InetAddress.getLocalHost().getHostName() 抛出 UnknownHostException

Question

我正在尝试从服务器上获取主机名运行。

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.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。有人能帮帮我吗？

Answer 1

您可以检查：-

System.getProperty("os.name");

然后为该操作系统使用正确的环境变量，即

Windows

System.getenv("COMPUTERNAME");

Linux

System.getenv("HOSTNAME");

这种方法的问题在于，当您在不太常见的操作系统上启动运行时，您可能需要挖掘环境变量。

关于失败的原因，我相信您可能通过查看此 post 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:

Answer 2

试试这个：

import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * @author Crunchify.com
 */

public class CrunchifyGetIPHostname {

    public static void main(String[] args) {

        InetAddress ip;
        String hostname;
        try {
            ip = InetAddress.getLocalHost();
            hostname = ip.getHostName();
            System.out.println("Your current IP address : " + ip);
            System.out.println("Your current Hostname : " + hostname);

        } catch (UnknownHostException e) {

            e.printStackTrace();
        }
    }
}

您在 http://www.browxy.com/

在线测试此代码

我从http://crunchify.com/how-to-get-server-ip-address-and-hostname-in-java/

那里拿走了它

InetAddress.getLocalHost().getHostName() 抛出 UnknownHostException

InetAddress.getLocalHost().getHostName() throws UnknownHostException

java

localhost