Java获取我的IP地址

Question

我试图在Java中获取我的互联网IP地址，但我不断获取我的本地地址（即：127.0.0.1），当我的IP地址是192.168.0.xxx时，

我正在使用以下行：

InetAddress.getLocalHost().getHostAddress();

这似乎是获取IP地址的标准，但这不是我要找的。每个教程都说要使用这条线，所以我有点困惑。

谁能告诉我如何获得正确的 IP 地址？

---

我正在连接到 WiFi 的设备上运行，并且没有使用任何电缆。我正在使用 ifconfig inet addr 给出的 IP 连接到服务器，并且我希望获取设备的 inet addr。我可以检查服务器端套接字的 IP，但我认为如果设备（客户端）告诉服务器他期望其他设备连接哪个 IP，那就更好了。

Answer 1

    String ip;
    try {
        Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
        while (interfaces.hasMoreElements()) {
            NetworkInterface iface = interfaces.nextElement();
            // filters out 127.0.0.1 and inactive interfaces
            if (iface.isLoopback() || !iface.isUp())
                continue;

            Enumeration<InetAddress> addresses = iface.getInetAddresses();
            while(addresses.hasMoreElements()) {
                InetAddress addr = addresses.nextElement();
                ip = addr.getHostAddress();
                System.out.println(iface.getDisplayName() + " " + ip);
            }
        }
    } catch (SocketException e) {
        throw new RuntimeException(e);
    }

Answer 2

网络接口类包含所有相关方法，但请注意，不存在“我的 IP”之类的东西。一台机器可以有多个接口，每个接口可以有多个IP。

您可以在此类中列出所有这些，但从列表中选择哪个接口和 IP 取决于您究竟需要使用该 IP 做什么。

（InetAddress.getLocalHost() 不会咨询您的接口，它只是返回常量 127.0.0.1（对于 IPv4））

Answer 3

让我们询问 AWS

URL url = new URL("http://checkip.amazonaws.com/");
BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream()));
System.out.println(br.readLine());

编辑

在您投反对票之前，我很清楚这不是一个 java 解决方案。它是任何编程语言的通用解决方案。其他解决方案对我来说效果不佳。另外，我相信了解您的 IP 的更简单方法是上网。它可以是任何站点，服务器可以返回它在请求中获得的客户端 IP。您可以为其设置自己的端点。

Answer 4

遇到了同样的问题，在此页面上找到了解决方案： http://mrhawy.blogspot.it/2012/05/how-to-get-your-external-ip-address-in.html

    public String getIpAddress() throws MalformedURLException, IOException {
  URL myIP = new URL("http://api.externalip.net/ip/");
  BufferedReader in = new BufferedReader(
                       new InputStreamReader(myIP.openStream())
                      );
  return in.readLine();
  }

在使用此代码时遇到了一些问题从长远来看，一周内有几次服务器不会回复。

新的解决方案：

public static String getIpAddress() 
{ 
        URL myIP;
        try {
            myIP = new URL("http://api.externalip.net/ip/");

            BufferedReader in = new BufferedReader(
                    new InputStreamReader(myIP.openStream())
                    );
            return in.readLine();
        } catch (Exception e) 
        {
            try 
            {
                myIP = new URL("http://myip.dnsomatic.com/");

                BufferedReader in = new BufferedReader(
                        new InputStreamReader(myIP.openStream())
                        );
                return in.readLine();
            } catch (Exception e1) 
            {
                try {
                    myIP = new URL("http://icanhazip.com/");

                    BufferedReader in = new BufferedReader(
                            new InputStreamReader(myIP.openStream())
                            );
                    return in.readLine();
                } catch (Exception e2) {
                    e2.printStackTrace(); 
                }
            }
        }

    return null;
}

Answer 5

我的解决方案仅返回 1 个 Ip4 地址：

try {
    Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
    while (interfaces.hasMoreElements()) {
        NetworkInterface iface = interfaces.nextElement();
        if (iface.isLoopback() || !iface.isUp() || iface.isVirtual() || iface.isPointToPoint())
            continue;

        Enumeration<InetAddress> addresses = iface.getInetAddresses();
        while(addresses.hasMoreElements()) {
            InetAddress addr = addresses.nextElement();

            final String ip = addr.getHostAddress();
            if(Inet4Address.class == addr.getClass()) return ip;
        }
    }
} catch (SocketException e) {
    throw new RuntimeException(e);
}
return null;

Answer 6

默认网络接口的另一种选择，只是我 5 分钟前尝试并看到了你的问题:)

