前言

有时候我们需要调用别人的接口，需要对自己的真实ip加入白名单才能调通，但是请求发出后会经过层层代理，导致我们不知道自己请求的真实ip，下面这个方法可以拿到

package com.sinosoft.springbootplus.lft.business.dispatch.grid.controller;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;public class test {private static final Logger logger = LoggerFactory.getLogger(test.class);private static final String localIp = "127.0.0.1";/*** 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,* 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** @return ip*/public static String getIpAddress(HttpServletRequest request) {String ipAddress;try {ipAddress = request.getHeader("x-forwarded-for");if (ipAddress != null && ipAddress.length() != 0 && !"unknown".equalsIgnoreCase(ipAddress)) {// 多次反向代理后会有多个ip值，第一个ip才是真实ipif (ipAddress.indexOf(",") != -1) {ipAddress = ipAddress.split(",")[0];logger.info("多次反向代理后 ip: " + ipAddress);}}if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {ipAddress = request.getHeader("Proxy-Client-IP");logger.info("Proxy-Client-IP ip: " + ipAddress);}if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {ipAddress = request.getHeader("WL-Proxy-Client-IP");logger.info("WL-Proxy-Client-IP ip: " + ipAddress);}if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {ipAddress = request.getHeader("HTTP_CLIENT_IP");logger.info("HTTP_CLIENT_IP ip: " + ipAddress);}if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {ipAddress = request.getHeader("HTTP_X_FORWARDED_FOR");logger.info("HTTP_X_FORWARDED_FOR ip: " + ipAddress);}if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {ipAddress = request.getHeader("X-Real-IP");logger.info("X-Real-IP ip: " + ipAddress);}if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {ipAddress = request.getRemoteAddr();if (localIp.equals(ipAddress)) {// 根据网卡取本机配置的IPInetAddress inet = null;try {inet = InetAddress.getLocalHost();} catch (UnknownHostException e) {e.printStackTrace();}assert inet != null;ipAddress = inet.getHostAddress();logger.info("根据网卡取本机配置 ip: " + ipAddress);}}// 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) {// = 15if (ipAddress.indexOf(",") > 0) {ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));logger.info("多次反向代理后 ip: " + ipAddress);}}} catch (Exception e) {ipAddress = "";}logger.info("IP地址信息：" + ipAddress);return "0:0:0:0:0:0:0:1".equals(ipAddress) ? localIp : ipAddress;}
}