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2024-02-03 09:00:05

使用Java获取当前机器的IP地址

我正在尝试开发一个系统，其中有不同的节点运行在不同的系统或在同一系统的不同端口上。

现在，所有节点都创建了一个套接字，将目标IP作为称为引导节点的特殊节点的IP。然后，节点创建自己的ServerSocket并开始侦听连接。

引导节点维护一个节点列表，并在查询时返回它们。

现在我需要的是节点必须将其IP注册到引导节点。我尝试使用cli.getInetAddress()一旦客户端连接到引导节点的ServerSocket，但这不起作用。

我需要客户端注册其PPP IP，如果可用; 否则，局域网IP(如果可用); 否则，它必须注册127.0.0.1，假设它是同一台计算机。

使用代码:

System.out.println(Inet4Address.getLocalHost().getHostAddress());

or

System.out.println(InetAddress.getLocalHost().getHostAddress());

我的PPP连接IP地址是:117.204.44.192，但上面返回我192.168.1.2

EDIT

我正在使用以下代码:

Enumeration e = NetworkInterface.getNetworkInterfaces();
while(e.hasMoreElements())
{
    NetworkInterface n = (NetworkInterface) e.nextElement();
    Enumeration ee = n.getInetAddresses();
    while (ee.hasMoreElements())
    {
        InetAddress i = (InetAddress) ee.nextElement();
        System.out.println(i.getHostAddress());
    }
}

我能够获得所有网络接口相关的所有IP地址，但我如何区分它们?这是我得到的输出:

127.0.0.1
192.168.1.2
192.168.56.1
117.204.44.19

当前回答

因为我的系统(像许多其他系统一样)有各种网络接口。inetaddress . getlocalhost()或Inet4Address.getLocalHost()只是返回一个我不需要的网络接口。 因此，我不得不使用这种幼稚的方法。

InetAddress[] allAddresses = Inet4Address.getAllByName("YourComputerHostName");
        InetAddress desiredAddress;
        //In order to find the desired Ip to be routed by other modules (WiFi adapter)
        for (InetAddress address :
                allAddresses) {
            if (address.getHostAddress().startsWith("192.168.2")) {
                desiredAddress = address;
            }
        }
// Use the desired address for whatever purpose.

只是要注意，在这种方法中，我已经知道我想要的IP地址在192.168.2子网中。

2020-04-10 00:45:27

其他回答

使用InetAddress.getLocalHost()获取本地地址

import java.net.InetAddress;

try {
  InetAddress addr = InetAddress.getLocalHost();            
  System.out.println(addr.getHostAddress());
} catch (UnknownHostException e) {
}
2012-02-28 12:32:06

你的计算机可以有多个网络接口，每个网络接口有多个inetaddress。如果过滤掉任何本地地址，则提醒的地址是非本地地址，其中可以有一个、没有或多个。

不幸的是，Java中的网络API仍然使用(旧的)枚举而不是迭代器和流，我们可以通过将它们包装为流来进行对抗。所以我们要做的就是

所有网络接口及其地址的流，以及 过滤掉本地的

代码:

private Stream<InetAddress> getNonLocalIpAddresses() throws IOException {
    return enumerationAsStream(NetworkInterface.getNetworkInterfaces())
        .flatMap(networkInterface -> enumerationAsStream(networkInterface.getInetAddresses()))
        .filter(inetAddress -> !inetAddress.isAnyLocalAddress())
        .filter(inetAddress -> !inetAddress.isSiteLocalAddress())
        .filter(inetAddress -> !inetAddress.isLoopbackAddress())
        .filter(inetAddress -> !inetAddress.isLinkLocalAddress());
}

在我的机器上，这目前返回两个IPv6地址。

要获得这些inetaddress中的第一个:

private String getMyIp() throws IOException {
    return getNonLocalIpAddresses()
        .map(InetAddress::getHostAddress)
        .findFirst()
        .orElseThrow(NoSuchElementException::new);
}

将枚举包装为流的方法:

public static <T> Stream<T> enumerationAsStream(Enumeration<T> e) {
    return StreamSupport.stream(
        Spliterators.spliteratorUnknownSize(
            new Iterator<>() {
                public T next() { return e.nextElement();  }
                public boolean hasNext() { return e.hasMoreElements(); }
            }, Spliterator.ORDERED), false);
}
2021-12-23 14:36:36

