Several ports (8005, 8080, 8009) required by Tomcat v9.0 Server
Several ports (8005, 8080, 8009) required by Tomcat v9.0 Server at localhost are 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).
端口被占用了！
解决方法就是要去把占用了端口的工程关掉：
开始->运行->cmd管理员运行->输入 netstat -ano，回车，UDP旁边的一列为IP，找到8080，然后找到对应最后一列的PID
打开任务管理器---服务---关闭相应的PID的进程，重启eclipse，run就行了