北大青鸟java课程 获取网卡MAC地址及序列号的方法

　　北大青鸟java课程 获取网卡MAC地址及序列号的方法

import java.io.BufferedReader;  import java.io.IOException;  import java.io.InputStreamReader;  import java.net.NetworkInterface;  import java.net.SocketException;  import java.util.Enumeration;    public class MACAddress {      public MACAddress() {      }        public static String getMACAddress() {            String address = "";          String os = System.getProperty("os.name");          if (os != null && os.startsWith("Windows")) {              try {                  String command = "cmd.exe /c ipconfig /all";                  Process p = Runtime.getRuntime().exec(command);                  BufferedReader br = new BufferedReader(new InputStreamReader(p                          .getInputStream()));                  String line;                  while ((line = br.readLine()) != null) {                      if (line.indexOf("Physical Address") > 0) {                          int index = line.indexOf(":");                          index += 2;                          address = line.substring(index);                          break;                      }                  }                  br.close();                  return address.trim();              } catch (IOException e) {              }          }          return address;      }        public static void main(String[] args) {          // System.out.println(""+MACAddress.getMACAddress());          try {              // 枚举所有网络接口设备              Enumeration intefaces = NetworkInterface.getNetworkInterfaces();              // 循环处理每一个网络接口设备              while (intefaces.hasMoreElements()) {                  NetworkInterface face = (NetworkInterface) intefaces                          .nextElement();                  if (face.getName().length() >= 3) {                      if ((face.getName()).substring(0, 3).equals("eth") || (face.getName()).substring(0, 3).equals("net")) {                            byte[] mac = face.getHardwareAddress();                          if (mac != null && mac.length == 6) {                              System.out.println("网卡显示名称："                                      + face.getDisplayName());                              System.out.println("网卡设备名称：" + face.getName());                              System.out.println("MAC地址：" + bytes2mac(mac));  //                          break;                          }                      }                  }              }          } catch (SocketException e) {              // TODO Auto-generated catch block              e.printStackTrace();          }      }        private static String bytes2mac(byte[] bytes) {          if (bytes.length != 6) {              System.out.println("地址错误");              return null;          }          StringBuffer macString = new StringBuffer();          byte currentByte;          for (int i = 0; i < bytes.length; i++) {              currentByte = (byte) ((bytes[i] & 240) >> 4);              macString.append(Integer.toHexString(currentByte));              currentByte = (byte) (bytes[i] & 15);              macString.append(Integer.toHexString(currentByte));              macString.append("-");          }          macString.delete(macString.length() - 1, macString.length());            return macString.toString().toUpperCase();      }  }