解决 Spring Cloud Consul 在 Tomcat 容器中服务注册问题

@Override
	public void onApplicationEvent(ApplicationEvent applicationEvent) {
		if (applicationEvent instanceof WebServerInitializedEvent) {
			WebServerInitializedEvent event = (WebServerInitializedEvent) applicationEvent;

			ApplicationContext context = event.getApplicationContext();
			if (context instanceof ConfigurableWebServerApplicationContext) {
				if ("management".equals(
						((ConfigurableWebServerApplicationContext) context).getServerNamespace())) {
					return;
				}
			}
			this.autoServiceRegistration.setPortIfNeeded(event.getWebServer().getPort());
			this.autoServiceRegistration.start();
		}
	}

  protected void finishRefresh() {
    super.finishRefresh();
    WebServer webServer = this.startWebServer();
	 // 这里在 内嵌Tomcat 启动后，webServer 不为 null ，发布 ServletWebServerInitializedEvent 事件，触发 ConsulAutoServiceRegistrationListener 注册服务
	// 这里在 Tomcat 容器启动服务 后，webServer 是 null 的，因此导致 ConsulAutoServiceRegistrationListener 接收不到对应的事件，从而无法服务注册
    if (webServer != null) {
      this.publishEvent(new ServletWebServerInitializedEvent(webServer, this));
    }
  }

import lombok.RequiredArgsConstructor;
import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.cloud.consul.ConditionalOnConsulEnabled;
import org.springframework.cloud.consul.discovery.ConsulDiscoveryProperties;
import org.springframework.cloud.consul.serviceregistry.ConsulAutoServiceRegistration;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;

/**
 * Spring Cloud 2.1 注册服务, 通过发布 {@link org.springframework.boot.web.context.WebServerInitializedEvent} 事件实现的, 参考 {@link
 * org.springframework.cloud.consul.serviceregistry.ConsulAutoServiceRegistrationListener}。
 *
 * <p>
 * 该事件仅在内嵌 Tomcat 中生效，参考 {@link org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext}, 而通过
 * Tomcat 容器启动服务时监听不到该事件。
 * </p>
 *
 * @author Sven Augustus
 */
@Component
@ConditionalOnConsulEnabled
@RequiredArgsConstructor
public class ConsulAutoServiceRegistrationInitializerListener implements ApplicationListener<ApplicationReadyEvent> {

  private final ConsulAutoServiceRegistration consulAutoServiceRegistration;
  private final ConsulDiscoveryProperties properties;

  @Override
  public void onApplicationEvent(ApplicationReadyEvent event) {
    consulAutoServiceRegistration.start();
  }

}