'Starting Tomcat v9.0 Server at localhost' has encountered a problem. Port 8080 required by Tomcat v9.0 Server at localhost is already in use. The server may already be running in another process, or a system process may be using the port. To start this server you will need to stop the other process or change the port number(s). 解決方法
查詢佔用埠號8080的命令：netstat -aon|findstr “8080”
然後去工作管理員，把相關的PID關閉即可。