如果您的机器是网络的一部分，那么它将获取您的网络的IP地址

try {
    System.out.println(InetAddress.getLocalHost().getHostAddress());
} catch (UnknownHostException e) {
    e.printStackTrace();
}
2019-07-10 20:11:05

这是上面接受的答案的一个工作示例! 这个NetIdentity类将存储内部主机ip和本地环回。如果你在一个基于DNS的服务器上，如上所述，你可能需要添加更多的检查，或者可能进入配置文件路由。

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Enumeration;

/**
 * Class that allows a device to identify itself on the INTRANET.
 * 
 * @author Decoded4620 2016
 */
public class NetIdentity {

    private String loopbackHost = "";
    private String host = "";

    private String loopbackIp = "";
    private String ip = "";
    public NetIdentity(){

        try{
            Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();

            while(interfaces.hasMoreElements()){
                NetworkInterface i = interfaces.nextElement();
                if(i != null){
                    Enumeration<InetAddress> addresses = i.getInetAddresses();
                    System.out.println(i.getDisplayName());
                    while(addresses.hasMoreElements()){
                        InetAddress address = addresses.nextElement();
                        String hostAddr = address.getHostAddress();

                        // local loopback
                        if(hostAddr.indexOf("127.") == 0 ){
                            this.loopbackIp = address.getHostAddress();
                            this.loopbackHost = address.getHostName();
                        }

                        // internal ip addresses (behind this router)
                        if( hostAddr.indexOf("192.168") == 0 || 
                                hostAddr.indexOf("10.") == 0 || 
                                hostAddr.indexOf("172.16") == 0 ){
                            this.host = address.getHostName();
                            this.ip = address.getHostAddress();
                        }


                        System.out.println("\t\t-" + address.getHostName() + ":" + address.getHostAddress() + " - "+ address.getAddress());
                    }
                }
            }
        }
        catch(SocketException e){

        }
        try{
            InetAddress loopbackIpAddress = InetAddress.getLocalHost();
            this.loopbackIp = loopbackIpAddress.getHostName();
            System.out.println("LOCALHOST: " + loopbackIp);
        }
        catch(UnknownHostException e){
            System.err.println("ERR: " + e.toString());
        }
    }

    public String getLoopbackHost(){
        return loopbackHost;
    }

    public String getHost(){
        return host;
    }
    public String getIp(){
        return ip;
    }
    public String getLoopbackIp(){
        return loopbackIp;
    }
}

当我运行这段代码时，我实际上得到了这样的打印结果:

