java实现通过IP地址获取mac(物理地址),只能获取到局域网的mac地址,具体代码如下:
package com.qcmsa.util;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import java.io.IOException;import java.net.*;public class UdpGetClientMacAddr { private static Log log = LogFactory.getLog(UdpGetClientMacAddr.class); private String remoteAddr; private int remotePort = 137; private byte[] buffer = new byte[1024]; private DatagramSocket ds = null; public UdpGetClientMacAddr(String strAddr) throws Exception { remoteAddr = strAddr; ds = new DatagramSocket(); } //发送数据包 protected final DatagramPacket send(final byte[] bytes) throws IOException { DatagramPacket dp = new DatagramPacket(bytes, bytes.length, InetAddress.getByName(remoteAddr), remotePort); ds.send(dp); return dp; } //接收数据包 protected final DatagramPacket receive() { DatagramPacket dp = new DatagramPacket(buffer, buffer.length); try { ds.setSoTimeout(3000); ds.receive(dp); }catch(SocketTimeoutException ex) { log.info("接收数据超时...,不能获取客户端MAC地址"); // throw new SocketTimeoutException("连接超时"); } catch (SocketException e1) { log.error("发生Sorcket异常..."+e1.getMessage()); e1.printStackTrace(); }catch (IOException e2) { log.error("发生IO异常..."+e2.getMessage()); } return dp; } // 询问包结构: // Transaction ID 两字节(16位) 0x00 0x00 // Flags 两字节(16位) 0x00 0x10 // Questions 两字节(16位) 0x00 0x01 // AnswerRRs 两字节(16位) 0x00 0x00 // AuthorityRRs 两字节(16位) 0x00 0x00 // AdditionalRRs 两字节(16位) 0x00 0x00 // Name:array [1..34] 0x20 0x43 0x4B 0x41(30个) 0x00 ; // Type:NBSTAT 两字节 0x00 0x21 // Class:INET 两字节(16位)0x00 0x01 protected byte[] getQueryCmd() throws Exception { byte[] t_ns = new byte[50]; t_ns[0] = 0x00; t_ns[1] = 0x00; t_ns[2] = 0x00; t_ns[3] = 0x10; t_ns[4] = 0x00; t_ns[5] = 0x01; t_ns[6] = 0x00; t_ns[7] = 0x00; t_ns[8] = 0x00; t_ns[9] = 0x00; t_ns[10] = 0x00; t_ns[11] = 0x00; t_ns[12] = 0x20; t_ns[13] = 0x43; t_ns[14] = 0x4B; for (int i = 15; i < 45; i++) { t_ns[i] = 0x41; } t_ns[45] = 0x00; t_ns[46] = 0x00; t_ns[47] = 0x21; t_ns[48] = 0x00; t_ns[49] = 0x01; return t_ns; } // 表1 “UDP-NetBIOS-NS”应答包的结构及主要字段一览表 // 序号 字段名 长度 // 1 Transaction ID 两字节(16位) // 2 Flags 两字节(16位) // 3 Questions 两字节(16位) // 4 AnswerRRs 两字节(16位) // 5 AuthorityRRs 两字节(16位) // 6 AdditionalRRs 两字节(16位) // 7 Name 34字节(272位) // 8 Type:NBSTAT 两字节(16位) // 9 Class:INET 两字节(16位) // 10 Time To Live 四字节(32位) // 11 Length 两字节(16位) // 12 Number of name 一个字节(8位) // NetBIOS Name Info 18×Number Of Name字节 // Unit ID 6字节(48位 protected final String getMacAddr(byte[] brevdata) throws Exception { // 获取计算机名 // System.out.println(new String(brevdata, 57, 18)); // System.out.println(new String(brevdata, 75, 18)); // System.out.println(new String(brevdata, 93, 18)); int i = brevdata[56] * 18 + 56; String sAddr = ""; StringBuffer sb = new StringBuffer(17); // 先从第56字节位置,读出Number Of Names(NetBIOS名字的个数,其中每个NetBIOS Names Info部分占18个字节) // 然后可计算出“Unit ID”字段的位置=56+Number Of Names×18,最后从该位置起连续读取6个字节,就是目的主机的MAC地址。 for (int j = 1; j < 7; j++) { sAddr = Integer.toHexString(0xFF & brevdata[i + j]); if (sAddr.length() < 2) { sb.append(0); } sb.append(sAddr.toUpperCase()); if (j < 6) sb.append('-'); } return sb.toString(); } public final void close() { try { ds.close(); } catch (Exception ex) { ex.printStackTrace(); } } public final String getRemoteMacAddr() throws Exception { byte[] bqcmd = getQueryCmd(); this.send(bqcmd); DatagramPacket dp = receive(); String smac =""; smac = getMacAddr(dp.getData()); this.close(); return smac; } public static void main(String[] args) throws Exception { UdpGetClientMacAddr add = new UdpGetClientMacAddr("123.123.123.8"); System.out.println(add.getRemoteMacAddr()); }}
来源地址:https://blog.csdn.net/weixin_44975322/article/details/129442333