content: package com.gitee.pifeng.monitoring.common.web.util;
  
  import lombok.extern.slf4j.Slf4j;
  
  import javax.servlet.http.HttpServletRequest;
  import java.net.InetAddress;
  import java.net.UnknownHostException;
  
  /**
   * <p>
   * 访问对象工具类
   * </p>
   *
   * @author 皮锋
   * @custom.date 2021/6/10 14:04
   */
  @Slf4j
  public class AccessObjectUtils {
  
      /**
       * <p>
       * 获取客户端真实IP地址
       * </p>
       * 获取客户端真实IP地址，不使用request.getRemoteAddr();的原因是有可能客户端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，究竟哪个才是客户端的真实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
       * 客户端真实IP为： 192.168.1.110
       *
       * @param request 请求对象
       * @return IP地址
       * @author 皮锋
       * @custom.date 2021/6/10 14:07
       */
      public static String getClientAddress(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 ("127.0.0.1".equals(ipAddress) || "0:0:0:0:0:0:0:1".equals(ipAddress)) {
                  //根据网卡取本机配置的IP
                  InetAddress inet;
                  try {
                      inet = InetAddress.getLocalHost();
                      ipAddress = inet.getHostAddress();
                  } catch (UnknownHostException e) {
                      log.error(e.getMessage());
                  }
              }
          }
          //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) {
              if (ipAddress.indexOf(",") > 0) {
                  ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
              }
          }
          return ipAddress;
      }
  
  }
  