How set up Spring Boot to run HTTPS / HTTP ports

The currently accepted answer works perfectly but needs some adaption if you want it to work with Spring Boot 2.0.0 and onwards:

@Component
public class HttpServer {
  @Bean
  public ServletWebServerFactory servletContainer(@Value("${server.http.port}") int httpPort) {
      Connector connector = new Connector(TomcatServletWebServerFactory.DEFAULT_PROTOCOL);
      connector.setPort(httpPort);

      TomcatServletWebServerFactory tomcat = new TomcatServletWebServerFactory();
      tomcat.addAdditionalTomcatConnectors(connector);
      return tomcat;
  }
}

---

or the Kotlin version:

@Component
class HttpServer {
  @Bean
  fun servletContainer(@Value("\${server.http.port}") httpPort: Int): ServletWebServerFactory {
    val connector = Connector(TomcatServletWebServerFactory.DEFAULT_PROTOCOL)
    connector.setPort(httpPort)

    val tomcat = TomcatServletWebServerFactory()
    tomcat.addAdditionalTomcatConnectors(connector)
    return tomcat
  }
}