Several ports (8005, 8080, 8009) required by Tomcat v8.0 Server at localhost are already in use

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).
eclipse运行web时出现上述报错，这是由于你已经在外面通过starup.bat打开了tomcat,而在eclipse中运行时会再一次通过server打开Tomcat，这就造成了上面端口被占用的发中生，解决方法就是找到Tomcat的文件夹下bin文件夹然后双击shutdown.bat关闭Tomcat后再在eclipse中运行即可。