利用JNI调用Java工具类得到MAC地址

Enumeration<NetworkInterface> nis = NetworkInterface.getNetworkInterfaces();
		while (nis.hasMoreElements()) {
			NetworkInterface ni = nis.nextElement();
			byte[] bs = ni.getHardwareAddress();
			if (ni != null && ni.isUp() && bs != null && bs.length == 6){
				StringBuffer sb = new StringBuffer();
				for (byte b : bs) {  
					//与11110000作按位与运算以便读取当前字节高4位  
					sb.append(Integer.toHexString((b & 240) >> 4));  
					//与00001111作按位与运算以便读取当前字节低4位  
					sb.append(Integer.toHexString(b & 15));  
					sb.append("-");  
				}  
				sb.deleteCharAt(sb.length() - 1);  
				System.out.println(sb.toString().toUpperCase());
			}
		}