java如何查询本机ip地址和mac地址

Posted 2023-04-13

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Java中可以使用程序来获取本地ip地址和mac地址，使用InetAddress这个工具类，示例如下：

import java.net.*;
public class NetInfo
public static void main(String[] args)
    new NetInfo().say();

public void say()
   try
   InetAddress i = InetAddress.getLocalHost();
   System.out.println(i);                  //计算机名称和IP
   System.out.println(i.getHostName());    //名称
   System.out.println(i.getHostAddress()); //只获得IP

   catch(Exception e)e.printStackTrace();

也可以通过命令行窗口来查看本地ip和mac地址，输入命令：ipconfig。

参考技术A import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;

public class getIpAndMac

public static void main(String[] args) throws UnknownHostException,
SocketException
InetAddress addr = InetAddress.getLocalHost();
String ip = addr.getHostAddress().toString();// 获得本机IP
System.out.println("本机ip：" + ip);
getLocalMac(addr);

private static void getLocalMac(InetAddress ia) throws SocketException
// TODO Auto-generated method stub
// 获取网卡，获取地址
byte[] mac = NetworkInterface.getByInetAddress(ia).getHardwareAddress();
StringBuffer sb = new StringBuffer("");
for (int i = 0; i < mac.length; i++)
if (i != 0)
sb.append("-");

// 字节转换为整数
int temp = mac[i] & 0xff;
String str = Integer.toHexString(temp);
if (str.length() == 1)
sb.append("0" + str);
else
sb.append(str);

System.out.println("本机MAC地址:" + sb.toString().toUpperCase());

参考技术B import java.io.IOException;
import java.io.InputStreamReader;


public class GetMacAddress


     public static String getOSName()
         return System.getProperty("os.name").toLowerCase();



     public static String getUnixMACAddress()
         String mac = null;
         BufferedReader bufferedReader = null;
         Process process = null;
         try

             process = Runtime.getRuntime().exec("ifconfig eth0");
             bufferedReader = new BufferedReader(new InputStreamReader(process
                     .getInputStream()));
             String line = null;
             int index = -1;
             while ((line = bufferedReader.readLine()) != null)

                 index = line.toLowerCase().indexOf("hwaddr");

                 if (index != -1)

                     mac = line.substring(index +"hwaddr".length()+ 1).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 String getLinuxMACAddress()
             String mac = null;
             BufferedReader bufferedReader = null;
             Process process = null;
             try

                 process = Runtime.getRuntime().exec("ifconfig eth0");
                 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 String getWindowsMACAddress()
             String mac = null;
             BufferedReader bufferedReader = null;
             Process process = null;
             try

                 process = Runtime.getRuntime().exec("ipconfig /all");
                 bufferedReader = new BufferedReader(new InputStreamReader(process
                         .getInputStream()));
                 String line = null;
                 int index = -1;
                 while ((line = bufferedReader.readLine()) != null)

                     index = line.toLowerCase().indexOf("physical address");
                     if (index != -1)
                         index = line.indexOf(":");
                         if (index != -1)

                            mac = line.substring(index + 1).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 os = getOSName();
             System.out.println(os);
             if(os.startsWith("windows"))
                 String mac = getWindowsMACAddress();
                 System.out.println("本地是windows:"+mac);
             else if(os.startsWith("linux"))
                   String mac = getLinuxMACAddress();
                 System.out.println("本地是Linux系统,MAC地址是:"+mac);
             else
                 String mac = getUnixMACAddress();
                 System.out.println("本地是Unix系统 MAC地址是:"+mac);

参考技术C IP地址：java.net.InetAddress类的 getLocalHost() 方法
MAC地址：没有直接的方法，百度搜“java 获得本机mac地址”有很多。
我的理解：因为java的网络程序是面向TCP/IP层的，MAC地址属于链路层了，在IP层的下面，java看不到。所以要调用c和c++做的程序，比如Windows系统自带的ipconfig 参考技术D import java.net.*;
public class NetInfo
public static void main(String[] args)
new NetInfo().say();

public void say()
try
InetAddress i = InetAddress.getLocalHost();
System.out.println(i); //计算机名称和IP
System.out.println(i.getHostName()); //名称
System.out.println(i.getHostAddress()); //只获得IP

catch(Exception e)e.printStackTrace();