Server.java

package io.vertx.example.web.cookie;

import io.vertx.core.AbstractVerticle;
import io.vertx.example.util.Runner;
import io.vertx.ext.web.Cookie;
import io.vertx.ext.web.Router;
import io.vertx.ext.web.handler.CookieHandler;
import io.vertx.ext.web.handler.StaticHandler;

/*
 * @author <a href="mailto:pmlopes@gmail.com">Paulo Lopes</a>
 */
public class Server extends AbstractVerticle {

  // Convenience method so you can run it in your IDE
  public static void main(String[] args) {
    Runner.runExample(Server.class);
  }

  @Override
  public void start() throws Exception {

    Router router = Router.router(vertx);

    // This cookie handler will be called for all routes
    router.route().handler(CookieHandler.create());

    // on every path increment the counter
    router.route().handler(ctx -> {
      Cookie someCookie = ctx.getCookie("visits");

      long visits = 0;
      if (someCookie != null) {
        String cookieValue = someCookie.getValue();
        try {
          visits = Long.parseLong(cookieValue);
        } catch (NumberFormatException e) {
          visits = 0l;
        }
      }

      // increment the tracking
      visits++;

      // Add a cookie - this will get written back in the response automatically
      ctx.addCookie(Cookie.cookie("visits", "" + visits));

      ctx.next();
    });

    // Serve the static resources
    router.route().handler(StaticHandler.create());

    vertx.createHttpServer().requestHandler(router::accept).listen(8080);
  }
}