InetAddress.getLocalHostgetHostAddress返回127.0.1.1 [重复]

如何解决InetAddress.getLocalHostgetHostAddress返回127.0.1.1 [重复]

您将需要使用NetworkInterface枚举网络接口。InetAddress.getLocalHost()总是返回环回。这并不能解释为什么得到127.0.1.1而不是127.0.0.1的原因，但是由于该方法没有执行您要尝试执行的操作，因此它似乎没有特别的意义。请参阅：http ://docs.oracle.com/javase/6/docs/api/java/net/NetworkInterface.html#getInetAddresses（）

解决方法

我的问题类似于这个问题。我想获取机器的真实IP（不是127.0.0.1），但是很奇怪，Ubuntu中的以下代码返回了127.0.1.1。

InetAddress.getLocalHost().getHostAddress()

以下是我的完整代码，最初在此处发布在SO中

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ifconfig在我的Ubuntu机器上则给出以下输出

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，因为我从未更新过此文件）

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

如何获取我的机器的真实IP（不是127.0.0.1）？我只在寻找IPv4地址，不包括127.0.0.0/8 subnet