Java Mac Address Get getMacAddress()

Description

get Mac Address

License

Apache License

Declaration

public final static String getMacAddress() throws IOException 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.io.BufferedInputStream;

import java.io.IOException;
import java.io.InputStream;

import java.net.InetAddress;
import java.text.ParseException;
import java.util.StringTokenizer;

public class Main {
    public final static String getMacAddress() throws IOException {
        String os = System.getProperty("os.name");

        try {//from   ww  w  .j a  v  a  2  s  .  com
            if (os.startsWith("Windows")) {
                return windowsParseMacAddress(windowsRunIpConfigCommand());
            } else if (os.startsWith("Linux")) {
                return linuxParseMacAddress(linuxRunIfConfigCommand());
            } else {
                throw new IOException("unknown operating system: " + os);
            }
        } catch (ParseException ex) {
            ex.printStackTrace();
            throw new IOException(ex.getMessage());
        }
    }

    /**
     * Windows stuff
     */
    private final static String windowsParseMacAddress(String ipConfigResponse) throws ParseException {
        String localHost = null;
        try {
            localHost = InetAddress.getLocalHost().getHostAddress();
        } catch (java.net.UnknownHostException ex) {
            ex.printStackTrace();
            throw new ParseException(ex.getMessage(), 0);
        }

        StringTokenizer tokenizer = new StringTokenizer(ipConfigResponse, "\n");
        String lastMacAddress = null;

        while (tokenizer.hasMoreTokens()) {
            String line = tokenizer.nextToken().trim();

            // see if line contains IP address
            if (line.endsWith(localHost) && lastMacAddress != null) {
                return lastMacAddress;
            }

            // see if line contains MAC address
            int macAddressPosition = line.indexOf(":");
            if (macAddressPosition <= 0)
                continue;

            String macAddressCandidate = line.substring(macAddressPosition + 1).trim();
            if (windowsIsMacAddress(macAddressCandidate)) {
                lastMacAddress = macAddressCandidate;
                continue;
            }
        }

        ParseException ex = new ParseException("cannot read MAC address from [" + ipConfigResponse + "]", 0);
        ex.printStackTrace();
        throw ex;
    }

    private final static String windowsRunIpConfigCommand() throws IOException {
        Process p = Runtime.getRuntime().exec("ipconfig /all");
        InputStream stdoutStream = new BufferedInputStream(p.getInputStream());

        StringBuffer buffer = new StringBuffer();
        for (;;) {
            int c = stdoutStream.read();
            if (c == -1)
                break;
            buffer.append((char) c);
        }
        String outputText = buffer.toString();

        stdoutStream.close();

        return outputText;
    }

    /**
     * Linux stuff
     */
    private final static String linuxParseMacAddress(String ipConfigResponse) throws ParseException {
        String localHost = null;
        try {
            localHost = InetAddress.getLocalHost().getHostAddress();
        } catch (java.net.UnknownHostException ex) {
            ex.printStackTrace();
            throw new ParseException(ex.getMessage(), 0);
        }

        StringTokenizer tokenizer = new StringTokenizer(ipConfigResponse, "\n");
        String lastMacAddress = null;

        while (tokenizer.hasMoreTokens()) {
            String line = tokenizer.nextToken().trim();
            boolean containsLocalHost = line.indexOf(localHost) >= 0;

            // see if line contains IP address
            if (containsLocalHost && lastMacAddress != null) {
                return lastMacAddress;
            }

            // see if line contains MAC address
            int macAddressPosition = line.indexOf("HWaddr");
            if (macAddressPosition <= 0)
                continue;

            String macAddressCandidate = line.substring(macAddressPosition + 6).trim();
            if (linuxIsMacAddress(macAddressCandidate)) {
                lastMacAddress = macAddressCandidate;
                continue;
            }
        }

        ParseException ex = new ParseException(
                "cannot read MAC address for " + localHost + " from [" + ipConfigResponse + "]", 0);
        ex.printStackTrace();
        throw ex;
    }

    private final static String linuxRunIfConfigCommand() throws IOException {
        Process p = Runtime.getRuntime().exec("ifconfig eth0");
        InputStream stdoutStream = new BufferedInputStream(p.getInputStream());

        StringBuffer buffer = new StringBuffer();
        for (;;) {
            int c = stdoutStream.read();
            if (c == -1)
                break;
            buffer.append((char) c);
        }
        String outputText = buffer.toString();

        stdoutStream.close();

        return outputText;
    }

    private final static boolean windowsIsMacAddress(String macAddressCandidate) {
        // TODO: use a smart regular expression
        if (macAddressCandidate.length() != 17)
            return false;

        return true;
    }

    private final static boolean linuxIsMacAddress(String macAddressCandidate) {
        if (macAddressCandidate.length() != 17)
            return false;
        return true;
    }
}

Related

1. getMac()
2. getMacAddr()
3. getMacAddress()
4. getMACAddress()
5. getMACAddress()
6. getMacAddress()
7. getMacAddress()
8. getMacAddress()