使用java获取本机mac
不开心,辛苦写的第一篇文章不小心删除了还恢复不了
想用java 获得本机地址,搜了下,觉得这个看起来不错,简洁
import java.net.InetAddress; import java.net.NetworkInterface; import java.net.SocketException; import java.net.UnknownHostException; public class app{ public static void main(String[] args){ InetAddress ip; try { ip = InetAddress.getLocalHost(); System.out.println("Current IP address : " + ip.getHostAddress()); NetworkInterface network = NetworkInterface.getByInetAddress(ip); byte[] mac = network.getHardwareAddress(); System.out.print("Current MAC address : "); StringBuilder sb = new StringBuilder(); for (int i = 0; i < mac.length; i++) { sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : "")); } System.out.println(sb.toString()); } catch (UnknownHostException e) { e.printStackTrace(); } catch (SocketException e){ e.printStackTrace(); } } }
好多都是这个版本,问题在于,一运行,报错了!!很无语,排查了很久也找不到原因,看getHardwareAddress API也没发现错误,很无奈。
mei@mei-X-Series:~/mei/test$ java Ipconfig mei-X-Series/127.0.1.1 Exception in thread "main" java.lang.NullPointerException at Ipconfig.getLocalMac(Ipconfig.java:24) at Ipconfig.main(Ipconfig.java:19)
终于在http://rupertanderson.com/blog/soapui-google-analytics-null-pointer-exception-on-ubuntu/ 中找到难友,并获知了原因,that NetworkInterface.getByInetAddress cannot match the Machine Name to any of the Network Interface values.就是不匹配了。
超出了自己的能力范围,看来智能用复杂的代码了,以下代码测试通过
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; public class getmac{ public static String getLinuxMACAddress() { String mac = null; BufferedReader bufferedReader = null; Process process = null; try { process = Runtime.getRuntime().exec("ifconfig enp4s0"); bufferedReader = new BufferedReader(new InputStreamReader( process.getInputStream())); String line = null; int index = -1; while ((line = bufferedReader.readLine()) != null) { index = line.toLowerCase().indexOf("硬件地址"); if (index != -1) { mac = line.substring(index + 4).trim(); break; } } } catch (IOException e) { e.printStackTrace(); } finally { try { if (bufferedReader != null) { bufferedReader.close(); } } catch (IOException e1) { e1.printStackTrace(); } bufferedReader = null; process = null; } return mac; } public static void main(String[] argc) { String mac = getLinuxMACAddress(); System.out.println("本地是Linux系统, MAC地址是:" + mac); } }
运行结果如下:
本地是Linux系统, MAC地址是:54:ab:3a:05:34:e6
通过最近几周的经历发现,网上的东西都是仅供参考,因为环境的不同、版本的不同会造成很大的差异,而且很多人都只是转载,从未验证,告诫自己无论任何东西,一定要切身验证,
也要养成写博客的习惯,把自己的过程记录记载下来,供别人和自己以后参考。