QtWebApp contains a HTTP web server library and an example program. With the libraries in this package, you can write your own web servers easily. The API is similar to Java servlets.
a basic servlet:
Quote:
void MyController::service(HttpRequest& request, HttpResponse& response) {
// Get some request parameters
QByteArray path=request.getPath();
QByteArray username=request.getParameter("username");
// set some headers
response.setHeader("Content-Type", "text/html; charset=ISO-8859-1");
response.setCookie(HttpCookie("myCookie","hello",600));
// generate response
response.write("*html**body*");
response.write("Hello ");
response.write(username);
response.write("*body**html*");
}
(replace the * by angle brackets)
main program:
Quote:int main(int argc, char *argv[]) {
QCoreApplication* app=new QCoreApplication(argc,argv);
QSettings* settings=new QSettings("etc/configfile.ini",QSettings::IniFormat,app);
MyController* controller=new MyController(app);
HttpListener* listener=new HttpListener(settings,controller,app);
return app->exec();
}
configfile.ini:
Quote:port=8080
minThreads=1
maxThreads=10
cleanupInterval=1000
readTimeout=60000
maxRequestSize=16000
maxMultiPartSize=1000000
The HTTP server processes incoming requests in multiple threads, that are managed in a dynamic pool. It supports persistent connections, sessions, and file-uploads. The example above answers all requests in a single controller. However real applications would branch to more specific classes depending on the requested path, as the demo application does.
A simple multi-language capable template engine is included, that fills placeholders in HTML files with dynamic values at runtime. The template engine also supports conditional output and loops. Other larger template engines, such as ClearSilver, may be used as an alternative.
The logger plugs into QT and redirects log messages from qDebug(...) to qFatal(...) to files, while they are enriched with additional attributes like timestamp, thread ID, session ID and some more. The logger can filter by log-level as usual, but it can also keep unwritten messages in a memory buffer per thread which is written when an error occurs. Thus the logfiles are kept small and clean during normal operation but contain much more detailled informations about what happened before errors. Changes to the settings file become active automatically without program restart.
The included QtService library from Nokia allows you to start the application as a Linux Daemon or Windows Service.