    Software Loopback Interface 1
        -127.0.0.1:127.0.0.1 - [B@19e1023e
        -0:0:0:0:0:0:0:1:0:0:0:0:0:0:0:1 - [B@7cef4e59
Broadcom 802.11ac Network Adapter
        -VIKING.yourisp.com:192.168.1.142 - [B@64b8f8f4
        -fe80:0:0:0:81fa:31d:21c9:85cd%wlan0:fe80:0:0:0:81fa:31d:21c9:85cd%wlan0 - [B@2db0f6b2
Microsoft Kernel Debug Network Adapter
Intel Edison USB RNDIS Device
Driver for user-mode network applications
Cisco Systems VPN Adapter for 64-bit Windows
VirtualBox Host-Only Ethernet Adapter
        -VIKING:192.168.56.1 - [B@3cd1f1c8
        -VIKING:fe80:0:0:0:d599:3cf0:5462:cb7%eth4 - [B@3a4afd8d
LogMeIn Hamachi Virtual Ethernet Adapter
        -VIKING:25.113.118.39 - [B@1996cd68
        -VIKING:2620:9b:0:0:0:0:1971:7627 - [B@3339ad8e
        -VIKING:fe80:0:0:0:51bf:994d:4656:8486%eth5 - [B@555590
Bluetooth Device (Personal Area Network)
        -fe80:0:0:0:4c56:8009:2bca:e16b%eth6:fe80:0:0:0:4c56:8009:2bca:e16b%eth6 - [B@3c679bde
Bluetooth Device (RFCOMM Protocol TDI)
Intel(R) Ethernet Connection (2) I218-V
        -fe80:0:0:0:4093:d169:536c:7c7c%eth7:fe80:0:0:0:4093:d169:536c:7c7c%eth7 - [B@16b4a017
Microsoft Wi-Fi Direct Virtual Adapter
        -fe80:0:0:0:103e:cdf0:c0ac:1751%wlan1:fe80:0:0:0:103e:cdf0:c0ac:1751%wlan1 - [B@8807e25
VirtualBox Host-Only Ethernet Adapter-HHD Software NDIS 6.0 Filter Driver-0000
VirtualBox Host-Only Ethernet Adapter-WFP Native MAC Layer LightWeight Filter-0000
VirtualBox Host-Only Ethernet Adapter-HHD Software NDIS 6.0 Filter Driver-0001
VirtualBox Host-Only Ethernet Adapter-HHD Software NDIS 6.0 Filter Driver-0002
VirtualBox Host-Only Ethernet Adapter-VirtualBox NDIS Light-Weight Filter-0000
VirtualBox Host-Only Ethernet Adapter-HHD Software NDIS 6.0 Filter Driver-0003
VirtualBox Host-Only Ethernet Adapter-QoS Packet Scheduler-0000
VirtualBox Host-Only Ethernet Adapter-HHD Software NDIS 6.0 Filter Driver-0004
VirtualBox Host-Only Ethernet Adapter-WFP 802.3 MAC Layer LightWeight Filter-0000
VirtualBox Host-Only Ethernet Adapter-HHD Software NDIS 6.0 Filter Driver-0005
Intel(R) Ethernet Connection (2) I218-V-HHD Software NDIS 6.0 Filter Driver-0000
Intel(R) Ethernet Connection (2) I218-V-WFP Native MAC Layer LightWeight Filter-0000
Intel(R) Ethernet Connection (2) I218-V-HHD Software NDIS 6.0 Filter Driver-0001
Intel(R) Ethernet Connection (2) I218-V-Shrew Soft Lightweight Filter-0000
Intel(R) Ethernet Connection (2) I218-V-HHD Software NDIS 6.0 Filter Driver-0002
Intel(R) Ethernet Connection (2) I218-V-VirtualBox NDIS Light-Weight Filter-0000
Intel(R) Ethernet Connection (2) I218-V-HHD Software NDIS 6.0 Filter Driver-0003
Intel(R) Ethernet Connection (2) I218-V-QoS Packet Scheduler-0000
Intel(R) Ethernet Connection (2) I218-V-HHD Software NDIS 6.0 Filter Driver-0004
Intel(R) Ethernet Connection (2) I218-V-WFP 802.3 MAC Layer LightWeight Filter-0000
Intel(R) Ethernet Connection (2) I218-V-HHD Software NDIS 6.0 Filter Driver-0005
Broadcom 802.11ac Network Adapter-WFP Native MAC Layer LightWeight Filter-0000
Broadcom 802.11ac Network Adapter-Virtual WiFi Filter Driver-0000
Broadcom 802.11ac Network Adapter-Native WiFi Filter Driver-0000
Broadcom 802.11ac Network Adapter-HHD Software NDIS 6.0 Filter Driver-0003
Broadcom 802.11ac Network Adapter-Shrew Soft Lightweight Filter-0000
Broadcom 802.11ac Network Adapter-HHD Software NDIS 6.0 Filter Driver-0004
Broadcom 802.11ac Network Adapter-VirtualBox NDIS Light-Weight Filter-0000
Broadcom 802.11ac Network Adapter-HHD Software NDIS 6.0 Filter Driver-0005
Broadcom 802.11ac Network Adapter-QoS Packet Scheduler-0000
Broadcom 802.11ac Network Adapter-HHD Software NDIS 6.0 Filter Driver-0006
Broadcom 802.11ac Network Adapter-WFP 802.3 MAC Layer LightWeight Filter-0000
Broadcom 802.11ac Network Adapter-HHD Software NDIS 6.0 Filter Driver-0007
Microsoft Wi-Fi Direct Virtual Adapter-WFP Native MAC Layer LightWeight Filter-0000
Microsoft Wi-Fi Direct Virtual Adapter-Native WiFi Filter Driver-0000
Microsoft Wi-Fi Direct Virtual Adapter-HHD Software NDIS 6.0 Filter Driver-0002
Microsoft Wi-Fi Direct Virtual Adapter-Shrew Soft Lightweight Filter-0000
Microsoft Wi-Fi Direct Virtual Adapter-HHD Software NDIS 6.0 Filter Driver-0003
Microsoft Wi-Fi Direct Virtual Adapter-VirtualBox NDIS Light-Weight Filter-0000
Microsoft Wi-Fi Direct Virtual Adapter-HHD Software NDIS 6.0 Filter Driver-0004
Microsoft Wi-Fi Direct Virtual Adapter-QoS Packet Scheduler-0000
Microsoft Wi-Fi Direct Virtual Adapter-HHD Software NDIS 6.0 Filter Driver-0005
Microsoft Wi-Fi Direct Virtual Adapter-WFP 802.3 MAC Layer LightWeight Filter-0000
Microsoft Wi-Fi Direct Virtual Adapter-HHD Software NDIS 6.0 Filter Driver-0006

