Java利用Request请求获取IP地址的方法详解

public class IpAdrressUtil {
 /**
  * 获取Ip地址
  * @param request
  * @return
  */
 private static String getIpAdrress(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;
 }
}

X-Forwarded-For: client, proxy1, proxy2，proxy…