Spring Boot动态获取运行端口用于OAuth2实现的问题

我需要在OAuth2执行前动态获取应用运行端口，否则OAuth2无法正常连接。当前应用配置server.port=8000，启动日志显示Tomcat初始化端口为8000，但遇到两个问题：

• 实现WebServerFactoryCustomizer的CustomContainer类执行时机在OAuth2之前，但获取到的端口是8080（错误）；
• 实现ApplicationListener<ServletWebServerInitializedEvent>并添加@Order(Ordered.HIGHEST_PRECEDENCE)注解的PortDomain类能获取正确的8000端口，但该类执行时机仍晚于OAuth2，导致OAuth2连接失败。

启动日志 #

2023-01-12 17:14:31.767  INFO 2492 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8000 (http)
2023-01-12 17:14:31.777  INFO 2492 --- [  restartedMain] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2023-01-12 17:14:31.777  INFO 2492 --- [  restartedMain] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.68]
System 8080

CustomContainer类代码 #

@Component
public class CustomContainer  implements WebServerFactoryCustomizer<TomcatServletWebServerFactory> {

    @Override
    public void customize(TomcatServletWebServerFactory factory) {
        System.out.println("System " +factory.getWebServer().getPort());
    }
}

application.properties配置 #

server.port=8000

PortDomain类代码 #

@Component
@Order(Ordered.HIGHEST_PRECEDENCE)
@Slf4j
public class PortDomain  implements ApplicationListener<ServletWebServerInitializedEvent> {

        private static Integer port;

        private String domain = InetAddress.getLoopbackAddress().getHostName();


        @Override
        public void onApplicationEvent(ServletWebServerInitializedEvent event) {
            setPort(event.getWebServer().getPort());
            System.out.println("Check way "+event.getWebServer().getPort());
        }

        public static void setPort(Integer port) {
            PortDomain.port = port;
        }

        public String portDomain(){
            String protocolDomain = "http://"+domain+":"+port;
            log.info("UrlUtility protocolDomain{}",protocolDomain);
            return protocolDomain;
        }

}

内容的提问来源于stack exchange，提问作者Sard