JAVA获取客户端IP地址和MAC地址

本文转载：https://www.cnblogs.com/huangjian2/p/6238236.html

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();
}

为什么不直接使用request.getRemoteAddr()；而要在之前判断两个请求头"X-Forwarded-For"和"X-Real-IP"

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

其中的值通过一个 逗号+空格 把多个IP地址区分开, 最左边(client1)是最原始客户端的IP地址, 代理服务器每成功收到一个请求，就把请求来源IP地址添加到右边。

所有我们只取第一个IP地址

X-Real-IP，一般只记录真实发出请求的客户端IP

解决用localhost访问ip为0:0:0:0:0:0:0:1的问题

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;
}

2.获取客户端MAC地址

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

添加一个获取MAC的时间限制

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<String> call = new Callable<String>() {
public String call() throws Exception {
return umac.GetRemoteMacAddr();
}
};
try {
Future<String> 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();

需要先获取IP地址作为参数构造一个UdpGetClientMacAddr

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;
a37f

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());
}
}