为了项目的安全，有时候需要得到电脑的唯一码，比如：网卡的mac地址。和大家分享一下，下面是项目中用到的工具类：

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

public class MacAddressAPI {
/**
* 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) {
System.out.println("unix/linux方式未获取到网卡地址");
}
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) {
// 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) {
// 取出mac地址并去除2边空格
mac = line.substring(index + 1).trim();
}
break;
}
}
}
catch (IOException e) {
System.out.println("widnows方式未获取到网卡地址");
}
finally {
try {
if (bufferedReader != null) {
bufferedReader.close();
}
}
catch (IOException e1) {
e1.printStackTrace();
}
bufferedReader = null;
process = null;
}
return mac;
}