Obtain the IPv4 address of Ethernet adapter in windows using java 1.5

problem

My windows system has multiple Ethernet adapters Given the name of the Ethernet adapter, I need to find its IP address

For example, the output of the ipconfig command of my system is:

Ethernet adapter GB1:

   Connection-specific DNS Suffix  . : 
   IP Address. . . . . . . . . . . . : 0.0.0.0
   subnet Mask . . . . . . . . . . . : 0.0.0.0
   Default Gateway . . . . . . . . . : 

Ethernet adapter SWITCH:

   Connection-specific DNS Suffix  . : 
   IP Address. . . . . . . . . . . . : 10.200.1.11
   subnet Mask . . . . . . . . . . . : 255.255.255.0
   IP Address. . . . . . . . . . . . : 10.200.1.51
   subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 

Ethernet adapter LAN:

   Connection-specific DNS Suffix  . : 
   IP Address. . . . . . . . . . . . : 10.1.2.62
   subnet Mask . . . . . . . . . . . : 255.255.254.0
   IP Address. . . . . . . . . . . . : 10.1.2.151
   subnet Mask . . . . . . . . . . . : 255.255.254.0
   Default Gateway . . . . . . . . . : 10.1.2.1

Note: I don't have to worry about wireless adapters or any other type of adapters I just need to do this for the Ethernet adapter

For this system, I need to write a Java class with the following behavior:

C:>java NameToIp GB1
0.0.0.0

C:>java NameToIp SWITCH
10.200.1.11
10.200.1.51

C:>java NameToIp LAN
10.1.2.62
10.1.2.151

What won't work

Using Java net. The network interface doesn't help Its @ L_ 419_ 2 @ and getdisplayname () methods do not print the adapter connection name that appears in ipconfig output or windows network connection They print the actual device name For example, consider the following code:

import java.util.Enumeration;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.socketException;
import java.net.UnkNownHostException;

public class ListInterfaces 
{
    public static void main(String[] args) throws SocketException,UnkNownHostException {

        Enumeration<NetworkInterface> nwInterfaces = NetworkInterface.getNetworkInterfaces();

        while (nwInterfaces.hasMoreElements()) {

            NetworkInterface nwInterface = nwInterfaces.nextElement();
            System.out.print(nwInterface.getName() + ": " +
                             nwInterface.getDisplayName());

            Enumeration<InetAddress> addresses = nwInterface.getInetAddresses();
            while (addresses.hasMoreElements()) {
                InetAddress address = addresses.nextElement();
                System.out.print(" - " + address.getHostAddress());
            }
            System.out.println();
        }
    }
}

This will print the following output:

C:>java ListInterfaces
lo: MS TCP Loopback interface - 127.0.0.1
eth0: Broadcom BCM5709C NetXtreme II GigE (NDIS VBD Client) # 
eth1: Broadcom BCM5709C NetXtreme II GigE (NDIS VBD Client) #2 - 10.200.1.11 - 10.200.1.51
eth2: Broadcom BCM5709C NetXtreme II GigE (NDIS VBD Client) #3 - 10.1.2.62 - 10.1.2.151

An ugly hacker

I wrote an ugly hacker that extracted the IP address of the specified adapter name from the output of ipconfig This is the code

import java.util.ArrayList;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;
import java.io.IOException;

public class NameToIp
{
    public static ArrayList<String> getIP(String adapterName)
    throws IOException,InterruptedException
    {
        // Run the Windows 'ipconfig' command and get its stdout
        ProcessBuilder cmdBuilder = new ProcessBuilder("ipconfig");
        Process process = cmdBuilder.start();
        BufferedReader stdout = new BufferedReader(
                new InputStreamReader(process.getInputStream()));

        // Find the section for the specified adapter
        String line;
        boolean foundAdapter = false;
        while ((line = stdout.readLine()) != null) {
            line = line.trim();
            if (line.equals("Ethernet adapter " + adapterName + ':')) {
                foundAdapter = true;
                break;
            }
        }
        if (!foundAdapter) {
            process.waitFor();
            throw new IOException("Adapter not found");
        }

        // Find IP addresses in the found section
        ArrayList<String> ips = new ArrayList<String>();
        while ((line = stdout.readLine()) != null) {
            // Stop parsing if we reach the beginning of the next
            // adapter section in the output of ifconfig
            if (line.length() > 0 && line.charAt(0) != ' ') {
                break;
            }

            line = line.trim();

            // Extract IP addresses
            if (line.startsWith("IP Address.") ||
                line.startsWith("IPv4 Address.")) {

                int colonIndex;
                if ((colonIndex = line.indexOf(':')) != 1) {
                    ips.add(line.substring(colonIndex + 2));
                }
            }
        }
        process.waitFor();

        return ips;
    }

    public static void main(String[] args)
    throws IOException,InterruptedException
    {
        // Print help message if adapter name has not been specified
        if (args.length != 1) {
            StackTraceElement[] stack = Thread.currentThread().getStackTrace();
            String prog = stack[stack.length - 1].getClassName();

            System.err.println("Usage: java " + prog + " ADAPTERNAME");
            System.err.println("Examples:");
            System.err.println("  java " + prog +" \"Local Area Connection\"");
            System.err.println("  java " + prog +" LAN");
            System.err.println("  java " + prog +" SWITCH");
            System.exit(1);
        }

        ArrayList<String> ips = getIP(args[0]);
        for (String ip: ips) {
            System.out.println(ip);
        }
    } 
}

topic

Is there a better way to solve this problem?

Solution

Create a DLL that uses Windows API to query the local Ethernet address and uses JNI to call DLL