InetAddress[] localaddr;

try {
    localaddr = InetAddress.getAllByName("host.name");

    for(int i = 0; i < localaddr.length; i++){
        System.out.println("\n" + localaddr[i].getHostAddress());
    }
} catch (UnknownHostException e) {
    e.printStackTrace();
}

Answer 7

//This program is find your exact LAN(Local Machine on which your are       //runing this program) IP Address 
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

public class GetMyIPAddress {
public static void main(String gks[]) throws SocketException{
    Enumeration e = NetworkInterface.getNetworkInterfaces();
    int ctr=0;
    while(e.hasMoreElements())
    {
        NetworkInterface n = (NetworkInterface) e.nextElement();
        Enumeration ee = n.getInetAddresses();
        while (ee.hasMoreElements() && ctr<3)
        {       ctr++;
            if(ctr==3)
                break;
                InetAddress i = (InetAddress) ee.nextElement();
                    if(ctr==2)
                         System.out.println(i.getHostAddress());

        }
    }
}

}

Answer 8

这是我获取IP地址的方法。

1. 获取你的默认网关地址
2. 获取你电脑中的所有地址
3. 现在你的IP(假设192.168.100.4)和默认网关IP(假设192.168.100.1)的地址前9位必须相同，所以满足这个条件的IP就是你的IP。

请参阅下面的完整工作代码。

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.StringTokenizer;
import java.util.TreeSet;

public class MyIpAddress {

    public static void main(String[] args) {
        // doPortForwarding();

        MyIpAddress myIpAddress = new MyIpAddress();

        // get default address
        String yourIp = myIpAddress.getYourIp(myIpAddress
                .getDefaultGateWayAddress());
        System.out.println(yourIp);

        // get

    } // amin

    // return ip address for which u need to do port forwarding
    private String getYourIp(String defaultAddress) {

        String temp = defaultAddress.substring(0, 11);
        String ipToForward = "";

        TreeSet<String> ipAddrs = getIpAddressList();
        for (Iterator<String> iterator = ipAddrs.iterator(); iterator.hasNext();) {

            String tempIp = iterator.next();
            if (tempIp.contains(temp)) {
                ipToForward = tempIp;
                break;
            }
        }

        return ipToForward;

    }// ipForPortForwarding

    // get the ipaddress list
    private TreeSet<String> getIpAddressList() {
        TreeSet<String> ipAddrs = new TreeSet<String>();

        try {
            Enumeration<NetworkInterface> interfaces = NetworkInterface
                    .getNetworkInterfaces();
            while (interfaces.hasMoreElements()) {
                NetworkInterface iface = interfaces.nextElement();
                // filters out 127.0.0.1 and inactive interfaces
                if (iface.isLoopback() || !iface.isUp())
                    continue;

                Enumeration<InetAddress> addresses = iface.getInetAddresses();
                while (addresses.hasMoreElements()) {

                    InetAddress addr = addresses.nextElement();

                    ipAddrs.add(addr.getHostAddress());

                }// 2 nd while
            }// 1 st while
        } catch (SocketException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return ipAddrs;

    }// getIpAddressList

    // get default gateway address in java

    private String getDefaultGateWayAddress() {
        String defaultAddress = "";
        try {
            Process result = Runtime.getRuntime().exec("netstat -rn");

            BufferedReader output = new BufferedReader(new InputStreamReader(
                    result.getInputStream()));

            String line = output.readLine();
            while (line != null) {
                if (line.contains("0.0.0.0")) {

                    StringTokenizer stringTokenizer = new StringTokenizer(line);
                    stringTokenizer.nextElement();// first string is 0.0.0.0
                    stringTokenizer.nextElement();// second string is 0.0.0.0
                    defaultAddress = (String) stringTokenizer.nextElement(); // this is our default address
                    break;
                }

                line = output.readLine();

            }// while
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return defaultAddress;

    }// getDefaultAddress
}

Answer 9

你需要这里获取jsoup的jar
在你的java项目中添加jsoup的jar并解释这行代码，你将得到你的ip地址，

Document doc = Jsoup.connect("https://whatismyipaddress.com/").timeout(10000).get() ;
Elements el = doc.select("div#section_left") ;
Element e = el.select("a").get(
System.out.println(e.text());

Answer 10

您可以通过编写简单的代码来获取您的IP地址。
`

import java.net.InetAddress;

public class Main {
    public static void main(String[] args) throws Exception
    {
        System.out.println(InetAddress.getLocalHost());
    }
}