xiang哥，我那个阿里云配置tomcat的时候可以成功启动，但是公网ip就是访问不到。网上说的修改环境变量，关闭防火墙也都试了，也把云盘格式化试过低版本的jdk和tomcat，但是一直都是到最后一步就是访问不到。。而且可以正常启动，心态崩了。。请问有什么好的建议么

[root@iZeg2e98vu9e6kZ bin]# java -version
java version "11.0.3" 2019-04-16 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.3+12-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.3+12-LTS, mixed mode)

[root@iZeg2e98vu9e6kZ ~]# sh apache-tomcat-9.0.20/bin/startup.sh 
Using CATALINA_BASE:   /root/apache-tomcat-9.0.20
Using CATALINA_HOME:   /root/apache-tomcat-9.0.20
Using CATALINA_TMPDIR: /root/apache-tomcat-9.0.20/temp
Using JRE_HOME:        /usr/java/jdk-11.0.3
Using CLASSPATH:       /root/apache-tomcat-9.0.20/bin/bootstrap.jar:/root/apache-tomcat-9.0.20/bin/tomcat-juli.jar
Tomcat started.
[root@iZeg2e98vu9e6kZ ~]# sh apache-tomcat-9.0.20/bin/shutdown.sh 
Using CATALINA_BASE:   /root/apache-tomcat-9.0.20
Using CATALINA_HOME:   /root/apache-tomcat-9.0.20
Using CATALINA_TMPDIR: /root/apache-tomcat-9.0.20/temp
Using JRE_HOME:        /usr/java/jdk-11.0.3
Using CLASSPATH:       /root/apache-tomcat-9.0.20/bin/bootstrap.jar:/root/apache-tomcat-9.0.20/bin/tomcat-juli.jar
NOTE: Picked up JDK_JAVA_OPTIONS:  --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.io=ALL-UNNAMED --add-opens=java.rmi/sun.rmi.transport=ALL-UNNAMED
[root@iZeg2e98vu9e6kZ ~]#