import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;

/**
 * @version v1.0
 * @Description: TODO
 * @Author: cnb
 * @Date: 2020/1/18 23:08
 */
public class IpUtils {

    private static final String[] HEADERS = {
            "X-Forwarded-For",
            "Proxy-Client-IP",
            "WL-Proxy-Client-IP",
            "HTTP_X_FORWARDED_FOR",
            "HTTP_X_FORWARDED",
            "HTTP_X_CLUSTER_CLIENT_IP",
            "HTTP_CLIENT_IP",
            "HTTP_FORWARDED_FOR",
            "HTTP_FORWARDED",
            "HTTP_VIA",
            "REMOTE_ADDR",
            "X-Real-IP"
    };

    /**
     * 判断ip是否为空，空返回true
     * @param ip
     * @return
     */
    public static boolean isEmptyIp(final String ip){
        return (ip == null || ip.length() == 0 || ip.trim().equals("") || "unknown".equalsIgnoreCase(ip));
    }


    /**
     * 判断ip是否不为空，不为空返回true
     * @param ip
     * @return
     */
    public static boolean isNotEmptyIp(final String ip){
        return !isEmptyIp(ip);
    }

    /***
     * 获取客户端ip地址(可以穿透代理)
     * @param request HttpServletRequest
     * @return
     */
    public static String getIpAddress(HttpServletRequest request) {
        String ip = "";
        for (String header : HEADERS) {
            ip = request.getHeader(header);
            if(isNotEmptyIp(ip)) {
                break;
            }
        }
        if(isEmptyIp(ip)){
            ip = request.getRemoteAddr();
        }
        if(isNotEmptyIp(ip) && ip.contains(",")){
            ip = ip.split(",")[0];
        }
        if("0:0:0:0:0:0:0:1".equals(ip)){
            ip = "127.0.0.1";
        }
        return ip;
    }


    /**
     * 获取本机的局域网ip地址，兼容Linux
     * @return String
     * @throws Exception
     */
    public String getLocalHostIP() throws Exception{
        Enumeration<NetworkInterface> allNetInterfaces = NetworkInterface.getNetworkInterfaces();
        String localHostAddress = "";
        while(allNetInterfaces.hasMoreElements()){
            NetworkInterface networkInterface = allNetInterfaces.nextElement();
            Enumeration<InetAddress> address = networkInterface.getInetAddresses();
            while(address.hasMoreElements()){
                InetAddress inetAddress = address.nextElement();
                if(inetAddress != null && inetAddress instanceof Inet4Address){
                    localHostAddress = inetAddress.getHostAddress();
                }
            }
        }
        return localHostAddress;
    }
    
}



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Java获取ip地址
package com.sinosoft.ireport;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Enumeration;
import javax.servlet.http.HttpServletRequest;


/**
 * @program: Report
 * @description: 获取IP地址
 * @author: XWJ
 * @create: 2021-04-14 21:03
 **/
public class WebToolUtils {

    /**
     * 获取本地IP地址
     *
     * @throws SocketException
     */
    public static String getLocalIP() throws UnknownHostException, SocketException {
        if (isWindowsOS()) {
            return InetAddress.getLocalHost().getHostAddress();
        } else {
            return getLinuxLocalIp();
        }
    }

    /**
     * 判断操作系统是否是Windows
     *
     * @return
     */
    public static boolean isWindowsOS() {
        boolean isWindowsOS = false;
        String osName = System.getProperty("os.name");
        if (osName.toLowerCase().indexOf("windows") > -1) {
            isWindowsOS = true;
        }
        return isWindowsOS;
    }

    /**
     * 获取本地Host名称
     */
    public static String getLocalHostName() throws UnknownHostException {
        return InetAddress.getLocalHost().getHostName();
    }

