Java获取ip地址

package utils;

import com.alibaba.druid.util.StringUtils;
import javax.servlet.http.HttpServletRequest;

/**
 * IP地址
 * 
 * @author zengwei
 * @email 15797630391@163.com
 * @date 2018-03-23 22:02
 */
public class IPUtils {

  /**
   * 获取IP地址
   * 
   * 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) {

    }
    return ip;
  }

}