通过IP地址获得mac地址

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摘自脚本之家
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原址：http://www.jb51.net/article/73882.htm

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

public class MacAddressUtil {

/** * 获取MAC地址 *  * @return 返回MAC地址 */public static String getMacAddress(String ip) {    String macAddress = "";    macAddress = getMacInWindows(ip).trim();    if (macAddress == null || "".equals(macAddress)) {        macAddress = getMacInLinux(ip).trim();    }    return macAddress;}/** *  * @param ip *            目标ip * @return Mac Address *  */public 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;}/** * @param ip *            目标ip * @return Mac Address *  */public 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;}public 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;}/** *  * @param ip *            目标ip,一般在局域网内 * @param sourceString *            命令处理的结果字符串 * @param macSeparator *            mac分隔符号 * @return mac地址，用上面的分隔符号表示 */public 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;}/** *  * @param cmd *            第一个命令 * @param another *            第二个命令 * @return 第二个命令的执行结果 */public 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;}

}

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