    /**
     * 获取Linux下的IP地址
     *
     * @return IP地址
     * @throws SocketException
     */
    private static String getLinuxLocalIp() throws SocketException {
        String ip = "";
        try {
            for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements(); ) {
                NetworkInterface intf = en.nextElement();
                String name = intf.getName();
                if (!name.contains("docker") && !name.contains("lo")) {
                    for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements(); ) {
                        InetAddress inetAddress = enumIpAddr.nextElement();
                        if (!inetAddress.isLoopbackAddress()) {
                            String ipaddress = inetAddress.getHostAddress().toString();
                            if (!ipaddress.contains("::") && !ipaddress.contains("0:0:") && !ipaddress.contains("fe80")) {
                                ip = ipaddress;
                                System.out.println(ipaddress);
                            }
                        }
                    }
                }
            }
        } catch (SocketException ex) {
            System.out.println("获取ip地址异常");
            ip = "127.0.0.1";
            ex.printStackTrace();
        }
        System.out.println("IP:" + ip);
        return ip;
    }

    /**
     * 获取用户真实IP地址，不使用request.getRemoteAddr();的原因是有可能用户使用了代理软件方式避免真实IP地址,
     * <p>
     * 可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值，究竟哪个才是真正的用户端的真实IP呢？
     * 答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。
     * <p>
     * 如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130,
     * 192.168.1.100
     * <p>
     * 用户真实IP为： 192.168.1.110
     *
     * @param request
     * @return
     */
    public static String getIpAddress(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }

}

public static String serverIp = null;
static {
    //获取服务器的IP地址
    InetAddress address = getCurrentIp();
    serverIp = address.getHostAddress();
}


public static InetAddress getCurrentIp() {
    try {
        Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
        while (networkInterfaces.hasMoreElements()) {
            NetworkInterface ni = (NetworkInterface) networkInterfaces.nextElement();
            Enumeration<InetAddress> nias = ni.getInetAddresses();
            while (nias.hasMoreElements()) {
                InetAddress ia = (InetAddress) nias.nextElement();
                if (!ia.isLinkLocalAddress() && !ia.isLoopbackAddress() && ia instanceof Inet4Address) {
                    return ia;
                }
            }
        }
    } catch (SocketException e) {
        log.info("获取服务器IP地址有误:{}",e.getStackTrace());
    }
    return null;
}

 

测试：

System.out.println(serverIp);

package util;

import java.net.InetAddress;
import java.net.UnknownHostException;

import javax.servlet.http.HttpServletRequest;

public class CusAccessObjectUtil {  

    /** 
     * 获取用户真实IP地址，不使用request.getRemoteAddr();的原因是有可能用户使用了代理软件方式避免真实IP地址, 
     * 参考文章： http://developer.51cto.com/art/201111/305181.htm 
     *  
     * 可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值，究竟哪个才是真正的用户端的真实IP呢？ 
     * 答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。 
     *  
     * 如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130, 
     * 192.168.1.100 
     *  
     * 用户真实IP为： 192.168.1.110 
     *  
     * @param request 
     * @return 
     */  
    public static String getIpAddress(HttpServletRequest request) {  
    	  String ipAddress = request.getHeader("x-forwarded-for");  
          if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {  
              ipAddress = request.getHeader("Proxy-Client-IP");  
          }  
          if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {  
              ipAddress = request.getHeader("WL-Proxy-Client-IP");  
          }  
          if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {  
              ipAddress = request.getRemoteAddr();  
              if(ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")){  
                  //根据网卡取本机配置的IP  
                  InetAddress inet=null;  
                  try {  
                      inet = InetAddress.getLocalHost();  
                  } catch (UnknownHostException e) {  
                      e.printStackTrace();  
                  }  
                  ipAddress= inet.getHostAddress();  
              }  
          }  
          //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割  
          if(ipAddress!=null && ipAddress.length()>15){ //"***.***.***.***".length() = 15  
              if(ipAddress.indexOf(",")>0){  
                  ipAddress = ipAddress.substring(0,ipAddress.indexOf(","));  
              }  
          }  
          return ipAddress;   
    }  


    public static String getLocalIP() throws UnknownHostException {  
    	  String localIP = "";  
    	  InetAddress addr = (InetAddress) InetAddress.getLocalHost();  

    	  localIP = addr.getHostAddress().toString();  
    	  return localIP;  
    	  }  


}
转载于:https://www.cnblogs.com/nomengfei/p/10754746.html