java - InetAddress.getLocalHost().getHostName() 抛出 UnknownHostException

Question

我正在尝试从运行它的服务器上获取主机名。

Java 代码:

import java.net.InetAddress; 
System.out.println("Host Name: " + InetAddress.getLocalHost().getHostName());
System.exit(0);

输出:

java.net.UnknownHostException: ThinkPad-Edge-E430: ThinkPad-Edge-E430: Name or service not known
at java.net.InetAddress.getLocalHost(InetAddress.java:1473)
at MailQ.main(MailQ.java:45)
Caused by: java.net.UnknownHostException: ThinkPad-Edge-E430: Name or service not known
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:901)
at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1293)
at java.net.InetAddress.getLocalHost(InetAddress.java:1469)
... 1 more

主持人:

127.0.0.1   localhost #admin.local.com
#127.0.1.1  ThinkPad-Edge-E430
192.168.81.238 admin.local.com
# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

我找不到这里的问题是什么。有人可以帮我吗？

Answer 1

你可以检查:-

System.getProperty("os.name");

然后使用该操作系统的正确环境变量，即

Windows

System.getenv("COMPUTERNAME");

Linux

System.getenv("HOSTNAME");

这种方法的问题在于，当您开始在不太常见的操作系统上运行时，您可能必须挖掘环境变量。

对于失败的原因，我相信您可以通过查看这篇文章找到答案:-

Recommended way to get hostname in Java

Any attempt to determine the hostname by an IP address like this

InetAddress.getLocalHost().getHostName()

is bound to fail in some circumstances: