java实现获取用户的MAC地址

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"));
   }

}