使用java获取本地网络的IP地址

Question

我希望在连接到wifi网络时，在运行我的应用程序的手机上获取用户的本地IPv4地址。使用以下代码：

  WifiManager wm = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);
                    String ip = Formatter.formatIpAddress(wm.getConnectionInfo().getIpAddress());
                    hostname = ip;

我可以得到一些接近IPv4地址的信息，但与命令行中的IPv4地址相比，它并不完全相同。有更好的办法吗？我知道formatIpAddress已被弃用，但在我找到获取IPv4地址的方法之前，我暂时不太担心这个问题。

编辑：

我发现手机wifi设置中的ip地址是我在使用建议的解决方案获取ip地址时得到的。有没有办法在ip配置客户端获取ip地址？

Answer 1

下面的代码遍历它拥有的所有接口，然后打印接口的IPv4、IPv6和mac地址。对于局域网IP地址，你可以使用一个函数，如果IP地址是本地地址，它将返回true。

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Enumeration;
public class App{

public static void main(String[] args)throws Exception {
    // getting the list of interfaces in the local machine
    Enumeration<NetworkInterface> n = NetworkInterface.getNetworkInterfaces();
    while( n.hasMoreElements()){ //for each interface
        System.out.println("----------------------------------------------------");
        NetworkInterface e = n.nextElement();
    //name of the interface
        System.out.println("Interface Name: " + e.getName());
    /* A interface may be binded to many IP addresses like IPv4 and IPv6
        hence getting the Enumeration of list of IP addresses  */
        Enumeration<InetAddress> a = e.getInetAddresses();
        while( a.hasMoreElements()){
            InetAddress addr = a.nextElement();
            String add = addr.getHostAddress().toString();
            if( add.length() < 17 )
                System.out.println("IPv4 Address: " + add);
            else
                System.out.println("IPv6 Address: " + add);
        }
        if(e.getHardwareAddress() != null){
                    // getting the mac address of the particular network interface
            byte[] mac = e.getHardwareAddress();
                    // properly formatting the mac address
            StringBuilder macAddress = new StringBuilder();
            for(int i =0; i < mac.length; i++){
                macAddress.append(String.format("%03X%s", mac[i],(i < mac.length -1) ? "-":""));
            }
            System.out.println("Hardware adrress: " + macAddress.toString());
        }
        System.out.println("----------------------------------------------------");
    }
}

}

kali linux 2.0中代码的输出为：
----------------------------------------------------
接口名：wlan0
IPv6地址：fe80:0:0:0:1992:d9bc:7d8c:d85b%wlan0
IPv4 Address: 192.168.1.137
Hardware adrress: 078-0E4-000-0E7-0B0-046
----------------------------------------------------
----------------------------------------------------
Interface Name: lo
IPv6 Address: 0:0:0:0:0:0:0:1%lo
IPv4 Address: 127.0.0.1
----------------------------------------------------

Answer 2

代码打印运行Android或java应用程序的设备的本地IPv4地址。

 try {
        Enumeration networkInterfaces = NetworkInterface.getNetworkInterfaces();  // gets All networkInterfaces of your device
        while (networkInterfaces.hasMoreElements()) {
            NetworkInterface inet = (NetworkInterface) networkInterfaces.nextElement();
            Enumeration address = inet.getInetAddresses();
            while (address.hasMoreElements()) {
                InetAddress inetAddress = (InetAddress) address.nextElement();
                if (inetAddress.isSiteLocalAddress()) {
                    System.out.println("Your ip: " + inetAddress.getHostAddress());  /// gives ip address of your device
                }
            }
        }
    } catch (Exception e) {
        // Handle Exception
    }