解决端口号占用问题：Web Server failed to start.Port 8002 was already in use.
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win+r打开cmd命令行窗口。
输入 netstat -ano ,查看启动的进程ID
发现8002端口号被占用的进程，最后一个数据是进程ID
杀死进程命令
taskkill /F /pid 4344
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