java.net.InetAddress.getLocalHost()

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