JavaでMacアドレスを取得するサンプルコード

2014年10月25日

Javaコード：
private static String[] getAllLocalMac() {
List res = new ArrayList();
Enumeration netInterfaces;
try {
netInterfaces = NetworkInterface.getNetworkInterfaces();
while (netInterfaces.hasMoreElements()) {
NetworkInterface ni = (NetworkInterface) netInterfaces.nextElement();
byte[] mac = ni.getHardwareAddress();
StringBuilder sb = new StringBuilder();
if (mac != null) {
for (byte b : mac) {
sb.append(toHex(b));
sb.append(“-“);
}
if (sb.length() > 1)
sb.deleteCharAt(sb.length() – 1);
res.add(sb.toString());

}
}
} catch (SocketException e) {
e.printStackTrace();
}
return (String[]) res.toArray(new String[0]);
}

public static StringBuffer toHex(byte b) {
byte factor = 16;
int v = b & 0xff;
byte high = (byte) (v / factor);
byte low = (byte) (v % factor);
StringBuffer buf = new StringBuffer();
buf.append(toHexLow(high)).append(toHexLow(low));
return buf;
}

private static char toHexLow(byte b) {
if (b > 16 || b < 0) {
throw new IllegalArgumentException(“inpt parameter should less than 16 and greater than 0");
}
if (b < 10) {
return (char) ('0’ + (char) b);
} else {
return (char) ('A’ + (b – 10));
}
}