为了我的使用，我设置了一个Upnp服务器，它有助于理解我正在寻找的“模式”。返回的对象包括以太网适配器、网络适配器、虚拟网络适配器、驱动程序和VPN客户端适配器。也不是所有东西都有地址。所以你会想要跳过那些不需要的接口对象。

您还可以将此添加到当前NetworkInterface i的循环中

while(interfaces.hasMoreElements()){
    Enumeration<InetAddress> addresses = i.getInetAddresses();
    System.out.println(i.getDisplayName());
    System.out.println("\t- name:" + i.getName());
    System.out.println("\t- idx:" + i.getIndex());
    System.out.println("\t- max trans unit (MTU):" + i.getMTU());
    System.out.println("\t- is loopback:" + i.isLoopback());
    System.out.println("\t- is PPP:" + i.isPointToPoint());
    System.out.println("\t- isUp:" + i.isUp());
    System.out.println("\t- isVirtual:" + i.isVirtual());
    System.out.println("\t- supportsMulticast:" + i.supportsMulticast());
}

你会在输出中看到类似这样的信息:

Software Loopback Interface 1
    - name:lo
    - idx:1
    - max trans unit (MTU):-1
    - is loopback:true
    - is PPP:false
    - isUp:true
    - isVirtual:false
    - supportsMulticast:true
        -ADRESS: [127.0.0.1(VIKING-192.168.56.1)]127.0.0.1:127.0.0.1 - [B@19e1023e
        -ADRESS: [0:0:0:0:0:0:0:1(VIKING-192.168.56.1)]0:0:0:0:0:0:0:1:0:0:0:0:0:0:0:1 - [B@7cef4e59
Broadcom 802.11ac Network Adapter
    - name:wlan0
    - idx:2
    - max trans unit (MTU):1500
    - is loopback:false
    - is PPP:false
    - isUp:true
    - isVirtual:false
    - supportsMulticast:true
        -ADRESS: [VIKING.monkeybrains.net(VIKING-192.168.56.1)]VIKING.monkeybrains.net:192.168.1.142 - [B@64b8f8f4
        -ADRESS: [fe80:0:0:0:81fa:31d:21c9:85cd%wlan0(VIKING-192.168.56.1)]fe80:0:0:0:81fa:31d:21c9:85cd%wlan0:fe80:0:0:0:81fa:31d:21c9:85cd%wlan0 - [B@2db0f6b2
Microsoft Kernel Debug Network Adapter
    - name:eth0
    - idx:3
    - max trans unit (MTU):-1
    - is loopback:false
    - is PPP:false
    - isUp:false
    - isVirtual:false
    - supportsMulticast:true
2016-02-19 23:00:46 
private static InetAddress getLocalAddress(){
        try {
            Enumeration<NetworkInterface> b = NetworkInterface.getNetworkInterfaces();
            while( b.hasMoreElements()){
                for ( InterfaceAddress f : b.nextElement().getInterfaceAddresses())
                    if ( f.getAddress().isSiteLocalAddress())
                        return f.getAddress();
            }
        } catch (SocketException e) {
            e.printStackTrace();
        }
        return null;
    }
2014-11-03 06:52:38

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