错误信息：
InetAddress.getLocalHost().getHostName() took 5002 milliseconds to respond. Please verify your network configuration (macOS machines may need to add entries to /etc/hosts).
这个调用在新版的mac os中可能会耗时很久。
解决办法有两种：
1. 就是把本机的hostname 添加到 hosts 中，例如:
127.0.0.1 localhost 127.0.0.1 loulldeMacBook-Pro.local 255.255.255.255 broadcasthost ::1 localhost ::1 loulldeMacBook-Pro.local
2. 终端中执行
scutil --set HostName "localhost"
大致原因，获取本机地址，走到了DNS解析，DNS递归解析不到本机域名，耗时5s左右
转载：https://www.cnblogs.com/549294286/p/8515351.html