如何在Spring Boot中内嵌Tomcat并启动

private void createEmbeddedServletContainer() { EmbeddedServletContainer localContainer = this.embeddedServletContainer; ServletContext localServletContext = getServletContext(); if (localContainer == null && localServletContext == null) {  EmbeddedServletContainerFactory containerFactory = getEmbeddedServletContainerFactory();  this.embeddedServletContainer = containerFactory   .getEmbeddedServletContainer(getSelfInitializer()); } else if (localServletContext != null) {  try {  getSelfInitializer().onStartup(localServletContext);  }  catch (ServletException ex) {  throw new ApplicationContextException("Cannot initialize servlet context",   ex);  } } initPropertySources(); }