content: package me.flyray.rbac.utils;
  
  import com.alibaba.druid.util.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.servlet.http.HttpServletRequest;
  
  /**
   * IP地址
   * 
   * @author chenshun
   * @email sunlightcs@gmail.com
   * @date 2017年3月8日 下午12:57:02
   */
  public class IPUtils {
  	private static Logger logger = LoggerFactory.getLogger(IPUtils.class);
  
  	/**
  	 * 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) {
          	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;
      }
  	
  }
  