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programmieren:java:webserver:jetty:start [2017/05/13 09:03] – martinprogrammieren:java:webserver:jetty:start [2021/12/29 11:40] (aktuell) – Externe Bearbeitung 127.0.0.1
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 +====== Configuring jetty webserver in embedded mode ======
 +Here's how to configure [[http://www.eclipse.org/jetty/|Jetty Webserver]] in embedded mode to obtain
 +  * Servlet holder
 +  * memory based sessions
 +  * cookie based session tracking
 +  * server for static files
 +  * common filter (class Authenticationfilter, see below) for servlets and static files 
  
 +<code java>
 +import org.eclipse.jetty.server.Server;
 +import org.eclipse.jetty.server.session.SessionHandler;
 +import org.eclipse.jetty.servlet.DefaultServlet;
 +import org.eclipse.jetty.servlet.ServletContextHandler;
 +import org.eclipse.jetty.servlet.ServletHolder;
 +
 +import javax.servlet.DispatcherType;
 +import javax.servlet.SessionTrackingMode;
 +
 +[...]
 +
 + private static void startServer(Configuration config) throws Exception {
 +
 + Server server = new Server(8080);
 +
 + //Init servlet context
 + ServletContextHandler context = new ServletContextHandler(
 + ServletContextHandler.SESSIONS);
 + context.setContextPath("/");
 + context.addFilter(AuthenticationFilter.class, "/*",
 + EnumSet.of(DispatcherType.REQUEST));
 +
 +
 + //Memory based session handling
 + SessionHandler sessionHandler = new SessionHandler();
 + sessionHandler.setSessionTrackingModes(EnumSet
 + .of(SessionTrackingMode.COOKIE));
 +
 + context.setSessionHandler(sessionHandler);
 +
 + // if needed use this to set Attributes on servlet context
 + // context.setAttribute(CONNECTION_POOL, connectionPool);
 +
 + // Jetty should also serve static files
 + ServletHolder staticHolder = new ServletHolder(new DefaultServlet());
 + staticHolder.setInitParameter("resourceBase", "WebContent"); // static content is in Directory "WebContent"
 + staticHolder.setInitParameter("pathInfoOnly", "true");
 + staticHolder.setInitParameter("dirAllowed", "false");
 + // register staticHolder with same context as servlets so that 
 + // Authenticationfilter is also invoked
 + context.addServlet(staticHolder, "/*");
 +
 +                // I have plugins which have their own static files. 
 +                // Here's how i setup their webcontent directories:
 + for (Plugin plugin : ModuleManager.getPlugins()) {
 +
 + staticHolder = new ServletHolder(new DefaultServlet());
 + staticHolder.setInitParameter("resourceBase", plugin
 + .getWebContentDir().toAbsolutePath().toString());
 + staticHolder.setInitParameter("pathInfoOnly", "true");
 + staticHolder.setInitParameter("dirAllowed", "false");
 + context.addServlet(staticHolder,
 + "/modules/" + plugin.getIdentifier() + "/*");
 +
 + }
 +
 + // Examples for registering servlets.
 + context.addServlet(LoginServlet.class, "/login/*");
 + context.addServlet(MainFrameServlet.class, "/main/*"); 
 + context.addServlet(ProgressServlet.class, "/progress");
 + context.addServlet(DefinitionsServlet.class, "/definitions");
 + context.addServlet(HtmlFragmentServlet.class, "/fragments/*");
 +
 + // register servlets of modules and plugins
 + ModuleManager.addServlets(context);
 +
 + // Add default servlet for 404 Error messages
 + context.addServlet(DefaultServlet.class, "/");
 +
 + server.setHandler(context);
 +
 + server.start();
 + server.join();
 +
 + }
 +</code>
 +
 +Here's the sceleton of my Authenticationfilter class:
 +
 +<code java>
 +import javax.servlet.Filter;
 +import javax.servlet.FilterChain;
 +import javax.servlet.FilterConfig;
 +import javax.servlet.ServletException;
 +import javax.servlet.ServletRequest;
 +import javax.servlet.ServletResponse;
 +import javax.servlet.http.HttpServletRequest;
 +import javax.servlet.http.HttpServletResponse;
 +import javax.servlet.http.HttpSession;
 +
 +import org.slf4j.Logger;
 +import org.slf4j.LoggerFactory;
 +
 +
 +public class AuthenticationFilter implements Filter {
 +
 + @Override
 + public void destroy() {
 +
 + }
 +
 + @Override
 + public void doFilter(ServletRequest req, ServletResponse resp,
 + FilterChain chain) throws IOException, ServletException {
 +
 + long time = System.currentTimeMillis();
 +
 + // Before servlet
 + HttpServletRequest request = (HttpServletRequest) req;
 + HttpServletResponse response = (HttpServletResponse) resp;
 +
 + boolean allowedRequest = false;
 +
 + String pathInfo = request.getPathInfo();
 + String servletPath = request.getServletPath();
 + // System.out.println("pathInfo:" + pathInfo);
 +
 +                // static files in folder /public and servlet with path /login are served without valid session:
 + if (pathInfo != null && pathInfo.startsWith("/public/")
 + || servletPath != null && (servletPath.equals("/login"))) {
 + allowedRequest = true;
 + } else {
 +
 + HttpSession session = request.getSession();
 + User user = (User) session.getAttribute("user");
 +
 +                        allowedRequest = ... test if user has valid credentials ...
 +                    
 + }
 +
 + if (allowedRequest) {
 + // Invoke servlet
 + chain.doFilter(request, response);
 +
 + time = System.currentTimeMillis() - time;
 + Logger logger = LoggerFactory.getLogger(AuthenticationFilter.class);
 + logger.info("Request " + request.getRequestURI() + ": " + time
 + + " ms");
 +
 + // After servlet
 + } else {
 + response.sendRedirect("/login");
 + }
 +
 + }
 +
 + @Override
 + public void init(FilterConfig arg0) throws ServletException {
 +
 + }
 +
 +}
 +
 +</code>

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