java通过ip获取客户端Mac地址的小例子

package com.yswc.dao.sign;

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;
 }
 public static void main(string[] args) {
 string mac=getmacaddress("192.168.1.102");
 system.out.println("mac:"+mac);
}

}