Tomcat启动报错Port 80 required by Tomcat v7.0 Server at localhost is already in use. The server may alre

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报错内容：

Port 80 required by Tomcat v7.0 Server at localhost is 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).

 意思为：80端口被占用。

方式一：

stop Tomcat然后重启，可能就不会报错了。

方式二：

win + R输入cmd，进入DOS，输入：

netstat -ano|findstr 80

然后用命令杀死或者进入任务管理器中找到对应PID,结束进程即可。