java取得IP对应的MAC地址

package com.eleventh.chapter; 
 
import java.io.BufferedReader; 
import java.io.InputStreamReader; 
import java.util.regex.Matcher; 
import java.util.regex.Pattern; 
 
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; 
     } 
      
     /** 
    * 测试 
    */   
     public static void main(String[] args) {            
        System.out.println(getMacAddress("192.168.1.125")); 
     }    
}