Java获取本机MAC地址和IP

Java中获取windows、Linux和windows7的MAC地址 http://yuelangyc.iteye.com/blog/1069713
多网卡是存在问题，比如会找到Virsualbox的网卡。

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.NetworkInterface;

/**
 * 与系统相关的一些常用工具方法.
 * 
 * @author lvbogun
 * @version 1.0.0
 */
public class SystemTool {

	/**
	 * 获取当前操作系统名称. return 操作系统名称 例如:windows xp,linux 等.
	 */
	public static String getOSName() {
		return System.getProperty("os.name").toLowerCase();
	}

	/**
	 * 获取unix网卡的mac地址. 非windows的系统默认调用本方法获取.
	 * 如果有特殊系统请继续扩充新的取mac地址方法.
	 * 
	 * @return mac地址
	 */
	public static String getUnixMACAddress() {
		String mac = null;
		BufferedReader bufferedReader = null;
		Process process = null;
		try {
			// linux下的命令，一般取eth0作为本地主网卡
			process = Runtime.getRuntime().exec("ifconfig eth0");
			// 显示信息中包含有mac地址信息
			bufferedReader = new BufferedReader(new InputStreamReader(
					process.getInputStream()));
			String line = null;
			int index = -1;
			while ((line = bufferedReader.readLine()) != null) {
				// 寻找标示字符串[hwaddr]
				index = line.toLowerCase().indexOf("hwaddr");
				if (index >= 0) {// 找到了
					// 取出mac地址并去除2边空格
					mac = line.substring(index + "hwaddr".length() + 1).trim();
					break;
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				if (bufferedReader != null) {
					bufferedReader.close();
				}
			} catch (IOException e1) {
				e1.printStackTrace();
			}
			bufferedReader = null;
			process = null;
		}
		return mac;
	}

	/**
	 * 获取widnows网卡的mac地址.
	 * 
	 * @return mac地址
	 */
	public static String getWindowsMACAddress() {
		String mac = null;
		BufferedReader bufferedReader = null;
		Process process = null;
		try {
			// windows下的命令，显示信息中包含有mac地址信息
			process = Runtime.getRuntime().exec("ipconfig /all");
			bufferedReader = new BufferedReader(new InputStreamReader(
					process.getInputStream()));
			String line = null;
			int index = -1;
			while ((line = bufferedReader.readLine()) != null) {
				System.out.println(line);
				// 寻找标示字符串[physical
				index = line.toLowerCase().indexOf("physical address");
				
				if (index >= 0) {// 找到了
					index = line.indexOf(":");// 寻找":"的位置
					if (index >= 0) {
						System.out.println(mac);
						// 取出mac地址并去除2边空格
						mac = line.substring(index + 1).trim();
					}
					break;
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				if (bufferedReader != null) {
					bufferedReader.close();
				}
			} catch (IOException e1) {
				e1.printStackTrace();
			}
			bufferedReader = null;
			process = null;
		}

		return mac;
	}

	/**
	 * windows 7 专用 获取MAC地址
	 * 
	 * @return
	 * @throws Exception
	 */
	public static String getMACAddress() throws Exception {
		
		// 获取本地IP对象
		InetAddress ia = InetAddress.getLocalHost();
		// 获得网络接口对象（即网卡），并得到mac地址，mac地址存在于一个byte数组中。
		byte[] mac = NetworkInterface.getByInetAddress(ia).getHardwareAddress();

		// 下面代码是把mac地址拼装成String
		StringBuffer sb = new StringBuffer();

		for (int i = 0; i < mac.length; i++) {
			if (i != 0) {
				sb.append("-");
			}
			// mac[i] & 0xFF 是为了把byte转化为正整数
			String s = Integer.toHexString(mac[i] & 0xFF);
			sb.append(s.length() == 1 ? 0 + s : s);
		}

		// 把字符串所有小写字母改为大写成为正规的mac地址并返回
		return sb.toString().toUpperCase();
	}

	/**
	 * 测试用的main方法.
	 * 
	 * @param argc 运行参数.
	 * @throws Exception
	 */
	public static void main(String[] argc) throws Exception {
		String os = getOSName();
		System.out.println(os);
		if (os.equals("windows 7")) {
			String mac = getMACAddress();
			System.out.println(mac);
		} else if (os.startsWith("windows")) {
			// 本地是windows
			String mac = getWindowsMACAddress();
			System.out.println(mac);
		} else {
			// 本地是非windows系统 一般就是unix
			String mac = getUnixMACAddress();
			System.out.println(mac);
		}
	}
}

得到所有IP
这段代码会输出计算机中所有设备的ip，找需要的
http://kaza.iteye.com/blog/169889

Enumeration<NetworkInterface> netInterfaces = null;
try {
	netInterfaces = NetworkInterface.getNetworkInterfaces();
	while (netInterfaces.hasMoreElements()) {
		NetworkInterface ni = netInterfaces.nextElement();
		System.out.println("DisplayName:" + ni.getDisplayName());
		System.out.println("Name:" + ni.getName());
		Enumeration<InetAddress> ips = ni.getInetAddresses();
		while (ips.hasMoreElements()) {
			System.out.println("IP:"
			+ ips.nextElement().getHostAddress());
		}
	}
} catch (Exception e) {
	e.printStackTrace();
}

http://www.cnblogs.com/hxsyl/p/3422191.html
以下代码在多网卡出现问题

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
/*
 * 物理地址是48位，别和ipv6搞错了
 */
public class LOCALMAC {
	/**
	 * @param args
	 * @throws UnknownHostException 
	 * @throws SocketException 
	 */
	public static void main(String[] args) throws UnknownHostException, SocketException {
		// TODO Auto-generated method stub
		
		//得到IP，输出PC-201309011313/122.206.73.83
		InetAddress ia = InetAddress.getLocalHost();
		System.out.println(ia);
		getLocalMac(ia);
	}
	private static void getLocalMac(InetAddress ia) throws SocketException {
		// TODO Auto-generated method stub
		//获取网卡，获取地址
		byte[] mac = NetworkInterface.getByInetAddress(ia).getHardwareAddress();
		System.out.println("mac数组长度："+mac.length);
		StringBuffer sb = new StringBuffer("");
		for(int i=0; i<mac.length; i++) {
			if(i!=0) {
				sb.append("-");
			}
			//字节转换为整数
			int temp = mac[i]&0xff;
			String str = Integer.toHexString(temp);
			System.out.println("每8位:"+str);
			if(str.length()==1) {
				sb.append("0"+str);
			}else {
				sb.append(str);
			}
		}
		System.out.println("本机MAC地址:"+sb.toString().toUpperCase());
	}
}