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

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;
    }

其他回答

首先导入类

import java.net.InetAddress;

在课堂上

  InetAddress iAddress = InetAddress.getLocalHost();
  String currentIp = iAddress.getHostAddress();
  System.out.println("Current IP address : " +currentIp); //gives only host address

scala中的示例(在sbt文件中有用):

  import collection.JavaConverters._
  import java.net._

  def getIpAddress: String = {

    val enumeration = NetworkInterface.getNetworkInterfaces.asScala.toSeq

    val ipAddresses = enumeration.flatMap(p =>
      p.getInetAddresses.asScala.toSeq
    )

    val address = ipAddresses.find { address =>
      val host = address.getHostAddress
      host.contains(".") && !address.isLoopbackAddress
    }.getOrElse(InetAddress.getLocalHost)

    address.getHostAddress
  }

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。

一个Kotlin的例子,至少在Windows上可以工作,即使我的VPN是打开的。 (当VPN打开时,其他方法似乎失败了) 它只需要查找一次计算机的IP地址。从那时起,始终可以从存储的适配器信息中找到IP地址。

import java.net.NetworkInterface
import java.util.prefs.Preferences

class WindowsIP {
    companion object {
        val prefs = Preferences.userNodeForPackage(this::class.java)  //Get the current IP address for the wifi adapter whose information
        // has been stored by calling findWifiAdapter(currentIp) with the known current IP (from wifi properties or whatever)
        fun getIpAddress(): String {
            val wlanName = prefs.get("WlanName", "")
            val wlanDisplName = prefs.get("WlanDisplName", "")
            val addrCnt = prefs.getInt("wlanAddrCount", 0)
            val nis = NetworkInterface.getNetworkInterfaces()
            for (ni in nis) {
                if (ni.name == wlanName && ni.displayName == wlanDisplName) {
                    var count = 0
                    for (addr in ni.inetAddresses) {
                        if (count++ == addrCnt) {
                            return addr.hostAddress
                        }
                    }
                }
            }
            return "Unknown. Call findWifiAdapter() with current IP address"
        }

        fun findWifiAdapter(currentIP: String) {  //Find the wifi adapter using the current IP address and store the information
                val nis = NetworkInterface.getNetworkInterfaces()
                for(ni in nis) {
                    var count = 0;
                    for(adr in ni.inetAddresses) {
                        if(adr.hostAddress == currentIP) {
                            prefs.put("WlanName", ni.name)
                            prefs.put("WlanDisplName", ni.displayName)
                            prefs.putInt("wlanAddrCount", count)  //Probably always zero?
                        }
                        ++count
                    }
                }
        }
    }
}

你可以使用java的InetAddress类来实现这个目的。

InetAddress IP=InetAddress.getLocalHost();
System.out.println("IP of my system is := "+IP.getHostAddress());

my system = IP的输出是:= 10.100.98.228

getHostAddress()返回

以文本形式返回IP地址字符串。

或者你也可以这样做

InetAddress IP=InetAddress.getLocalHost();
System.out.println(IP.toString());

我的系统Output = IP为:= RanRag-PC/10.100.98.228