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java - InetAddress.getLocalHost().getHostAddress() 正在返回 127.0.1.1

转载 作者:太空狗 更新时间:2023-10-29 22:40:29 26 4
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我的问题类似于this问题 。我想获取我机器的真实 IP(不是 127.0.0.1),但奇怪的是,我的 Ubuntu 中的以下代码返回 127.0.1.1

InetAddress.getLocalHost().getHostAddress()

下面是我的完整代码,最初发布在 SO 中 here

public String getMachineIP() {
try {
String hostIP = InetAddress.getLocalHost().getHostAddress();
if (!hostIP.equals("127.0.0.1")) {
return hostIP;
}

/*
* Above method often returns "127.0.0.1", In this case we need to
* check all the available network interfaces
*/
Enumeration<NetworkInterface> nInterfaces = NetworkInterface
.getNetworkInterfaces();
while (nInterfaces.hasMoreElements()) {
Enumeration<InetAddress> inetAddresses = nInterfaces
.nextElement().getInetAddresses();
while (inetAddresses.hasMoreElements()) {
String address = inetAddresses.nextElement()
.getHostAddress();
if (!address.equals("127.0.0.1")) {
return address;
}
}
}
} catch (UnknownHostException e1) {
System.err.println("Error = " + e1.getMessage());
} catch (SocketException e1) {
System.err.println("Error = " + e1.getMessage());
}
return null;
}

上面的代码返回 127.0.1.1 而我的 Ubuntu 机器上的 ifconfig 给出以下输出

root@dell:~# ifconfig
eth0 Link encap:Ethernet HWaddr 00:21:70:b7:30:cd
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:28 Base address:0x6000

eth1 Link encap:Ethernet HWaddr 00:22:68:d3:02:b5
inet addr:192.168.2.112 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::222:68ff:fed3:2b5/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:23827 errors:0 dropped:0 overruns:0 frame:32515
TX packets:23200 errors:46 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:22027719 (22.0 MB) TX bytes:3778268 (3.7 MB)
Interrupt:19

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:402 errors:0 dropped:0 overruns:0 frame:0
TX packets:402 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:29197 (29.1 KB) TX bytes:29197 (29.1 KB)

我在主机文件中找到了 127.0.1.1 条目(对我来说很奇怪,因为我从未更新过这个文件)

root@dell:~# cat /etc/hosts
127.0.0.1 localhost
127.0.1.1 dell

# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

如何获取我机器的真实IP(不是127.0.0.1)?我只查找不包括 127.0.0.0/8 subnet

的 IPv4 地址

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