Eclipse启动Tomcat错误：

Several ports (8080, 8009) required by Tomcat v6.0 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).

可以判断8080、8009端口已经被占用，通过以下方法，找出被哪个进程占用：

在命令提示符下，输入netstat -aon | findstr 8080

获得该端口被PID为848的进程占用

输入tasklist |findstr 848:

可以获得当前端口被javaw.exe占用

继续输入taskkill -F -IM javaw.exe或taskkill /pid 848 /F

结束该进程

再次在eclipse中启动tomcat正常

感谢@lovemu2016分享，仅供自己学习解决问题。