Example sharing of Java obtaining client IP address and MAC address

This article mainly introduces how JAVA obtains the client IP address and MAC address, which is very practical. The detailed code is compiled here. Friends in need can refer to it

This article introduces how JAVA obtains customers The client IP address and MAC address are shared with everyone, as follows:

1. Obtain the client IP address

public String getIp(HttpServletRequest request) throws Exception {
  String ip = request.getHeader("X-Forwarded-For");
  if (ip != null) {
    if (!ip.isEmpty() && !"unKnown".equalsIgnoreCase(ip)) {
      int index = ip.indexOf(",");
      if (index != -1) {
        return ip.substring(0, index);
      } else {
        return ip;
      }
    }
  }
  ip = request.getHeader("X-Real-IP");
  if (ip != null) {
    if (!ip.isEmpty() && !"unKnown".equalsIgnoreCase(ip)) {
      return ip;
    }
  }
  return request.getRemoteAddr();
}

Why not use request.getRemoteAddr() directly; instead, judge the two request headers "X-Forwarded-For" and "X-Real-IP" beforehand

X-Forwarded-For: client1, proxy1, proxy2, proxy3

The values ​​are separated by a comma + space to separate multiple IP addresses. The leftmost (client1) is the IP address of the original client. Each time the proxy server successfully receives a request, Add the request source IP address to the right.

We only take the first IP address

:0:0:0:0:0:0:1 Question

public String getIp(HttpServletRequest request) throws Exception {
  String ip = request.getHeader("X-Forwarded-For");
  if (ip != null) {
    if (!ip.isEmpty() && !"unKnown".equalsIgnoreCase(ip)) {
      int index = ip.indexOf(",");
      if (index != -1) {
        return ip.substring(0, index);
      } else {
        return ip;
      }
    }
  }
  ip = request.getHeader("X-Real-IP");
  if (ip != null) {
    if (!ip.isEmpty() && !"unKnown".equalsIgnoreCase(ip)) {
      return ip;
    }
  }
  ip = request.getHeader("Proxy-Client-IP");
  if (ip != null) {
    if (!ip.isEmpty() && !"unKnown".equalsIgnoreCase(ip)) {
      return ip;
    }
  }
  ip = request.getHeader("WL-Proxy-Client-IP");
  if (ip != null) {
    if (!ip.isEmpty() && !"unKnown".equalsIgnoreCase(ip)) {
      return ip;
    }
  }
  ip = request.getRemoteAddr();
  return ip.equals("0:0:0:0:0:0:0:1") ? "127.0.0.1" : ip;
}

UdpGetClientMacAddr umac = new UdpGetClientMacAddr(sip);
String smac = umac.GetRemoteMacAddr();

final UdpGetClientMacAddr umac = new UdpGetClientMacAddr(sip);
//---长时间获取不到MAC地址则放弃
ExecutorService exec = Executors.newFixedThreadPool(1);
Callable call = new Callable() {
  public String call() throws Exception {
    return umac.GetRemoteMacAddr();
  }
};
try {
  Future future = exec.submit(call);
  String smac = future.get(1000 * 1, TimeUnit.MILLISECONDS);
  loginMonitor.setMacAddress(smac);
} catch (TimeoutException ex) {
  loginMonitor.setMacAddress("获取失败");
  logger.info("获取MAC地址超时");
  ex.printStackTrace();
}
// 关闭线程池 
exec.shutdown();
//---

UdpGetClientMacAddr.java

package shmc.commonsys.security.controller;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
 
/** 
 * 主机A向主机B发送“UDP－NetBIOS－NS”询问包，即向主机B的137端口，发Query包来询问主机B的NetBIOS Names信息。 
 * 其次，主机B接收到“UDP－NetBIOS－NS”询问包，假设主机B正确安装了NetBIOS服务........... 而且137端口开放，则主机B会向主机A发送一个“UDP－NetBIOS－NS”应答包，即发Answer包给主机A。 
 * 并利用UDP(NetBIOS Name Service)来快速获取远程主机MAC地址的方法 
 * 
 */ 
public class UdpGetClientMacAddr { 
  private String sRemoteAddr; 
  private int iRemotePort=137; 
  private byte[] buffer = new byte[1024]; 
  private DatagramSocket ds=null; 
 
  public UdpGetClientMacAddr(String strAddr) throws Exception{ 
    sRemoteAddr = strAddr; 
    ds = new DatagramSocket(); 
  } 
 
  public final DatagramPacket send(final byte[] bytes) throws IOException { 
    DatagramPacket dp = new DatagramPacket(bytes,bytes.length,InetAddress.getByName(sRemoteAddr),iRemotePort); 
    ds.send(dp); 
    return dp; 
  } 
 
  public final DatagramPacket receive() throws Exception { 
    DatagramPacket dp = new DatagramPacket(buffer,buffer.length); 
    ds.receive(dp); 
    return dp; 
  } 
  public 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; 
  } 
  public final String GetMacAddr(byte[] brevdata) throws Exception { 
    // 获取计算机名 
    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() throws Exception { 
    ds.close(); 
  } 
 
  public final String GetRemoteMacAddr() throws Exception { 
    byte[] bqcmd = GetQueryCmd(); 
    send(bqcmd); 
    DatagramPacket dp = receive(); 
    String smac = GetMacAddr(dp.getData()); 
    close(); 
 
    return smac; 
  } 
   
  public static void main(String args[]) throws Exception{ 
    UdpGetClientMacAddr umac=new UdpGetClientMacAddr("172.19.1.198"); 
    umac=new UdpGetClientMacAddr("192.168.16.83"); 
    System.out.println(umac.GetRemoteMacAddr()); 
  } 
}

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