WebAdapterServlet运行机制(3) --对request的处理
首先处理变量改变,并处罚变量改变事件,最后形成连锁反映执行各种操作
// Change all variables based on request parameters
Map unhandledParameters =
variableMap.handleVariables(request, application); 判断request是否是一个downloadstream.
private DownloadStream handleURI(
Application application,
HttpServletRequest request,
HttpServletResponse response) 
{
String uri = request.getPathInfo();
// If no URI is available
if (uri == null || uri.length() == 0 || uri.equals("/"))
return null;
// Remove the leading /
while (uri.startsWith("/") && uri.length() > 0)
uri = uri.substring(1);
// Handle the uri
DownloadStream stream = null;
try {
stream = application.handleURI(application.getURL(), uri);
} catch (Throwable t) {
application.terminalError(new URIHandlerErrorImpl(application, t));
}
return stream;
} 如果stream 为null,则不是下载请求.
window = getApplicationWindow(request, application); 处理参数
// Handle the unhandled parameters if the application is still running
if (window != null
&& unhandledParameters != null
&& !unhandledParameters.isEmpty()) {
try {
window.handleParameters(unhandledParameters);
} catch (Throwable t) {
application.terminalError(
new ParameterHandlerErrorImpl(window, t));
}
} 然后,确定一个UIDLTransformerType,
transformer =
this.transformerFactory.getTransformer(transformerType); 建立
// Create UIDL writer
WebPaintTarget paintTarget =
transformer.getPaintTarget(variableMap); 将数据更改后的window中的部件,形成xml stream
// Paint window
window.paint(paintTarget);
paintTarget.close(); 最后转换输出
transformer.transform(out); 全部结束
posted on 2005-08-05 20:14
staunch 阅读(221)
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