java获取mac地址屏蔽ip封mac地址

package org.xiazdong.utils.ip;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class IP2MACUtils {
	public static String getMacAddress(String ip) {
		String macAddress = "";
		macAddress = getMacInWindows(ip).trim();
		if (macAddress == null || "".equals(macAddress)) {
			macAddress = getMacInLinux(ip).trim();
		}
		return macAddress;
	}

	private static String getMacInWindows(final String ip) {
		String result = "";
		String[] cmd = { "cmd", "/c", "ping " + ip };
		String[] another = { "cmd", "/c", "arp -a" };

		String cmdResult = callCmd(cmd, another);
		result = filterMacAddress(ip, cmdResult, "-");

		return result;
	}

	private static String filterMacAddress(final String ip,
			final String sourceString, final String macSeparator) {
		String result = "";
		String regExp = "((([0-9,A-F,a-f]{1,2}" + macSeparator
				+ "){1,5})[0-9,A-F,a-f]{1,2})";
		Pattern pattern = Pattern.compile(regExp);
		Matcher matcher = pattern.matcher(sourceString);
		while (matcher.find()) {
			result = matcher.group(1);
			if (sourceString.indexOf(ip) <= sourceString.lastIndexOf(matcher
					.group(1))) {
				break; // 如果有多个IP,只匹配本IP对应的Mac.
			}
		}

		return result;
	}

	private static String callCmd(String[] cmd, String[] another) {
		String result = "";
		String line = "";
		try {
			Runtime rt = Runtime.getRuntime();
			Process proc = rt.exec(cmd);
			proc.waitFor(); // 已经执行完第一个命令，准备执行第二个命令
			proc = rt.exec(another);
			InputStreamReader is = new InputStreamReader(proc.getInputStream());
			BufferedReader br = new BufferedReader(is);
			while ((line = br.readLine()) != null) {
				result += line;
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}

	private static String callCmd(String[] cmd) {
		String result = "";
		String line = "";
		try {
			Process proc = Runtime.getRuntime().exec(cmd);
			InputStreamReader is = new InputStreamReader(proc.getInputStream());
			BufferedReader br = new BufferedReader(is);
			while ((line = br.readLine()) != null) {
				result += line;
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}

	private static String getMacInLinux(final String ip) {
		String result = "";
		String[] cmd = { "/bin/sh", "-c", "ping " + ip + " -c 2 && arp -a" };
		String cmdResult = callCmd(cmd);
		result = filterMacAddress(ip, cmdResult, ":");

		return result;
	}

}