mac Tomcat v7.0 Server at localhost are already in use

The built-in Tomcat in Eclipse under mac reports an error at startup:

Several ports (8080, 8009) required by Tomcat v7.0 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).

Solution: 
Open a terminal and enter the following command

lsof -i :8080

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If your occupied port is not 8080, please modify the parameters in the command. 
The command outputs the following:

COMMAND   PID     USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
java    27132    kaige   41u  IPv6 0x9d80e4a27fc1081b      0t0  TCP *:http-alt (LISTEN)

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The process ID that occupies port 8080 on my Mac is 27132, so I will kill this process again

kill -9 27132

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Please modify the last parameter of this command according to your process ID

Then start Tomcat in Eclipse again, it can start normally!