证:

var fileRef:FileReference = new FileReference();
		var request:URLRequest = new URLRequest(serviceUrl);

		request.method = URLRequestMethod.POST;
		var encoder : Base64Encoder = new Base64Encoder();
		encoder.encode(userName + ":" + password);
		request.requestHeaders.push(new URLRequestHeader("Authorization", "Basic " + encoder.toString())); // ** 增加认证信息

		fileRef.addEventListener(Event.OPEN, onFileDownloadBegin);
		fileRef.addEventListener(Event.COMPLETE, onFileDownloadComplete);
		fileRef.addEventListener(IOErrorEvent.IO_ERROR, onFileDownloadError);
		fileRef.addEventListener(Event.CANCEL, onFileDownLoadCancel);
		fileRef.download(request, getExportFileName(serviceUrl));

Flex: 使用URLRequest进行下载, 并监听有关事件

Categories: Flex; Tagged with: ActionScript • DownLoad • Flex • URLRequest; @ January 27th, 2010 23:46

使用URLRequest下载文件. – 无权限认证

// 下载文件
	protected function downloadTemplateFile():void {
		var fileRef:FileReference = new FileReference();
		var urlReq:URLRequest = new URLRequest(_pathTemplateFile);
		fileRef.addEventListener(Event.OPEN,onDownloadBegin);
		fileRef.addEventListener(Event.COMPLETE, onDownloadComplete);
		fileRef.addEventListener(Event.CANCEL, onDownloadCancel);
		fileRef.addEventListener(IOErrorEvent.IO_ERROR, onDownloadError);
		fileRef.download(urlReq);
	}

	// 模板文件下载开始时响应.
	protected function onDownloadBegin(e:Event):void {
		appendTextToOutPut(RM.getString(BUNDLE_ASMT_MGT, "template.download.begin"));
	}

	// 当下载结束后响应. */
	protected function onDownloadComplete(e:Event):void {
		var file:FileReference = e.target as FileReference;
		appendTextToOutPut(RM.getString(BUNDLE_ASMT_MGT, "template.download.success", [file.name, FileUtils.formatFileSize(file.size)]));
		log.info("模板文件下载结束: " + file.name + "-" + file.size);
	}

	// 当下载取消时响应. */
	protected function onDownloadCancel(e:Event):void {
		appendTextToOutPut(RM.getString(BUNDLE_ASMT_MGT, "controller.download.canceled"));
	}

	// 当下载出现错误时响应. */
	protected function onDownloadError(e:IOError):void {
		appendTextToOutPut(RM.getString(BUNDLE_ASMT_MGT, "template.download.error", [e.message]));
		log.error("下载出错" + e.message);
	}