content: package com.company.project.common.utils;
  
  import org.apache.commons.lang.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.servlet.http.HttpServletRequest;
  import java.net.InetAddress;
  import java.net.UnknownHostException;
  
  /**
   * IPUtils
   *
   * @author wenbin
   * @version V1.0
   * @date 2020年3月18日
   */
  public class IPUtils {
  
      private static Logger logger = LoggerFactory.getLogger(IPUtils.class);
  
      /**
       * 获取IP地址
       * <p>
       * 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
       * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
       */
      public static String getIpAddr(HttpServletRequest request) {
          String ip = null;
          try {
              ip = request.getHeader("x-forwarded-for");
              if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                  ip = request.getHeader("Proxy-Client-IP");
              }
              if (StringUtils.isEmpty(ip) || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                  ip = request.getHeader("WL-Proxy-Client-IP");
              }
              if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                  ip = request.getHeader("HTTP_CLIENT_IP");
              }
              if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                  ip = request.getHeader("HTTP_X_FORWARDED_FOR");
              }
              if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                  ip = request.getRemoteAddr();
              }
          } catch (Exception e) {
              logger.error("IPUtils ERROR ", e);
          }
  
          // 使用代理，则获取第一个IP地址
          if (!StringUtils.isEmpty(ip) && ip.length() > 15) {
              if (ip.indexOf(",") > 0) {
                  ip = ip.substring(0, ip.indexOf(","));
              }
          }
  
          return ip;
      }
  
      /**
       * 获取客户端主机名称
       */
      public static String getHostName() {
          try {
              return InetAddress.getLocalHost().getHostName();
          } catch (UnknownHostException e) {
              logger.error(e.getMessage(), e);
          }
          return "未知";
      }
  
  }
  