通过IP地址得到MAC地址

• Z时代
• 2024-01-10
• 分类：综合

public static String getMACAddress(String ip) throws Exception {    
	        String line = "";    
	        String macAddress = "";    
	        final String MAC_ADDRESS_PREFIX = "MAC Address = ";    
	        final String LOOPBACK_ADDRESS = "127.0.0.1";    
	        if (LOOPBACK_ADDRESS.equals(ip)) {    
	            InetAddress inetAddress = InetAddress.getLocalHost();    
	            //JDK1.5以上。    
	            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;    
	        }    
	        //获取非本地IP的MAC地址    
	        try {    
	            Process p = Runtime.getRuntime().exec("nbtstat -A " + ip);    
	            InputStreamReader isr = new InputStreamReader(p.getInputStream());    
	            BufferedReader br = new BufferedReader(isr);    
	            while ((line = br.readLine()) != null) {    
	                if (line != null) {    
	                    int index = line.indexOf(MAC_ADDRESS_PREFIX);    
	                    if (index != -1) {    
	                        macAddress = line.substring(index + MAC_ADDRESS_PREFIX.length()).trim().toUpperCase();    
	                    }    
	                }    
	            }    
	            br.close();    
	        } catch (IOException e) {    
	            e.printStackTrace();    
	        }    
	        return macAddress;    
	    }

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