在mac 下查看端口占用状况并杀死该进程，tomcat启动失败

学习 j2ee 时，在 eclipse 里总会碰到 Tomcat 没法启动，碰到以下报错： web Port required by Tomcat v8.0 Server at localhost is already in use. The server may already be running in another process, or a system process may be

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