IPUtils

import com.yundaex.common.validation.asserts.YDAssert;
import com.yundaex.common.validation.asserts.YDIllegalArgumentException;

public class IPUtils {

    /***
     * 校验IP段是否一致
     * IP段的前三部分必须一直, 比如222.72.45.0-222.72.45.255, 不能是222.72.45.0 - 110.72.45.255
     * @param startSection
     * @param endSection
     * @return
     */
    public static boolean verifyIPSectionMeet(String startSection, String endSection){
        boolean startIpMeet = verifyIPMeet(startSection);
        if (!startIpMeet){
            throw new YDIllegalArgumentException("开始段IP不合法。");
        }
        boolean endIpMeet = verifyIPMeet(endSection);
        if (!endIpMeet){
            throw new YDIllegalArgumentException("结束段IP不合法。");
        }
        if (startIpMeet && endIpMeet){
            String startIpPrefix = startSection.substring(0, startSection.lastIndexOf(".") + 1);
            String endIpPrefix = endSection.substring(0, startSection.lastIndexOf(".") + 1);
            if (startIpPrefix.equals(endIpPrefix)){
                return true;
            }
        }
        return false;
    }
    
    /***
     * 校验IP是否合法
     * @param ip
     * @return
     */
    public static boolean verifyIPMeet(String ip){
        YDAssert.isNotNull(ip, "IP不能为空。");
         // 定义正则表达式
        String regex = "^(1\d{2}|2[0-4]\d|25[0-5]|[1-9]\d|[1-9])\."
                + "(1\d{2}|2[0-4]\d|25[0-5]|[1-9]\d|\d)\."
                + "(1\d{2}|2[0-4]\d|25[0-5]|[1-9]\d|\d)\."
                + "(1\d{2}|2[0-4]\d|25[0-5]|[1-9]\d|\d)$";
        // 判断ip地址是否与正则表达式匹配
        if (ip.matches(regex)) {
            // 返回判断信息
            return true;
        }
        return false;
    }
}

private void checkIpMeet(String ipAddress){
        if ("0.0.0.0".equalsIgnoreCase(ipAddress)){
            return;
        }
        boolean ipIsVerifyflag =  IPUtils.verifyIPMeet(ipAddress);
        if (!ipIsVerifyflag){
            throw new YDIllegalArgumentException("IP配置出错，IP不合法：" + ipAddress);
        }
    }

package me.zhengjie.common.utils;

import javax.servlet.http.HttpServletRequest;

/**
 * 获取ip地址
 * @author X-rapido
 * @date 2018-11-24
 */
public class IpUtil {
    public static String getIP(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.getRemoteAddr();
        }
        return "0:0:0:0:0:0:0:1".equals(ip)?"127.0.0.1":ip;
    }
}

package org.linlinjava.litemall.core.util;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * IP地址相关工具类
 */
public class IpUtil {

    private static final Log logger = LogFactory.getLog(IpUtil.class);

    public static String getIpAddr(HttpServletRequest request) {
        String ipAddress;
        try {
            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")) {
                    // 根据网卡取本机配置的IP
                    InetAddress inet = null;
                    try {
                        inet = InetAddress.getLocalHost();
                    } catch (UnknownHostException e) {
                        logger.error(e.getMessage(), e);
                    }
                    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(","));
                }
            }
        } catch (Exception e) {
            ipAddress = "";
        }

        return ipAddress;
    }
}