Nginx 反向代理获取设备真实的IP地址

package com.das.common.util;

import org.apache.commons.lang3.StringUtils;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

/**
 * @Author lime
 * @Date 2018/1/31
 */
public class IpUtil {

    public static String getIpAddress(HttpServletRequest request) {
        String xIp = request.getHeader("X-Real-IP");
        String xFor = request.getHeader("X-Forwarded-For");
        if(StringUtils.isNotEmpty(xFor) && !"unKnown".equalsIgnoreCase(xFor)){
            //多次反向代理后会有多个ip值，第一个ip才是真实ip
            int index = xFor.indexOf(",");
            if(index != -1){
                return xFor.substring(0,index);
            }else{
                return xFor;
            }
        }
        xFor = xIp;
        if(StringUtils.isNotEmpty(xFor) && !"unKnown".equalsIgnoreCase(xFor)){
            return xFor;
        }
        if (StringUtils.isBlank(xFor) || "unknown".equalsIgnoreCase(xFor)) {
            xFor = request.getHeader("Proxy-Client-IP");
        }
        if (StringUtils.isBlank(xFor) || "unknown".equalsIgnoreCase(xFor)) {
            xFor = request.getHeader("WL-Proxy-Client-IP");
        }
        if (StringUtils.isBlank(xFor) || "unknown".equalsIgnoreCase(xFor)) {
            xFor = request.getHeader("HTTP_CLIENT_IP");
        }
        if (StringUtils.isBlank(xFor) || "unknown".equalsIgnoreCase(xFor)) {
            xFor = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (StringUtils.isBlank(xFor) || "unknown".equalsIgnoreCase(xFor)) {
            xFor = request.getRemoteAddr();
        }
        return xFor;
    }

    public static String getIpAddress() {
        HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
        return getIpAddress(request);
    }
}