报错如下，可知端口被占用
二、解决方法
1、查询被占用端口号对应的tcp号
正在占用的端口号：netstat -ano|findstr 30000，此时会显示端口8081对应的tcp号
2、杀死进程
输入命令 taskkill /f /t /im 5680，终止了8081端口的运行进程
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