在mac 下查看端口占用狀況並殺死該進程，tomcat啓動失敗

學習 j2ee 時，在 eclipse 裏總會碰到 Tomcat 沒法啓動，碰到以下報錯： 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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