Java 获取客户端mac地址

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;
  }
}