request获取客户端IP地址

最新推荐文章于 2023-06-16 14:38:34 发布

fairyhawk

最新推荐文章于 2023-06-16 14:38:34 发布

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文章标签： null string

本文介绍了一种在Java中通过HttpServletRequest对象获取客户端真实IP地址的方法。该方法依次尝试从多种Header中读取IP地址，包括'x-forwarded-for'、'Proxy-Client-IP'、'WL-Proxy-Client-IP'等，并最终使用getRemoteAddr()方法作为兜底方案。对于存在多级代理的情况，还提供了解决方案。

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 public String getIpAddr(HttpServletRequest request) {
  String ip = request.getHeader("x-forwarded-for");
  if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
   ip = request.getHeader("Proxy-Client-IP");
  }
  if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
   ip = request.getHeader("WL-Proxy-Client-IP");
  }
  if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
   ip = request.getRemoteAddr();
  }
  if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
   ip = request.getHeader("http_client_ip");
  }
  if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
   ip = request.getHeader("HTTP_X_FORWARDED_FOR");
  }
  // 如果是多级代理，那么取第一个ip为客户ip
  if (ip != null && ip.indexOf(",") != -1) {
   ip = ip.substring(ip.lastIndexOf(",") + 1, ip.length()).trim();
  }
  return ip;
 }