方法一：将本机地址与局域网内其他机器区分开来
/** * 根据IP地址获取mac地址 * @param ipAddress 127.0.0.1 * @return * @throws SocketException * @throws UnknownHostException */ public static String getLocalMac(String ipAddress) throws SocketException, UnknownHostException { // TODO Auto-generated method stub String str = ""; String macAddress = ""; final String LOOPBACK_ADDRESS = "127.0.0.1"; // 如果为127.0.0.1,则获取本地MAC地址。 if (LOOPBACK_ADDRESS.equals(ipAddress)) { InetAddress inetAddress = InetAddress.getLocalHost(); // 貌似此方法需要JDK1.6。 byte[] mac = NetworkInterface.getByInetAddress(inetAddress) .getHardwareAddress(); // 下面代码是把mac地址拼装成String StringBuilder sb = new StringBuilder(); for (int i = 0; i < mac.length; i++) { if (i != 0) { sb.append("-"); } // mac[i] & 0xFF 是为了把byte转化为正整数 String s = Integer.toHexString(mac[i] & 0xFF); sb.append(s.length() == 1 ? 0 + s : s); } // 把字符串所有小写字母改为大写成为正规的mac地址并返回 macAddress = sb.toString().trim().toUpperCase(); return macAddress; } else { // 获取非本地IP的MAC地址 try { System.out.println(ipAddress); Process p = Runtime.getRuntime() .exec("nbtstat -A " + ipAddress); System.out.println("===process=="+p); InputStreamReader ir = new InputStreamReader(p.getInputStream()); BufferedReader br = new BufferedReader(ir); while ((str = br.readLine()) != null) { if(str.indexOf("MAC")>1){ macAddress = str.substring(str.indexOf("MAC")+9, str.length()); macAddress = macAddress.trim(); System.out.println("macAddress:" + macAddress); break; } } p.destroy(); br.close(); ir.close(); } catch (IOException ex) { } return macAddress; } }我们再来看下方法二：
package com.alpha.test;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.LineNumberReader;public class GetMac {/** * java获取客户端网卡的MAC地址 * * @param args */public static void main(String[] args) {GetMac get = new GetMac();System.out.println("1="+get.getMAC());System.out.println("2="+get.getMAC("127.0.0.1"));}// 1.获取客户端ip地址( 这个必须从客户端传到后台)：// jsp页面下，很简单，request.getRemoteAddr() ;// 因为系统的VIew层是用JSF来实现的，因此页面上没法直接获得类似request，在bean里做了个强制转换// public String getMyIP() {// try {// FacesContext fc = FacesContext.getCurrentInstance();// HttpServletRequest request = (HttpServletRequest) fc// .getExternalContext().getRequest();// return request.getRemoteAddr();// } catch (Exception e) {// e.printStackTrace();// }// return "";// }// 2.获取客户端mac地址// 调用window的命令，在后台Bean里实现 通过ip来获取mac地址。方法如下：// 运行速度【快】public String getMAC() {String mac = null;try {Process pro = Runtime.getRuntime().exec("cmd.exe /c ipconfig/all");InputStream is = pro.getInputStream();BufferedReader br = new BufferedReader(new InputStreamReader(is));String message = br.readLine();int index = -1;while (message != null) {if ((index = message.indexOf("Physical Address")) > 0) {mac = message.substring(index + 36).trim();break;}message = br.readLine();}System.out.println(mac);br.close();pro.destroy();} catch (IOException e) {System.out.println("Can't get mac address!");return null;}return mac;}// 运行速度【慢】public String getMAC(String ip) {String str = null;String macAddress = null;try {Process p = Runtime.getRuntime().exec("nbtstat -A " + ip);InputStreamReader ir = new InputStreamReader(p.getInputStream());LineNumberReader input = new LineNumberReader(ir);for (; true;) {str = input.readLine();if (str != null) {if (str.indexOf("MAC Address") > 1) {macAddress = str.substring(str.indexOf("MAC Address") + 14);break;}}}} catch (IOException e) {e.printStackTrace(System.out);return null;}return macAddress;}}方法三，更精简一些
import java.io.IOException;import java.io.InputStreamReader;import java.io.LineNumberReader;public class MACAddress { String ip; String mac; public MACAddress (String ip){ this.ip = ip; } public MACAddress (){ this.ip = "0.0.0.0"; } public String getMac(){ try { Process p = Runtime.getRuntime().exec("arp -n"); InputStreamReader ir = new InputStreamReader(p.getInputStream()); LineNumberReader input = new LineNumberReader(ir); p.waitFor(); boolean flag = true; String ipStr = "(" + this.ip + ")"; while(flag) { String str = input.readLine(); if (str != null) { if (str.indexOf(ipStr) > 1) { int temp = str.indexOf("at"); this.mac = str.substring( temp + 3, temp + 20); break; } } else flag = false; } } catch (IOException | InterruptedException e) { e.printStackTrace(System.out); } return this.mac; } public void setIp(String ip){ this.ip = ip; }}最后要放大招了，小伙伴们看仔细哦
首先要说的是：本方法可以支持外网机器的mac地址获取。
以前弄了一个只能访问局域网。 有防火墙就访问不了， 但是这个不用担心了。
测试了百度的ip，已经可以获得mac地址
java通过ip获取mac地址-封ip封mac地址
import java.io.BufferedReader;import java.io.InputStreamReader;import java.util.regex.Matcher;import java.util.regex.Pattern;/*** 获取MAC地址* @author* 2011-12*/public class GetMacAddress { 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 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; } /** * * @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 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; } /** * 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; } //做个测试 public static void main(String[] args) { System.out.println(getMacAddress("220.181.111.148")); } }