首先要说的是：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

测试效果图：

java通过ip获取mac地址-封ip封mac地址

package com.yjf.test;

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;  
     }
     
     
   来源地址：http://yijianfengvip.blog.163.com/blog/static/175273432201212295830661/
     
     /** 
      * 
      * @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;  
     }  
      来源博客：http://yijianfengvip.blog.163.com/blog/static/175273432201212295830661/
   
     /** 
     * 
     * @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;
     }
         来源博客：http://yijianfengvip.blog.163.com/blog/static/175273432201212295830661/
     /** 
     * 测试 
     */  
     public static void main(String[] args) {           
         System.out.println(getMacAddress("220.181.111.148"));
     }
    
}

java通过ip获取mac地址-封ip封mac地址

测试效果图：

      本文转自yjflinchong 51CTO博客，原文链接：http://blog.51cto.com/yjflinchong/1164986，如需转载请自行联系原作者