java 获得MAC Address

import java.net.InetAddress;
import java.io.InputStream;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.text.ParseException;
import java.util.StringTokenizer;
public final class NetworkInfo {
private final static String getMacAddress() throws IOException {
String os = System.getProperty("os.name");
try {
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());
}
}
/*
* 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 boolean linuxIsMacAddress(String macAddressCandidate) {
// TODO: use a smart regular expre